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WO2018130403A1 - Système d'éclairage qui maintient la dose mélanopique pendant une gradation ou un réglage de couleur - Google Patents

Système d'éclairage qui maintient la dose mélanopique pendant une gradation ou un réglage de couleur Download PDF

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Publication number
WO2018130403A1
WO2018130403A1 PCT/EP2017/084188 EP2017084188W WO2018130403A1 WO 2018130403 A1 WO2018130403 A1 WO 2018130403A1 EP 2017084188 W EP2017084188 W EP 2017084188W WO 2018130403 A1 WO2018130403 A1 WO 2018130403A1
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WO
WIPO (PCT)
Prior art keywords
light
lighting
melanopic
value
lighting property
Prior art date
Application number
PCT/EP2017/084188
Other languages
English (en)
Inventor
Lucas Josef Maria Schlangen
Tobias BORRA
Jan Souman
Marcel LUCASSEN
Original Assignee
Philips Lighting Holding B.V.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Philips Lighting Holding B.V. filed Critical Philips Lighting Holding B.V.
Publication of WO2018130403A1 publication Critical patent/WO2018130403A1/fr

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
    • A61N5/00—Radiation therapy
    • A61N5/06—Radiation therapy using light
    • A61N5/0613—Apparatus adapted for a specific treatment
    • A61N5/0618—Psychological treatment
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/20—Controlling the colour of the light
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/10—Controlling the light source
    • H05B47/105—Controlling the light source in response to determined parameters
    • H05B47/11—Controlling the light source in response to determined parameters by determining the brightness or colour temperature of ambient light
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
    • A61N5/00—Radiation therapy
    • A61N5/06—Radiation therapy using light
    • A61N2005/0626—Monitoring, verifying, controlling systems and methods
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection

Definitions

  • Lighting system that maintains the melanopic dose during dimming or color tuning
  • the invention relates to a lighting system.
  • the invention further relates to a method of controlling light, especially of such lighting system, and to a computer program product.
  • US2015/0195885 describes a light emitting apparatus comprising a first LED component, a second LED component, and a control device, wherein the control device is arranged to operate the first LED component and the second LED component in a first operating mode in which combined emissions of the first LED component and the second LED component (i) are within six MacAdam ellipses of a target correlated color temperature, and (ii) embody a first melatonin suppression milliwatt per hundred lumens value, wherein the control device is arranged to operate the first LED component and the second LED component in a second operating mode in which combined emissions of the first LED component and the second LED component (i) are within six MacAdam ellipses of the target correlated color temperature, and (ii) embody a second melatonin suppression milliwatt per hundred lumens value that is at least about 10 percent greater than the first melatonin suppression milliwatt per hundred lumens value, and where
  • melatonin a hormone that promotes sleep during night time.
  • Melatonin is a sleep supportive hormone that we only produce around (and during) our usual bedtime.
  • Light exposure during the evening and at night suppresses the natural production of melatonin.
  • CCT correlated color temperature
  • intensity energizes people making them awake and alert.
  • Current high performance LED based lighting apparatus with tunable CCT are able to mimic different phases of daylight, i.e., changes in spectral power distribution and variations in CCT, to a certain extent.
  • Fig. 1 The relative spectral sensitivity for the classic receptors (rods and cones) and for the melanopic receptors are provided in Fig. 1 (see also R.J. Lucas, et al., Measuring and using light in the melanopsin age, Trends in Neurosciences, Vol. 37, No. 1, January 2014, pp. 1-9;
  • a nocturnal light exposure will result in a stronger melatonin suppression.
  • a light exposure can be said to be more biologically active and more alerting when the power in the melanopic sensitive wavelength range (and the ability to suppress melatonin at night) is increased.
  • the effectiveness of a given light spectrum in suppressing melatonin production can be expressed in terms of the melanopsin effectiveness factor (MEF). This factor is calculated by
  • the above indicated summations are over the visible wavelength range of 380-780 nm.
  • the MEF for an equi-energy light source MEFEE equals 1.
  • an equi-energy light source has constant radiant energy at all visible wavelengths i.e. SPD(X) is a constant (for instance 1) for all visible wavelengths.
  • the luminous (radiant) flux ( ⁇ ⁇ , expressed in lumen) is defined as:
  • Km equals 683 lm/W and ⁇ ( ⁇ ) equals the photopic sensitivity function.
  • Km is also referred to as the maximum luminous efficacy and ⁇ ( ⁇ ) as the photopic luminous efficiency function.
  • the melanopic flux or melanopic radiant flux defined as can be calculated from the luminous flux or luminous
  • the melanopic irradiance (E me i) is defined as the melanopic radiant flux per unit area (A) and can be calculated according to where E v represents the illuminance ( ⁇ ⁇ / A) expressed in photopic lux.
  • m ⁇ X represents the melanopic sensitivity function but now normalized according to
  • an equi-energy light source producing an (photopic) illuminance of 1 (photopic) lux, i.e. 1 (photopic) lumen on an area of 1 m 2 is said to produce a
  • the E z value (expressed in melanopic lux) of a test light condition t with a MEF value of MEFt and an illuminance of E v can be calculated from Emei (as defined in Eq. 6) according to
  • the melanopic (radiant) flux ⁇ ⁇ (expressed in melanopic lumen) of a test light condition t with an MEF value of MEFt and a luminous flux of ⁇ ⁇ can be calculated from (as defined in Eq. 5) according to
  • LED based lighting systems may allow users to adjust color temperature and light intensity according to their preferences.
  • a problem is that, in general, such personalization will lead to a change (lower or higher) in melanopic stimulation, which is not always desired.
  • users may desire to adapt the melanopic (radiant) flux of light as function of e.g. desired activity or time of the day, but the light generally associated with the desired melanopic flux may not fit with the desired type of light for the activity or time of day (e.g. too cool or too warm).
