JP2002184587A - Lighting method and lighting device for lighting equipment - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a lighting method and a lighting device for a lighting device that can perform initial illuminance correction even when using a lighting device whose illuminance gradually decreases as the lighting time elapses. Energy saving and stable illuminance required. SOLUTION: A plurality of sets of lighting fixtures whose illuminance gradually decreases as the lighting time elapses are arranged as one set of S units. At the time of the initial illuminance at which a high illuminance is ensured, the number of illuminating devices that are simultaneously turned on out of the set of S luminaires is reduced to the number S−n at which the required minimum illuminance is ensured, and the lighting devices are turned on. When the illuminance of the Sn lighting fixtures decreases to the required minimum illuminance as the lighting time elapses, the lighting is performed by the Sn + 1 units to secure the required minimum illuminance. Thereafter, similarly, when the illuminance of the luminaires decreases to the required minimum illuminance, n luminaires are sequentially added one by one, and finally a set of S luminaires is turned on.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lighting apparatus which uses a lighting apparatus whose illuminance gradually decreases as the lighting time elapses, and which enables initial illuminance correction to prevent glare and save energy. And a lighting device.

[0002]

2. Description of the Related Art As a high-pressure discharge lamp (HID) used as a lighting device for high ceilings in factories, warehouses, gymnasiums, etc., there is a metal halide lamp having high luminous efficiency which is frequently used like a mercury lamp. Since the luminous efficiency of this metal halide lamp is 1.6 to 1.9 times that of a mercury lamp, when securing the same illuminance, it is superior to a mercury lamp in terms of initial cost and life cycle cost (LCC), and its use has increased in recent years. are doing. When this type of metal halide lamp is used as a lighting fixture for high ceilings in factories and the like, even when the luminous flux is reduced when replacing the lamp, for example, a plurality of lamps are arranged at regular intervals in the vertical and horizontal directions on the assumption that the required illuminance can be obtained. Lighting was planned so as to be distributed and obtain a uniform light distribution.

[0003]

However, the luminous efficiency of a metal halide lamp is 1.6 to 1.9 that of a mercury lamp.
Although it is twice, the illuminance / initial illuminance at the time of luminous flux reduction at the time of lamp replacement, that is, the maintenance rate is poor, and as shown in Table 1 and FIG. The luminous flux is reduced to about 50%.

[0004]

[Table 1]

For this reason, when an illumination plan is made based on the illuminance at the time when the luminous flux is reduced, the initial illuminance becomes too high in an initial use state in which the luminous flux is not reduced, causing a problem that the illumination is perceived as dazzling. . In the case of the metal halide lamp, the initial illuminance correction by the inverter method cannot be adopted, and thus, the amount of the initial illuminance higher than the required illuminance wasted energy. In addition, since the initial illuminance is turned on more than necessary, if the illuminance gradually decreases with the elapse of the use time, there is a problem that the user feels dark even though the set illuminance is secured.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and provides a lighting method of a lighting fixture that enables initial illuminance correction even when a lighting fixture whose illuminance gradually decreases as the lighting time elapses. And a lighting device,
The purpose is to save energy and ensure the required illuminance stably.

[0007]

According to a first aspect of the present invention, there is provided a lighting method of a lighting apparatus, comprising:
A plurality of sets of lighting fixtures whose illuminance gradually decreases as the lighting time elapses are arranged as one set of S units, and the lighting fixtures which are simultaneously turned on among the set of S sets of lighting fixtures at the time of the initial illuminance in which a high illuminance is secured. When the illuminance of the Sn lighting fixtures decreases to the required minimum illuminance with the lapse of the lighting time, S is turned on.
-N + 1 units are turned on to secure the required minimum illuminance, and thereafter, similarly, when the illuminance of the luminaires decreases to the required minimum illuminance, n additional luminaires are sequentially added one by one and finally S It is characterized in that a set of lighting equipment is turned on.