  • the present disclosure provides an alternative lighting system, which preferably further at least partly obviates one or more of above-described drawbacks. .
  • a lighting system comprises a lighting device (“device”) configured to provide light (“lighting device light”), wherein one or more lighting properties, including the spectral power distribution, of the light are controllable, wherein the lighting system further comprises a control system (“controller”) adapted to provide at least a controlling mode which comprises maintaining a predetermined melanopic flux value (and/or another non-visual parameter) of the light while allowing another (visual) lighting property of the light to be changed from a first lighting property value to a second lighting property value.
  • a controlling mode which comprises maintaining a predetermined melanopic flux value (and/or another non-visual parameter) of the light while allowing another (visual) lighting property of the light to be changed from a first lighting property value to a second lighting property value.
  • the disclosed apparatus or method allows maintaining the melanopic flux value at a desired or preset level, while tuning one or more other lighting properties, e.g. in conformance with personal preferences or in conformance with lighting of surrounding spaces.
  • the disclosed apparatus or method also allows lamps to be used in different regions of the world where preferred color points or color temperatures may differ between regions and wherein nonetheless essentially the same melanopic flux value may be desirable during for example working conditions or reading conditions.
  • the prior art such as US2015/0195885
  • the disclosed apparatus and method therefore addresses an essentially different problem.
  • lighting properties that affect the visual effects (e.g. brightness, color) of light may be adapted, without essentially
  • non-visual effects e.g. melatonin production or alertness
  • a lighting system comprising a lighting device configured to provide light, wherein one or more lighting properties, including the spectral power distribution, of the light are controllable, wherein the lighting system further comprises a control system adapted to provide at least a controlling mode which comprises maintaining a predetermined value for a non-visual effect of the light, where the value of the non- visual effect may in embodiments be approximated by a melanopic flux value, while allowing another lighting property of the light to be changed from a first lighting property value to a second lighting property value.
  • a lighting system comprising a lighting device configured to provide light, wherein one or more lighting properties, including the spectral power distribution, of the light are controllable, wherein the lighting system further comprises a control system adapted to provide at least a controlling mode which comprises maintaining a predetermined melanopic illuminance (i.e. melanopic lux level) of the light at a certain position while allowing another lighting property of the light to be changed from a first lighting property value to a second lighting property value.
  • the position may be the location of a user's eye or the location of a visual task.
  • the non- visual effect may also be approximated in other ways. For instance, an approximation may be based on one of the five Alpha-opic fluxes (as defined in Lucas et al. 2014) or on a combination of at least two of the five Alpha-opic fluxes. Yet, in other embodiments the non- visual effect may be approximated by an alternative quantity such as the circadian stimulus CLa and Cs as defined in Bellia L, Pedace A, Barbato G. Indoor artificial lighting: Prediction of the circadian impact of different spectral power distributions. Lighting Research and Technology, 2013, or Rea, M. S., Figueiro, M. G., Bierman, A., & Bullough, J. D. (2010). Circadian light. Journal of Circadian Rhythms, 8(1), 2. Instead of the melanopic flux also the melanopic irradiance or the melanopic illuminance can be used.
  • the present disclosure also provides a lighting system comprising a lighting device configured to provide light, wherein one or more lighting properties, including the spectral power distribution, of the light are controllable, wherein the lighting system further comprises a control system adapted to provide at least a controlling mode which comprises maintaining a predetermined melanopic illuminance value of the light while allowing another lighting property of the light to be changed from a first lighting property value to a second lighting property value.
  • the disclosed apparatus, systems and methods are further defined in relation to the melanopic flux.
  • the term “melanopic flux” may also be replaced by “melanopic irradiance” or “melanopic illuminance” or “melanopic luminance”.
  • the term “luminous flux” may also be replaced by "luminous irradiance” or “luminous illuminance” or “melanopic luminance”.
  • embodiments may also be formulated as a lighting system comprising a lighting device configured to provide light, wherein one or more lighting properties, including the spectral power distribution, of the light are controllable, wherein the lighting system further comprises a control system adapted to provide at least a controlling mode which comprises maintaining a predetermined non- visual effect of the light, where the non- visual effect may in embodiments relate to the melanopic flux value, while allowing another lighting property of the light to be changed from a first lighting property value to a second lighting property value.
  • the phrase "relates to" in this context may also refer to scaling with.
  • the lighting system comprises a lighting device configured to provide light.
  • the term “lighting device” may refer to one or more lighting devices.
  • the term “lighting device” may refer to one or more light sources.
  • a “light source” may be a solid state light source, such as a laser light source, an organic or inorganic light emitting diode (LED), etc.
  • the terms “light source” or “lighting device” may also relate to a plurality of light sources, such as e.g. 2-200 light sources.
  • the term LED may also refer to a plurality of LEDs.
  • the terms “light source” or “lighting device” may in embodiments also refer to a so-called chips-on-board (COB) light source.
  • COB chips-on-board
  • COB especially refers to LED chips in the form of a semiconductor chip that is neither encased nor connected but directly mounted onto a substrate, such as a PCB. Hence, a plurality of semiconductor light sources may be configured on the same substrate.
  • a COB is a multi LED chip configured together as a single lighting module.
  • the light generated during use of the apparatus is indicated as light or lighting device light.
  • the lighting device light may comprise light of one or more light sources and/or one or more lighting devices.
  • the lighting device is adapted to provide lighting device light that has tunable lighting properties. Lighting properties that are tunable may especially be selected from the group consisting of spectral power distribution of the light, correlated color temperature (CCT), color point, relative gamut area index, and intensity of the light.
  • CCT correlated color temperature
  • the phrase "allowing to be changed from a first lighting property value to a second lighting property value” and similar phrases may related to a change in correlated color temperature of at least 5 K, such as at least 10 K, like in the range of 5-3000 K, such as especially in the range of 10-2000 K, like in the range of 20-1500 K, like in the order of about 50-1250 K, e.g. 50-1000 K, or up to 500 K.
  • the phrase "allowing to be changed from a first lighting property value to a second lighting property value” and similar phrases may related to a change in x- value and/or y-value (CIE 1931) of in the range of at least 0.01, like at least 0.02, such as at least 0.04, like in the range of 0.01-0.25, such as 0.02-0.2, like in the range of 0.02-0.15, like in the range of 0.02-0.1.
  • CIE 1931 y-value
  • the phrase "allowing to be changed from a first lighting property value to a second lighting property value” and similar phrases may related to a change in intensity of 0.1-50% of the maximum intensity.
  • Light intensity relates to or scales with operating power of the lighting device or light source. Changes in intensity may therefore be expressed as changes from e.g. 40 Watt (maximum power) to 30 Watt, which is
  • changing such lighting property may lead to a visible change of the light
  • changing the melanopic flux not necessarily leads to a visible change of the light.
  • changing the melanopic lux of light can be done while keeping e.g. the color point constant.
  • the melanopic flux may be kept constant while changing the color point or color temperature, etc. of the light.
  • At least the spectral power distribution of the light is controllable as well as another lighting property selected from the group consisting of correlated color temperature, color point, and intensity of the light. Note that different spectral power distributions may provide the same color point or correlated color temperature.
  • the intensity of the light will be controllable.
  • the color point and/or correlated color temperature of the light will be controllable.
  • the lighting device will comprise a plurality of light sources configured to provide light source light having different spectral power distributions.
  • the spectral power distribution of lighting device light may be controlled.
  • controllable in the context of the lighting properties especially refer to the possibility that a plurality of values, especially more than two, can be chosen for the respective lighting property.
  • controllable may imply a plurality of different intensity values between off and maximum power.
  • controllable may imply the possibility of selecting a plurality of different x- values and y- values (in the CIE 1931 color space).
  • one or more lighting properties, including the spectral power distribution, of the light are controllable.
  • the lighting system comprises a control system ("controller") adapted to provide at least a controlling mode which comprises maintaining a predetermined melanopic flux value of the light while allowing another lighting property of the light to be changed from a first lighting property value to a second lighting property value.
  • a control system adapted to provide at least a controlling mode which comprises maintaining a predetermined melanopic flux value of the light while allowing another lighting property of the light to be changed from a first lighting property value to a second lighting property value.
  • the control system may execute control based on the input of a sensor, such as a (day)light sensor, or may execute control based on a predefined (time) scheme.
  • control system may essentially autonomously select the predetermined melanopic flux value.
  • the control system may for example control the light based on the input of a (day)light sensor and adapt the light provided by the lighting system while taking into account (as much as possible) the already available (day)light.
  • control system may be configured to control the light as function of an activity of a user such as for example reading, studying, relaxing etc..
  • the type (and optionally intensity of the) activity may be retrieved from a device, a sensor, or a user input.
  • the control system may allow (via a user interface) input such as “low”, “medium”, “high”, etc. to be entered.
  • the control system may include a user interface device, such as a graphical user interface device and/or may functionally be coupled to a user interface device (such as a computer, smart phone, I-phone, etc.).
  • the melanopic flux value may also be selected by a user, e.g. via such user interface. The selected melanopic flux value may then be defined as the predetermined melanopic flux value.
  • the user may in embodiments also be able to select a condition or status that reflects a certain melanopic flux, or that reflects a certain melanopic flux at specific other conditions (such as early in the morning; or under specific lighting conditions). For instance, it may also be possible that the user may select options like “sleep”, “wake up”, “high alert”, “reading”, “working”, etc.. This may then be translated by the control system into a predetermined melanopic flux. Hence, the user may select input associated with a predetermined melanopic flux and/or the control system may include a routine which define the predetermined melanopic flux. For instance, the predetermined melanopic flux may be dependent upon the time of the day, day of the week, etc. Instead of the term “routine” also the term “scheme” or "program” may be used.
  • the predetermined melanopic flux value may in embodiments be a fixed value, but may in other embodiments be a variable value, e.g. variable based on a ((day)light) sensor, a time scheme, user interface input, etc..
  • control system is adapted to provide at least a controlling mode which comprises maintaining a predetermined melanopic flux value of the light while allowing another lighting property of the light to be changed from a first lighting property value to a second lighting property value.
  • a controlling mode which comprises maintaining a predetermined melanopic flux value of the light while allowing another lighting property of the light to be changed from a first lighting property value to a second lighting property value.
  • the control system is further adapted for providing another controlling mode, or a plurality of other controlling modes.
  • the control system may also be adapted to provide a controlling mode wherein essentially all lighting properties may be freely varied, or wherein another lighting property is fixed and one or more other, including the melanopic flux value, may be varied.
  • control system is adapted to provide at least a controlling mode which comprises maintaining a predetermined melanopic flux value of the light while allowing another lighting property of the light to be changed from a first lighting property value to a second lighting property value.
  • a controlling mode which comprises maintaining a predetermined melanopic flux value of the light while allowing another lighting property of the light to be changed from a first lighting property value to a second lighting property value.
  • the choice of such modes may especially be executed via a user interface, though other options, like executing a mode in dependence of a sensor signal or a (time) scheme may also be possible.
  • the control system may be in the controlling mode as defined herein from sunset to sunrise, allowing the user other lighting choices during the day, etc..
  • the term “controlling” and similar terms especially refer to at least determining the behavior or supervising the running of an element. Hence, herein "controlling" and similar terms may e.g.
  • controlling refers to imposing behavior to the element (determining the behavior or supervising the running of an element), etc., such as e.g. measuring, displaying, actuating, opening, shifting, changing temperature, etc..
  • controlling may additionally include monitoring.
  • controlling and similar terms may include imposing behavior on an element and also imposing behavior on an element and monitoring the element.