In this lighting method of lighting equipment, at the time of initial illuminance at which high illuminance is ensured, the lighting equipment which is simultaneously lit out of the set of S lighting equipment is replaced by the number S-n at which the required minimum illuminance is ensured. Lights down to Therefore, in this state, conventionally, the n illuminated lighting devices are in the light-off state, and accordingly, excessive illuminance is reduced and energy saving is achieved. When the illuminances of the Sn lighting fixtures decrease to the required minimum illuminance as the lighting time elapses, the lighting is performed by the Sn + 1 units, and the required minimum illuminance is secured. Thereafter, similarly, when the illuminance of the luminaires decreases to the required minimum illuminance, the luminaires are sequentially added up to n units one by one, and finally all the lamps of the S units are turned on. This prevents glare and unnecessary power consumption caused by turning on all the S units at the time of the initial illuminance, and always ensures the required minimum illuminance (that is, the initial illuminance correction).

The lighting method of the lighting apparatus according to the second aspect is characterized in that
-When the time when the n lighting fixtures are turned on to the required minimum illuminance is T, the lighting time of each of the S lighting fixtures is {(S-n) / S} x T. It is characterized in that, out of the S lighting fixtures, the lighting fixtures that are turned off are sequentially replaced.

In this lighting method of lighting equipment, the lighting time of each of the S lighting equipment is Δ (S) while the Sn lighting equipment is lit for T hours and the illuminance decreases to the required minimum illuminance.
−n) / S｝ × T, among S lighting fixtures,
The lighting fixtures in the unlit state are sequentially changed. As a result, each of the S units of lighting equipment has an equal lighting time. For example, in the case where a set of four luminaires is turned on and three illuminators are lit to secure the illuminance, and in this state the illuminance is turned on for T = 2000 hours and the illuminance is reduced to the required minimum illuminance,
/ 4｝ × 2000 = 1500, and the lighting fixtures in the light-off state are sequentially changed so that the lighting time of one lighting fixture is 1500 hours.

According to a third aspect of the present invention, in the lighting method of the lighting equipment, the S lighting equipments are four, and the four lighting equipments are paired on the diagonal orthogonal to each other at an equal distance from the intersection. It is characterized by being arranged at a time.

[0012] In this lighting method of the lighting equipment, four lighting equipments are arranged on an orthogonal diagonal line, one pair at an equal distance from the intersection. In other words, four lighting fixtures
It is located at each corner of the square. Then, a set of four luminaires similarly arranged is continuously arranged vertically and horizontally. Therefore, the number n of the lighting fixtures to be turned off is 1 or 2
Even in the case of (2), it is possible to avoid consecutively turning off two adjacent lighting devices in the entire lighting device array. As a result, a uniform light distribution can be obtained.

According to a fourth aspect of the present invention, the illuminance gradually decreases as the lighting time elapses, and the luminaires are arranged in a plurality of sets with the S units as one set, and the luminaires are arranged at a common position in each set. At least S relays connected to each of the luminaires grouped into the S system by connecting the luminaires, and the number of the luminaires required for the set of the S luminaires for which the required minimum illuminance is secured When the illuminance of the luminaires decreases from the S-n units to the required minimum illuminance, the luminaires are sequentially added up to n units one by one, and finally a set of luminaires of the S units is turned on and off in a stepwise different manner. A plurality of transmission devices that transmit signals, a relay control terminal unit that simultaneously operates the relays of the lighting fixture group corresponding to the lighting pattern signal by inputting a lighting pattern signal from the transmission device, of Select lighting pattern signal at any one of the transmission device from a serial transmission apparatus, characterized by comprising a changeover switch is input to the relay control terminal unit.

In this illuminating device, the number of S-n luminaires of a set of luminaires, from which a required minimum illuminance is ensured, is sequentially increased to one.
A plurality of transmission devices that transmit stepwise different lighting pattern signals to add up to n units for each unit and finally turn on all the lights of the S unit, and turn on by input of the lighting pattern signal from this transmission device A relay control terminal unit for simultaneously operating relays corresponding to the pattern signal is provided, and an arbitrary lighting pattern signal is selected from a plurality of transmission devices by a changeover switch and input to the relay control terminal unit. Thereby, even in the case of using a lighting fixture whose illuminance decreases with the elapse of the lighting time, according to the decrease in the illuminance, the optimal number of lighting fixtures are turned on, and at the time of the initial illuminance at which a high illuminance is secured. Dazzling and unnecessary power consumption are prevented, the lighting equipment can be turned on with high efficiency, and energy saving is achieved.

According to a fifth aspect of the present invention, there is provided the lighting device of the S units when the time when the Sn lighting devices selected by the transmission device are turned on to the required minimum illuminance is T. And a program timer device for transmitting a rotation switching signal for sequentially changing the lighting fixtures in an unlit state among the S lighting fixtures so that the lighting time of the lighting fixtures becomes {(Sn) / S} × T. It is characterized by the following.

In this lighting device, the Sn lighting devices selected by the transmission device are turned on by the rotation switching signal sent from the program timer device.
Lighting time of each lighting fixture of the table {(Sn) / S} ×
The lighting fixtures in the turned-off state among the S lighting fixtures are sequentially changed so as to be T. Thereby, it becomes possible to make each lighting fixture of a set of S units a uniform lighting time.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a lighting method and a lighting apparatus according to the present invention will be described below in detail with reference to the drawings. FIG. 1 is a block diagram showing a schematic configuration of a lighting device according to the present invention, FIG. 2 is a block diagram showing an example of system division of a lighting fixture group, and FIG. 3 is an example of rotation switching and stage switching of the example of system division in FIG. FIG. 4 is a time chart showing a specific example of the rotation switching shown in FIG.

In the lighting device 1 according to the present embodiment, a metal halide lamp whose illuminance gradually decreases as the lighting time elapses is used as the lighting fixture 3. Lighting equipment 3
With S units (for example, four units in this example) as one set, a plurality of sets are arranged at equal intervals vertically and horizontally. Therefore, a plurality of lighting fixtures 3 are arrayed vertically and horizontally on the ceiling surface in multiples of four.

As shown in FIG. 2, the lighting fixtures 3a (3b, 3c, or 3d) arranged at the common position of each set are
Connected by one circuit, S system (4 systems in this example) V, W,
The system is divided into X and Y. At least S (4 in this example) relays (remote control relays) are provided for each of the systems V, W, X, and Y of the lighting fixture group thus divided.
5a, 5b, 5c and 5d are connected. The remote control relays 5a, 5b, 5c and 5d may be divided into a plurality of systems according to the capacity. Thus, for example, if the first remote control relay 5a is turned on and off, the lighting fixtures 3a of one system V arranged at the common position of each group are turned on and off at the same time.

Each of the remote control relays 5a, 5b, 5
The terminals c and 5d are connected to the relay control terminal unit 7, and the opening and closing control signals input from the relay control terminal unit 7 allow arbitrary units to be simultaneously operated and controlled. The relay control terminal unit 7 operates as an A / D converter that converts a digitized lighting pattern signal transmitted from a transmission device described later into an analog control signal and transmits the analog control signal.

The lighting device 1 is provided with a plurality (three in this example) of transmission devices 9a, 9b, 9c for transmitting different lighting pattern signals in a stepwise manner. From these transmission devices 9a, 9b, and 9c, in the S-n (n = 2 and n = 1 in this example) lighting fixtures 3 in which the required minimum illuminance is secured, the illuminance has decreased to the required minimum illuminance. Occasionally, a lighting pattern signal for sequentially adding n lighting fixtures 3 to each of the lighting fixtures 3 and finally lighting a set of S lighting units is transmitted stepwise.

That is, from the first transmission device 9a, a lighting pattern signal for lighting two of the four luminaires 3 is transmitted. From the second transmission device 9b, a lighting pattern signal for lighting three of the four lighting devices 3 is transmitted. A lighting pattern signal for lighting all four lamps is transmitted from the third transmission device 9c.

A program timer device 11 is connected to the first transmission device 9a and the second transmission device 9b. The program timer device 11 is
a, 9b may be connected individually to each
Alternatively, one multi-controllable device may be connected to each of the transmission devices 9a and 9b. The program timer device 11 sends to the transmission devices 9a and 9b a rotation switching signal for sequentially replacing the lighting fixtures 3 in the off state among the S lighting fixtures 3. When the time when the Sn lighting devices 3 are turned on to the required minimum illuminance is T, the rotation switching signal indicates that the lighting time of each of the S lighting devices 3 is ｛(S−n) / This is a signal for performing a timetable so that S｝ × T.