  • light and lighting properties can of course only be controlled within the technical boundaries that the system, such as for example the lighting device, provides (like maximum power, etc.).
  • control system is adapted to provide at least a controlling mode which comprises maintaining a predetermined melanopic flux value of the light while allowing another lighting property of the light to be changed from a first lighting property value to a second lighting property value
  • a controlling mode which comprises maintaining a predetermined melanopic flux value of the light while allowing another lighting property of the light to be changed from a first lighting property value to a second lighting property value
  • the melanopic flux value is at a fixed value, while one or more other lighting properties may be varied.
  • controlling a lighting property may include controlling such lighting property in dependence of one or more of a sensor signal, a (time) scheme and a user input (value or instruction).
  • the phrase "maintaining a predetermined melanopic flux value of the light” especially indicates that the melanopic flux value is essentially the same at the first lighting property value and the second lighting property value.
  • the terms “maintaining” and “essentially the same”, may especially refer to a change in value of the melanopic flux value of at maximum 20%, such as at maximum 10%.
  • the light has a first melanopic flux at the first lighting property value and a second melanopic flux at the second lighting property, wherein especially 0.9 ⁇
  • the value represents the melanopic flux value.
  • maintaining may also refer to “substantially maintaining”, or maintaining within some tolerance, which, as indicated above, may e.g. be in the range of about +/- 20%), such as about +/- 10%>, like especially about +/- 5%.
  • the control system is adapted to provide a mode wherein not only the melanopic flux value can (effectively) be held at a fixed value, but wherein also the luminous flux of the light can be held at a fixed value.
  • the controlling mode comprises maintaining said predetermined melanopic flux value and maintaining a predetermined luminous flux value or intensity level of the light while allowing another lighting property of the light to be changed from a first lighting property value to a second lighting property value.
  • the predetermined luminous flux value or intensity level of the light may be determined by the control system in dependence of one or more of a sensor signal, a time scheme, and a user input.
  • the light has a first melanopic flux at the first lighting property value and a second melanopic flux at the second lighting
  • the light has a first luminous flux level and first melanopsin effectiveness factor MEF1 at the first lighting property value and a second luminous flux level and second melanopsin effectiveness factor MEF2 at the second lighting property, wherein especially especially
  • the melanopic illuminance may be applied instead of the melanopic flux.
  • the luminous flux instead of the luminous illuminance may be applied instead of the illuminance.
  • MEF refers to Eq. 3 and E refers to illuminance (in lux (lx)).
  • mel refers to melanopic and "v” refers to luminous (with "v” from visible).
  • the term "predetermined melanopic flux value” does not necessarily mean that the melanopic flux value is eternally fixed.
  • the melanopic flux value may also vary according to a time scheme or in dependence of a sensor, such as a (day)light sensor.
  • the control system determines the melanopic flux value in dependence of such a sensor signal of such sensor or according to such time in such time scheme and as long as the control system does not change the so determined melanopic flux value, the melanopic flux value is the predetermined melanopic flux value from which, in the herein indicated mode, substantially no deviation is allowed.
  • the control system change the melanopic flux value, e.g. because of a changed (day)light intensity level or due to a change time, then the new melanopic flux value is the predetermined melanopic flux value, from which, in the herein indicated mode, substantially no deviation is allowed.
  • control system may be adapted to provide at least a controlling mode which comprises controlling the melanopic flux of the light in dependence of a ((day)light) sensor signal, wherein a temporary predetermined melanopic flux value is defined by said control system, and wherein said controlling mode comprises maintaining said temporary predetermined melanopic flux value while allowing another lighting property of the light to be changed from a first lighting property value to a second lighting property value.
  • the control system may define the temporary predetermined melanopic flux value based on a predefined scheme with relation to sensor signals and (predetermined) melanopic flux value.
  • Other sensor signal(s) than a (day)light sensor signal may also be used as input, either additionally or alternatively, such as a presence sensor, a temperature sensor, etc..
  • the control system may be adapted to provide at least a controlling mode which comprises controlling the melanopic flux of the light as function of a time scheme defining the melanopic flux of the light as function of one or more of time, day, week, month and season, wherein a temporary predetermined melanopic flux value is defined by said control system, and wherein said controlling mode comprises maintaining said temporary predetermined melanopic flux value while allowing another lighting property of the light to be changed from a first lighting property value to a second lighting property value.
  • the time scheme may include a calendar.
  • the time scheme may include information about activities and/or about rest periods.
  • the time scheme may be based on circadian rhythm data, etc.
  • the present disclosure also provides a lighting device suitable for use in the lighting system as a controllable lighting device (and for use in the herein described controlling mode).
  • the lighting system may also be part of a (larger) system, such as a (lighting) system for a hospitality area, such as restaurant, a hotel, a clinic, or a hospital, etc..
  • a (lighting) system for a hospitality area, such as restaurant, a hotel, a clinic, or a hospital, etc.
  • Such (lighting) system may include a single control system.
  • the disclosure also provides a (lighting) system comprising a plurality of lighting devices as defined herein and said control system as defined herein, wherein the control system is adapted to provide at least a controlling mode which comprises maintaining a predetermined melanopic flux value of the light of one or more of said lighting devices while allowing another lighting property of the light to be changed from a first lighting property value to a second lighting property value.
  • a controlling mode which comprises maintaining a predetermined melanopic flux value of the light of one or more of said lighting devices while allowing another lighting property of the light to be changed from a first lighting property value to
  • predetermined melanopic flux value in those areas or maintain different predetermined melanopic flux value in those areas, or maintain in one or more areas a predetermined melanopic flux value while allowing varying the melanopic flux value in other areas.
  • the predetermined melanopic flux value may be set (but may depend on the time of the day), and at the front desk a relatively high predetermined melanopic flux value is set to keep personnel alert during night hours.