The rotation switching signal sent from the program timer device 11 is converted into a digital signal via the contact T / U 13 and is transmitted to the respective transmission devices 9a, 9a.
9b. Also, the program timer device 11
A relay contact 15 is provided between the relay and the contact T / U13. A relay 17 having this relay contact 15 is connected to each transmission device 9a via a contact T / U19.
9b is connected. The relay 17 includes the transmission device 9
a, 9b, the contact opening / closing signal sent from the contact T / U1
9 converts a digital signal into an analog signal and inputs it.

These three transmission devices 9a, 9b, 9c
The relay control terminal unit 7 is manually operated by a changeover switch 21 such as a rotary switch.
, One is selectively switched and connected. The example of FIG. 1 shows a state where the transmission device 9b is connected to the relay control terminal unit 7.

The relay control terminal unit 7
Is connected to a hand switch 23 having an ON switch and an OFF switch. When the changeover switch 21 is connected to the transmission device 9c, for example, when the on switch of the hand switch 23 is closed, the analog signal is converted into a digital signal by the relay control terminal unit 7 and input to the transmission device 9c. You. Thereby, the transmission device 9c detects that the hand switch 23 has been turned on, and the relay control terminal unit 7
Sends a control signal to turn on all remote control relays 5a, 5b, 5c and 5d. Similarly, changeover switch 2
Even when 1 is connected to the transmission device 9a or 9b, the on / off signal from the hand switch 23 is processed in the same manner.

The switch 21 selectively connects the transmission devices 9a, 9b, and 9c to the relay control terminal unit 7 to turn on the four lighting fixtures 3 with different lighting pattern signals. Switching is possible. Note that the lighting pattern referred to here means that the first lighting pattern is lighting two units, the second lighting pattern is lighting three units, and the third lighting pattern is lighting four units.

On the other hand, when n out of the four units are turned off as in the case of the transmission devices 9a and 9b, the four lighting fixtures 3 are turned off so that the lighting times are the same. A rotation switching signal for sequentially changing the lighting equipment 3 is transmitted. This rotation switching signal is sent from the program timer device 11 described above.

In the case of a rotation in which two of the four lighting fixtures are turned off, if one cycle is, for example, 24 hours, switching is performed twice every 12 hours as shown in the rotation of two lights in FIG. As shown in FIG. 3 (a), a pair of luminaires 3 located on two orthogonal diagonal lines are alternately turned on.

On the other hand, when one of the four lighting fixtures is turned off by the transmission device 9b, for example, one hour is required for 24 hours.
In the case of a cycle, switching is performed four times every six hours as shown in the three-unit rotation in FIG. In this case, the lighting pattern signal is divided into four patterns in which the lighting fixtures 3 to be turned off are sequentially located at different positions, as shown in FIG. In this way, when one set of four lighting fixtures 3 is turned off and the illuminance is secured, and the illuminance is reduced to the required minimum illuminance for T = 2000 hours in this state, the above equation ｛(S −n) / S｝ × T, {(4-1) /
4｝ 2000 = 1500, and the lighting fixtures 3 in the turned-off state are sequentially replaced so that the lighting time of one lighting fixture 3 is 1500 hours.

The changeover switch 21 is provided in a manager's office or the like, and the switching time is assumed by a simulation and does not become a complicated operation (it becomes an operation about once or twice a year). In order not to complicate the device 1, it is preferable to use a manual switch.

In order to automate the changeover switch 21, it is preferable to use a central monitoring panel or the like provided in the facility. For example, a wattmeter with a pulse transmitter is attached to the mains of a light, the amount of used power is output to a central monitoring panel, and switching control is performed so that the back-calculated usage time matches the value of the simulation. According to this, automatic switching can be performed with high accuracy according to the electric power used.

The timer circuit vii shown in FIG. 4 is employed as a control for improving low illuminance immediately after lighting of the lighting equipment during the rotation shown in FIG. 3B.
That is, at the time of rotation switching, before turning off the lighting fixture 3 to be turned off, the lighting fixture 3 which has been turned off until now is used.
Is turned on in advance, and when the illuminance reaches a predetermined illuminance, the lighting fixture 3 to be turned off is turned off. As a result, immediately after the rotation is switched, the decrease in illuminance due to one of the three units being in the lighting initial state is corrected.