  • the lighting device or lighting system may be part of or may be applied in e.g. office lighting systems, household application systems, shop lighting systems, home lighting systems, accent lighting systems, spot lighting systems, theater lighting systems, fiber-optics application systems, projection systems, self-lit display systems, pixelated display systems, segmented display systems, warning sign systems, medical lighting application systems, indicator sign systems, decorative lighting systems, portable systems, automotive applications, (outdoor) road lighting systems, urban lighting systems, green house lighting systems, horticulture lighting, or LCD backlighting.
  • office lighting systems household application systems, shop lighting systems, home lighting systems, accent lighting systems, spot lighting systems, theater lighting systems, fiber-optics application systems, projection systems, self-lit display systems, pixelated display systems, segmented display systems, warning sign systems, medical lighting application systems, indicator sign systems, decorative lighting systems, portable systems, automotive applications, (outdoor) road lighting systems, urban lighting systems, green house lighting systems, horticulture lighting, or LCD backlighting.
  • the lighting device or lighting system may be used as backlighting unit in an LCD display device.
  • the present disclosure provides also a LCD display device comprising a lighting system as defined herein, configured as backlighting unit.
  • the present disclosure also provides in a further aspect a liquid crystal display device comprising a backlighting unit, wherein the backlighting unit comprises one or more lighting devices as defined herein.
  • the present disclosure also provides an electronic device comprising a backlighting unit, wherein the electronic device comprises a lighting system as defined herein and wherein said backlighting unit comprises a lighting device as defined herein.
  • Such electronic device may also include a plurality of lighting system.
  • the electronic device comprises a lighting system as defined herein, wherein said backlighting unit comprises a plurality of a lighting devices as defined herein.
  • the electronic device may for example be a display or a mobile device such as a smart phone, an i-Phone, a tablet, etc..
  • the lighting device comprises at least four different light sources, even more especially at least five different light sources.
  • the different light sources may have a different spectral power distribution of its light output. Controlling the contribution of each of the different light sources to the lighting device light output, for example by varying the intensity of the light output from at least one of the different light sources, also controls the spectrum power distribution of said lighting device light and may allow varying the lighting properties of the lighting device light while maintaining the melanopic flux value essentially constant.
  • the invention also provides a method of controlling light, wherein one or more lighting properties, including the spectral power distribution, of the light are controllable, the method comprising providing said light with a predetermined melanopic flux value of the light, wherein the method further comprises maintaining said predetermined melanopic flux value of the light while changing another lighting property of the light from a first lighting property value to a second lighting property value.
  • a method of controlling light comprising providing said light with a predetermined melanopic flux value of the light, wherein the method further comprises maintaining said predetermined melanopic flux value of the light while changing another lighting property of the light from a first lighting property value to a second lighting property value.
  • the other lighting property is selected from the group consisting of correlated color temperature, color point, relative gamut area index, and intensity of the light, such as one or more of correlated color temperature, color point, and intensity of the light.
  • the light has a first melanopic flux at the first lighting property value and a second melanopic flux at the second lighting property, wherein the method further comprises maintaining a predetermined melanopic flux value of the light in the range
  • the light has a first luminous flux level ( ⁇ ⁇ ⁇ ) and first melanopsin effectiveness factor MEF1 at the first lighting property value and a second luminous flux level ( ⁇ ⁇ 2) and a second melanopsin effectiveness factor MEF2 at the second lighting property, wherein the method further comprises maintaining the flux and melanopsin effectiveness factor of the light in the range of
  • the predetermined melanopic flux value may also be dependent upon a sensor signal or (time) scheme.
  • the method comprises controlling the melanopic flux of the light as function of a time scheme defining the melanopic flux of the light as function of one or more of time, day, week, month and season, wherein a temporary predetermined melanopic flux value is defined by said control system based on said time scheme, and wherein the method further comprises maintaining said temporary predetermined melanopic flux value while changing another lighting property of the light to be changed from a first lighting property value to a second lighting property value.
  • the present disclosure also provides a computer program product, when running on a computer which is functionally coupled to a lighting device, is capable of bringing about the method as described herein, wherein the lighting device is configured to provide light, wherein one or more lighting properties, including the spectral power distribution, of the light are controllable.
  • the computer may be the processor of the system controller as described herein.
  • the apparatus may especially be configured to provide white light.
  • white light is known to the person skilled in the art. It especially relates to light having a correlated color temperature (CCT) between about 1500 and 20000 K, especially 2000-20000 K, for general lighting especially in the range of about 2000 K and 6500 K, and for backlighting purposes especially in the range of about 7000 K and 20000 K, and especially within about 15 SDCM (standard deviation of color matching) from the BBL (black body locus), especially within about 10 SDCM from the BBL, even more especially within about 5 SDCM from the BBL.
  • CCT correlated color temperature
  • Fig. 1 shows the normalized melanopic sensitivity function of the human eye
  • Fig. 2 shows the minimum and maximum MEF that can be obtained by tuning the spectral power distribution in order to achieve a given CCT while also fulfilling the CRI requirement as specified.
  • the reference MAX in Fig. 2 refers to the curve indicating the unrestricted maximum; the reference MIN refers to the curve indicating the unrestricted minimum.
  • the ranges are theoretical MEF ranges with a 2° observer;
  • Figs. 3A-3C schematically depict some embodiments of the lighting system, lighting system, and electronic device
  • MF melanopic flux
  • Figs. 5A-5B shows examples at different lux levels, with Fig. 5a at 300 lux and Fig. 5c at 600 lux; on the x-axis the correlate color temperature (CCT) and on the y-axis the melanopic lux (MF) are indicated;
  • Fig. 6A shows spectral power distribution of three settings of a lighting device wherein the melanopic (f)lux is essentially identical, but wherein one or more other lighting parameters are varied;
  • Fig. 6B shows spectral power distribution of light of light sources that can be used for the lighting system.