Next, a method of lighting a conventional lighting device and a method of lighting a lighting device using the lighting device 1 according to the present invention will be described by simulation. FIG. 5 is a graph showing the correlation between the illuminance and the replacement time when only all four lights are turned on, and FIG. 6 is a graph showing the correlation between the illuminance and the replacement time when all three lights are turned on and all four lights are turned on. 7 is a graph showing the correlation between the illuminance and the replacement time when two, three, and all four lamps are turned on.

[0035]

[Table 2]

First, as shown in Table 2, a conventional example (A plan)
In order to secure the required minimum illumination of 350 lux,
The lighting of all the units is performed. The life of the lighting equipment 3 used here is 9000 hours, the lamp replacement time is 9000 hours,
The amount of power per 400 W is 3600 kW · h, and the average power is 400 W. Therefore, as shown in the lower part of all four lighting columns of Table 2, in this lighting method, the life is 9000 hours, the lamp replacement time is 9000 hours, the electric energy per 400 W is 3600 kW · h, 3 and the correlation between illuminance and lamp replacement time
As shown in FIG. In this case, the initial illuminance is 701 lux, which is much higher than the required minimum illuminance of 350 lux.

[0037]

[Table 3]

On the other hand, as an example of the lighting method according to the present invention, Table 3 shows a case in which, for example, three units are rotated and all four units are turned on (plan B). In this lighting method, first, as shown in FIG.
The lighting fixtures 3 are turned on, and the initial illuminance is suppressed to 525 lux. In the three-unit lighting, the illuminance is reduced to 352 lux near the required minimum illuminance after the single use time of 3750 hours has elapsed. Therefore, at this point, the stage switching is performed to all the four units shown in FIG. In the case of the lighting fixture 3 in which the single use time has passed 3750 hours, illuminance of 470 lux is secured by turning on all four lighting fixtures. In a state where these four units are all lit, the unit is used until the unit use time reaches 9000 hours.

The lamp replacement time is 5,000 hours when three lamps are rotated, and 5250 hours when all four lamps are turned on, so that the total time is 10250 hours. FIG. 6 shows the correlation between the illuminance and the lamp replacement time. Therefore, the average power becomes 351 kW by turning off one unit as compared with the plan A.

[0040]

[Table 4]

Further, as another example of the lighting method according to the present invention, if it is acceptable that the required minimum illuminance is slightly less than 350 lux (for example, about 310 lux), as shown in Table 4, the two devices are turned on. Further, it is possible to incorporate it into rotation (plan C). In this lighting method, first, the two lighting fixtures 3 are turned on by the two-rotation shown in FIG. 3A, and the initial illuminance is suppressed to 350 lux. With these two units lit, the unit usage time is 10
After the elapse of 00 hours, the illuminance decreases to 310 lux. At this point, the stage switching is performed to all the three lamps shown in FIG. In the case of the lighting fixture 3 in which the single use time has passed 1000 hours, illuminance of 465 lux is secured by turning on all three lighting fixtures. In a state where all three units are lit, the illuminance is reduced to 310 lux when the single use time passes 5400 hours.
At this point, the stage switching is performed to all the four lamps shown in FIG. In the case of the lighting fixture 3 in which the single use time has passed 5400 hours, illuminance of 414 lux is secured by turning on all four lighting fixtures. In a state in which all four units are lit, the unit is used until the unit usage time reaches 9000 hours.

The lamp replacement time is 2000 hours when rotating two lamps, and 586 when rotating three lamps.
Since it is 7 hours and 3600 hours when all four units are lit, the total is 11,467 hours. The correlation between the illuminance and the lamp replacement time is as shown in FIG. Therefore, two units can be turned off as compared to plan A,
The average power is 314 kW.