  • Fig.l shows the relative melanopic (m) and photopic (p) human eye sensitivity functions.
  • the maximum sensitivity for the melanopic function is at 490 nm, the full width half maximum values are at 447 nm and 531 nm, as indicated in the numerical representation of the melanopic function in the table below.
  • a system which, when decreasing the colour temperature the melanopic stimulation goes down, see Fig. 2.
  • This is undesired in applications where for instance light is used to improve mood or even treat depression.
  • a higher melanopic stimulation is believed to be more effective in achieving these non- visual benefits of light.
  • the disclose system allows the user to decrease colour temperature while maintaining the same melanopic illuminance, thus securing the biological effect.
  • the user can lower the colour temperature of for instance a light system or light therapy device without lowering the melanopic dose.
  • the light controller automatically changes the emitted spectrum of the system to lower the CCT without changing the melanopic or photopic illuminance.
  • the disclosure provides amongst others a lighting system that comprises at least one lighting device and at least one (programmed) controller ("control system").
  • the controller is configured to vary the spectral intensity of the light of the system, in such a way that, at least during part of the time, the melanopic flux (i.e., the amount of melanopic lumen or melanopic illuminance) generated by the system is kept virtually constant or changes less than 10% when the lighting system changes colour temperature, and/or colour, and/or dim level.
  • the melanopic flux i.e., the amount of melanopic lumen or melanopic illuminance
  • the controller also keeps lighting properties such as the colour temperature and/or the CRI and/or the relative gamut area index (now denoted as Color Saturation Index) constant, or minimizes undesired changes in these parameters, while changing another lighting property.
  • lighting properties such as the colour temperature and/or the CRI and/or the relative gamut area index (now denoted as Color Saturation Index) constant, or minimizes undesired changes in these parameters, while changing another lighting property.
  • the lighting system also automatically generates a dynamic lighting rhythm.
  • a dynamic lighting rhythm For the relative gamut area index, see also Teunissen C, van der Heijden F, Poort S, de Beer E. Characterising user preference for white LED light sources with CIE colour rendering index combined with a relative gamut area index. Lighting Research and Technology 2016; 0: 1-20.
  • Fig. 3 A schematically depicts an embodiment of a lighting system 1000 as defined herein.
  • the lighting system 1000 comprises a lighting device 100 configured to provide light 101, wherein one or more lighting properties, including the spectral power distribution, of the light 101 are controllable, wherein the lighting system 1000 further comprises a control system 200 adapted to provide at least a controlling mode which comprises maintaining a predetermined melanopic flux value of the light 101 while allowing another lighting property of the light 101 to be changed from a first lighting property value to a second lighting property value.
  • the lighting system 1000 may execute a method of controlling light 101, wherein one or more lighting properties, including the spectral power distribution, of the light 101 are controllable, the method comprising providing said light 101 with a predetermined melanopic flux value of the light 101, wherein the method further comprises maintaining said predetermined melanopic flux value of the light 101 while changing another lighting property of the light 101 from a first lighting property value to a second lighting property value.
  • the lighting device 100 is especially configured to provide light 101 wherein one or more lighting properties, including the spectral power distribution, of the light 101 are controllable.
  • a lighting device 100 may comprise one or more light sources 10.
  • the light sources 10 may all generate light with different spectral power distributions.
  • the light generated by the device(s) is indicated with reference 101.
  • the light may comprise the contributions of one or more of the light sources, dependent upon the mode and the light sources.
  • the light generated by the device may comprise the contributions of one or more of the lighting devices, dependent upon the mode and the lighting devices.
  • Reference 210 indicates an optional user interface, e.g. to change the mode or to change the predetermined melanopic flux value, or to change another lighting property.
  • the user interface may be comprised by the control system or may be remote.
  • the user interface 210 is functionally coupled with the control system 200.
  • Fig. 3B schematically depicts an embodiment of a lighting system 1000 comprising a plurality of lighting devices 100 and the control system 200 as defined herein.
  • the control system 200 is adapted to provide at least a controlling mode which comprises maintaining a predetermined melanopic flux value of the light 101 of one or more of said lighting devices 100 while allowing another lighting property of the light 101 to be changed from a first lighting property value to a second lighting property value.
  • such lighting system 1000 may allow different predetermined melanopic flux value for the different lighting devices 100, if desired.
  • a hospitality area is schematically depicted with left a control room with the control system 200 and a user interface 210, such as a computer, and right e.g.
  • the invention also provides a computer program product, when running on a computer which is functionally coupled to a lighting device 100, is capable of bringing about the method as described herein.
  • the lighting devices 100 include sleeve control systems 200', which are subordinate to the (master) control system 200.
  • Fig. 3C very schematically depicts an embodiment of an electronic device 2000 comprising a backlighting unit 2100.
  • the electronic device 2000 comprises a lighting system 1000 as described with Fig. 3 A or Fig. 3B.
  • the backlighting unit 2100 comprises said lighting device(s) 100.
  • the electronic device 2000 can e.g. be a display or a mobile device.
  • Reference 2200 indicates a screen.
  • the user may change CCT from setting 1 to 2, while keeping for example the light intensity constant, and the controller automatically adjusts the spectral composition of the light system so that the MEF of the system is not affected, or changes less than 10%
  • the illuminance Ev (expressed in photopic lux) is changed from Evl to Ev2 by for example the user or the system to secure a desired dynamic lighting rhythm and the controller automatically adjusts the spectral composition of the light (changing the MEF from MEF1 to MEF2) to keep MEF * Ev constant, or with less than 10 % change
  • Fig. 4A shows an example with keeping melanopic flux and CCT constant while changing the photopic flux (see arrows A and B).
  • Each line in Fig. 4A and Fig. 4B represents the change in melanopic flux during dimming when the spectrum is not adapted, using the spectrum that corresponds 3000 K and 6500 K points on the Min and Max MEF lines in Fig. 2.
  • Fig. 4A shows the relationship between photopic and melanopic flux for a CCT of 3000 K.
  • Fig. 4B illustrates the same for a CCT of 6500 K.
  • Each line represents a spectrum with a combination of a given MEF value and a CRI taking the right points from Fig. 2. In case A (arrow A) in Fig.
  • the controller changes the light spectrum in order to keep the (equivalent) melanopic illuminance, which is expressed in (equivalent) melanopic lux (melanopic lux), see Lucas et al. 2014), constant at 200 melanopic lux.
  • Lucas et al. 2014 describes that light is a potent stimulus for regulating circadian, hormonal, and behavioral systems.
  • light therapy is effective for certain affective disorders, sleep problems, and circadian rhythm disruption.
  • These biological and behavioral effects of light are influenced by a distinct photoreceptor in the eye, melanopsin- containing intrinsically photosensitive retinal ganglion cells (ipRGCs), in addition to conventional rods and cones.
  • ipRGCs melanopsin- containing intrinsically photosensitive retinal ganglion cells
  • Fig. 5 shows examples with keeping the melanopic illuminance (or flux) and photopic illuminance (or flux) constant while changing CCT (see arrows).
  • Each line represent the change in melanopic flux when the CRI and MEF setting (either max or min from Fig. 2) are not adapted when changing the CCT while keeping the photopic illuminance constant to 300 lx (Fig. 5A) or 600 lx (Fig. 5B).
  • the system automatically changes the spectrum of the light (switching from one line to the other) to ensure that the melanopic flux remains constant, so that the melanopic illuminance for the user remains 60 (equivalent) melanopic lux for use case D (arrow D in Fig. 5A) and at 500 melanopic melanopic lux for use case C (arrow C in Fig. 5B).
  • use case C when the CCT from the light is changed from about 6000 K to about 2500 K, the system tries to adjust the spectrum to keep its MEF while also maintaining its original CRI value. However, when the user changes CCT from about 6000K to about 2500K, i.e.
  • the system will look for the spectrum that minimizes the reduction in CRI while securing the melanopic flux remains constant. The use cases are further explained in the examples of execution.
  • arrows in Figs. 4A-5B indicate a change from a first lighting property value to a second lighting property value.
  • the user changes both the colour temperature and the luminous intensityof the light and the controller automatically adjusts the spectral composition of the light to keep the melanopic illuminance of the user (more precisely the melanopic flux value) constant.
  • the user changes the colour of for instance a Philips Hue light source and the controller automatically adapts the spectrum to keep the melanopic flux value constant.
  • a bedside light keeps the melanopic flux below a threshold level so that the melanopic illuminance does not exceed 40 melanopic lux when the user increases the (luminous) intensity of the light for bedside reading prior to sleep, thus limiting suppression of the sleep supporting hormone melatonin.
  • the relevant melanopic illumance is at the location of the user (e.g. the location reading page or the eye level of the user).
  • a user may lower the intensity or colour temperature of a light therapy device because he/she does not find it comfortable and the system will automatically adjust the MEF of the spectrum to keep the melanopic illuminance for the user constant, thus securing effectiveness of the light therapy.
  • This corresponds to use case A in Fig. 4 A or Fig. 4B, where the system secures a melanopic flux that results in a melanopic illuminance (at the eye of the user) of 200 melanopic lux.
  • a user may select an intensity or CCT of office lighting that normally would moves the melanopic flux outside a desired range for alert office work.
  • the system will then automatically choose a light condition with a light spectrum having the highest possible CRI while maintaining the melanopic flux (or melanopic illuminance) in the desired range, for instance to enhance subjective alertness of users or to support their circadian rhythms.
  • This use case is shown as C in Fig. 5B for a user that uses light with a pho topic illuminance of 600 lx and wishes to switch to a warmer, more socializing, colour tone (CCT 6000 to 2300 K).
  • the system In order to secure the melanopic flux/activation (with a melanopic illuminance at the eye level or task level of the user of least 500 melanopic lux) the system automatically adopts a spectrum corresponding to the solid line with the desired CCT, but with a CRI of 50 instead of the original CRI of 80 of the black dotted line.
  • a bedside light keeps the melanopic illuminance (at the eye level) at a low melanopic lux level to limit suppressing the sleep supporting hormone melatonin when the user chooses a high colour temperature for bedside reading prior to sleep.
  • This is sketched by the use case D arrow in Fig. 5A for a user switching from about 2000 K to about 2500 K at a photopic illluminance of 300 lx.
  • the system cannot switch to a spectrum that maintains both CRI and secures the low melanopic flux. Therefore it switches to the desired CCT but with a lower CRI (adopting the spectrum of the dashed line).
  • control system may adapt the spectral power distribution depending on the light intensity chosen by the user.
  • control system may provide a 24 dynamic lighting rhythm to one or more lighting properties, such as the melanopic lux value.
  • the discloses system may be applied in backlights in displays or mobile devices that automatically adjust spectrum depending on a time and intensity chosen by the user.
  • the disclosed method may be applied in a lighting system that automatically adjusts the CCT and intensity range that a user can choose from depending on the time of day or the current melanopic flux or a desired melanopic flux, or a desired melanopic
  • the desired melanopic flux need not be constant but can also vary over time. During daytime the melanopic illuminance at the eye level of a user may exceed 400
  • melanopic lux to secure sufficient subjective alertness (moreover, a high daytime melanopic flux also strengthens the body clock and the circadian rhythm) while at night it is below 40 melanopic lux to prevent sleep disruption.
  • FIG. 6A An example is shown in Fig. 6A.
  • This Figure shows three different spectral power distributions, generated with a plurality of LED primaries. The following values were targeted at:
  • Fig. 6B shows the spectral power distributions of an embodiment using a combination of LED light sources, wherein the spectral power distributions are normalized to 1 for convenience.