As a result, as shown in Table 5 below, the lamp replacement time was 9000 hours for the plan A and 10250 hours for the plan B.
It can be seen that the time (extended by 1250 hours) is extended to 11467 hours (extended by 2467 hours) in the case C. The average power is 400W for one metal halide lamp.
On the other hand, 400W for Plan A and 351 (12.5
% Energy saving) and 314 W (21.3% energy saving) in the C plan. Then, the initial cost increases in the order of the plan B and the plan C, but the running cost decreases in the reverse. In the case of the plan C, the increase in the initial cost can be recovered in 1.5 years.

[0044]

[Table 5]

According to the lighting method of the lighting equipment using the above-described lighting device 1, at the time of the initial illuminance in which a high illuminance is secured,
Lighting equipment 3 which is turned on at the same time among a set of lighting equipment S
Are illuminated by reducing the number to the number S−n at which the required minimum illuminance is secured. Therefore, in this state, conventionally, the n illuminated lighting devices 3 are turned off, and accordingly, excessive illuminance is reduced and energy saving is achieved. And Sn
When the illuminance of the three luminaires 3 decreases to the required minimum illuminance as the lighting time elapses, the lighting is performed by the (Sn + 1) units, and the required minimum illuminance is secured. Similarly, when the illuminance of the luminaire 3 is reduced to the required minimum illuminance thereafter, n luminaires 3 are sequentially added one by one, and finally all the lamps of the S luminaires are turned on. As a result, glare and unnecessary power consumption due to the lighting of all the S units at the time of the initial illuminance are prevented, and the required minimum illuminance is always secured (that is, the initial illuminance correction). In addition, the life of the lighting device 3 can be delayed as compared with the case where the lighting device 3 is used continuously, and the time for replacing the lighting device can be extended.

Also, while the S-n lighting fixtures 3 are turned on for T hours and the illuminance decreases to the required minimum illuminance, the lighting time of each of the S lighting fixtures 3 is ｛(Sn) / S The lighting fixtures 3 in the off state among the S lighting fixtures 3 are sequentially replaced so that｝ × T. Thus, the lighting devices 3 in the set of S units have the same lighting time. For example,
When a set of four lighting fixtures is turned on and three illuminators are turned on to secure the illuminance, and in this state the lighting is turned on for T = 2000 hours and the illuminance drops to the required minimum illuminance, {(4-1) / 4} × 20
00 = 1500, and the lighting fixtures in the light-off state are sequentially replaced such that the lighting time of one lighting fixture 3 is 1500 hours. Thereby, the life of the lighting fixture 3 is made uniform, and simultaneous replacement at the time of maintenance can be realized.

Further, in the above embodiment, four luminaires 3 are arranged on the diagonal at right angles, one pair at an equal distance from the intersection. That is, four lighting fixtures 3 are arranged at each corner of the square. And
A set of four luminaires 3 arranged in the same manner is continuously arranged vertically and horizontally. Therefore, the number n of lighting fixtures 3 to be turned off
Is 1 or 2, it is possible to avoid consecutively turning off two adjacent lighting fixtures 3 in the entire lighting fixture array. Thereby, a uniform light distribution can be achieved.

[0048]

As described above in detail, according to the lighting method of the lighting equipment according to the present invention, the lighting equipment which is simultaneously lighted out of the set of S units at the time of the initial illuminance in which the high illuminance is secured. Is reduced to a number of S-n units at which the required minimum illuminance is secured, and when the illuminance of the S-n lighting devices decreases to the required minimum illuminance as the lighting time elapses, S-n +
The required minimum illuminance is secured by performing lighting with one unit. Similarly, when the illuminance of the luminaire is reduced to the required minimum illuminance, the illuminators are sequentially added up to n units one by one and finally S Since all the lights in one set are turned on, it is possible to prevent glare and unnecessary power consumption caused by turning on all the lights in the S stage at the time of initial illuminance, and to secure the required minimum illuminance (ie, initial illuminance correction). Thus, the lighting fixture can be turned on with high efficiency.

According to the lighting device of the present invention, S
Number S for which the required minimum illuminance is secured among a set of lighting fixtures
-From n units, add up to n units one by one and finally add S
A plurality of transmission devices that transmit stepwise different lighting pattern signals to turn on all lights in a set, and a relay control that simultaneously activates relays corresponding to the lighting pattern signals by inputting lighting pattern signals from this transmission device A terminal unit is provided, and an arbitrary lighting pattern signal is selected from a plurality of transmission devices by a changeover switch and input to the relay control terminal unit, so that the lighting fixture whose illuminance decreases as the lighting time elapses. Even in the case of using, it is possible to select a lighting pattern in which an optimal number of lighting fixtures are turned on in accordance with a decrease in illuminance, and it is possible to select dazzling or unnecessary illumination at the time of initial illuminance where a high illuminance is secured. Power consumption can be prevented, the lighting fixture can be turned on with high efficiency, and energy can be saved.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a schematic configuration of a lighting device according to the present invention.

FIG. 2 is a block diagram showing an example of system division of a lighting fixture group.

FIG. 3 is an explanatory diagram showing an example of rotation switching and an example of stage switching in the example of system division in FIG. 2;

FIG. 4 is a time chart showing a specific example of rotation switching shown in FIG. 3;

FIG. 5 is a graph showing the correlation between the illuminance and the replacement time when only all four units are turned on.

FIG. 6 is a graph showing a correlation between illuminance and replacement time when all three units are turned on and all four units are turned on.

FIG. 7 Rotation of 2 units, rotation of 3 units and 4 units
It is a graph showing the correlation between the illuminance and the replacement time when all the units are turned on.

FIG. 8 is a graph showing a relationship between a luminous flux maintenance factor and a use time of a metal halide lamp.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Lighting device, 3 ... Lighting equipment, 5a, 5b, 5c, 5d
... Remote control relay (relay), 7 ... Relay control terminal unit, 9a, 9b, 9c ... Transmission device, 11 ... Program timer device, 21 ... Switch

Claims (5)

[Claims] 1. A plurality of luminaires whose illuminance gradually decreases as the lighting time elapses are arranged as a set of S units, and at the time of initial illuminance at which a high illuminance is ensured, the luminaires of the set of S units are used simultaneously. The number of the lighting fixtures to be turned on is reduced to a number S−n where the required minimum illuminance is secured, and the lighting fixtures are turned on. In the same manner, when the illuminance of the lighting fixtures has decreased to the required minimum illuminance, lighting fixtures are sequentially added to each of the n lighting fixtures, and finally the S lighting fixtures are used. A lighting method of a lighting fixture, characterized by lighting a set of lighting fixtures. 2. When the time when the Sn lighting devices are turned on to the required minimum illuminance is T, the lighting time of each of the S lighting devices is {(Sn) / S}.
2. The lighting fixtures in the turned-off state among the S lighting fixtures are sequentially changed so as to be xT.
The lighting method of the lighting fixture described. 3. The S luminaires are four, and the four luminaires are arranged on orthogonal diagonals, respectively.
The lighting method for a lighting fixture according to claim 1 or 2, wherein a pair of the lighting fixtures are arranged at an equal distance from the intersection. 4. The illuminance gradually decreases as the lighting time elapses, and a plurality of luminaires arranged in a set of S units and luminaires arranged at a common position in each set are connected to each other.
At least S relays that are connected to each of the lighting fixture groups divided into systems, and a lighting fixture from a number Sn of the set of S lighting fixtures that ensures the required minimum illuminance. When the illuminance decreases to the required minimum illuminance, a plurality of transmissions for sequentially transmitting different lighting pattern signals for sequentially adding up to n lighting fixtures for each lighting fixture and finally lighting a set of S lighting fixtures are performed. A device, a relay control terminal unit that simultaneously activates the relays of the lighting fixture group corresponding to the lighting pattern signal when a lighting pattern signal from the transmission device is input, and a plurality of the transmission devices. A changeover switch for selecting a lighting pattern signal in any one of the transmission devices and inputting it to the relay control terminal unit. . 5. The Sn selected by the transmission device.
When the time when the lighting fixtures are turned on to the required minimum illuminance is T, the S lighting fixtures are set such that the lighting time of each of the S lighting fixtures becomes {(Sn) / S} × T. 5. The lighting device according to claim 4, further comprising a program timer device for transmitting a rotation switching signal for sequentially changing the lighting devices in a light-off state among the lighting devices.