  • the light of the different light sources can be mixed in specific combinations.
  • these spectra were used with the below indicated radiant powers (in units of W/m 2 ) per LED light source.
  • curve 1 refers to the LED with indication "green”
  • curve 2 refers to the LED with indication "520 nm”
  • curve 3 refers to the LED with indication “635 nm”
  • curve 4 refers to the LED with indication "420 nm”
  • curve 5 refers to the LED with indication "475 nm”.
  • a lighting device comprising a plurality of (solid state) light sources able to generate light having a spectral distribution in at least the following wavelength ranges a) 410-490 nm, especially 410-435 nm and/or 455-490 nm, b) 505-530 nm, especially 510-530 nm, c) 535-575 nm, especially 535-565 nm, and d) 610-680 nm, especially 620-650 nm.
  • the (solid state) light sources have peak wavelengths in the indicated wavelength ranges.
  • substantially may also include embodiments with “entirely”, “completely”, “all”, etc. Hence, in embodiments the adjective substantially may also be removed. Where applicable, the term “substantially” may also relate to 90% or higher, such as 95% or higher, especially 99%) or higher, even more especially 99.5% or higher, including 100%).
  • the term “comprise” includes also embodiments wherein the term “comprises” means “consists of.
  • the term “and/or” especially relates to one or more of the items mentioned before and after "and/or”. For instance, a phrase “item 1 and/or item 2" and similar phrases may relate to one or more of item 1 and item 2.
  • the term “comprising” may in an embodiment refer to “consisting of but may in another embodiment also refer to "containing at least the defined species and optionally one or more other species”.
  • the invention further applies to a device comprising one or more of the characterizing features described in the description and/or shown in the attached drawings.
  • the invention further pertains to a method or process comprising one or more of the characterizing features described in the description and/or shown in the attached drawings.

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Abstract

L'invention concerne un système d'éclairage (1000) comprenant un dispositif d'éclairage (100) conçu pour fournir de la lumière (101), une ou plusieurs propriétés d'éclairage, comprenant la distribution de puissance spectrale, de la lumière pouvant être commandées, le système d'éclairage comprenant en outre un système de commande (200) conçu pour fournir au moins un mode de commande qui consiste à maintenir une valeur de flux mélanopique prédéterminée de la lumière (1010) tout en permettant à une autre propriété d'éclairage de la lumière (101) d'être changée d'une première valeur de propriété d'éclairage à une seconde valeur de propriété d'éclairage.
PCT/EP2017/084188 2017-01-12 2017-12-21 Système d'éclairage qui maintient la dose mélanopique pendant une gradation ou un réglage de couleur WO2018130403A1 (fr)

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US11246198B2 (en) 2018-01-11 2022-02-08 EcoSense Lighting, Inc. Two-channel tunable lighting systems with controllable equivalent melanopic lux and correlated color temperature outputs
US10805998B2 (en) 2018-01-11 2020-10-13 EcoSense Lighting, Inc. Display lighting systems with circadian effects
US10827580B2 (en) 2018-01-11 2020-11-03 EcoSense Lighting, Inc. Two-channel tunable lighting systems with controllable equivalent melanopic lux and correlated color temperature outputs
US11308849B2 (en) 2018-01-11 2022-04-19 Ecosense Lighting Inc. Display lighting systems with circadian effects
US11369013B2 (en) 2018-01-11 2022-06-21 Korrus, Inc. Two-channel tunable lighting systems with controllable equivalent melanopic lux and correlated color temperature outputs
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WO2020043649A1 (fr) 2018-08-31 2020-03-05 Signify Holding B.V. Lumière blanche enrichie au cyan
CN112640582A (zh) * 2018-08-31 2021-04-09 昕诺飞控股有限公司 富含青色的白色光
US11938339B2 (en) 2018-11-08 2024-03-26 Korrus, Inc. Switchable bioactive lighting
WO2020097575A1 (fr) * 2018-11-08 2020-05-14 Ecosense Lighting Inc. Éclairage bioactif multicanal
US11785694B2 (en) 2019-09-12 2023-10-10 Savant Systems, Inc. Circadian lighting in a diverse home automation system
WO2021050909A1 (fr) * 2019-09-12 2021-03-18 Savant Systems, Inc. Éclairage circadien dans un système de domotique divers
US12219675B2 (en) 2020-05-15 2025-02-04 Signify Holding B.V. Melanopic light system with high CRI using cyan direct emitters
WO2022006654A1 (fr) * 2020-07-08 2022-01-13 Suntracker Technologies Ltd. Prédiction et mesure de dose mélanopique
US11287321B2 (en) 2020-07-08 2022-03-29 Suntracker Technologies Ltd. Predicting and measuring melanopic dose
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US11590252B2 (en) 2020-07-08 2023-02-28 Suntracker Technologies Ltd. Predicting spherical irradiance for volume disinfection
EP3970485A1 (fr) * 2020-09-18 2022-03-23 Signify Holding B.V. Système de génération de lumière pour conservation d'arthropodes
US12171204B2 (en) 2020-09-18 2024-12-24 Signify Holding B.V. Light generating system for arthropod keeping
WO2022058341A1 (fr) * 2020-09-18 2022-03-24 Signify Holding B.V. Système de génération de lumière pour l'élevage d'arthropodes
CN112291906A (zh) * 2020-09-29 2021-01-29 佛山电器照明股份有限公司 一种生物节律照明系统
EP4240480A4 (fr) * 2020-11-09 2024-08-07 Queensland University Of Technology Dispositif, procédé et système d'éclairage équilibré biologiquement
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WO2023112392A1 (fr) * 2021-12-16 2023-06-22 株式会社エルム Dispositif électroluminescent
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WO2025031910A1 (fr) * 2023-08-07 2025-02-13 Be Sapiens S.R.L. Appareil et procédé d'éclairage

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