JP2008243456A - Lighting device - Google Patents

Abstract

Power saving is achieved while eliminating a time difference until a necessary illuminance is ensured.
A lighting device includes a fluorescent lamp lighting circuit unit 1 that turns on a fluorescent lamp La1 when power is supplied from a commercial AC power supply AC, and an incandescent lamp La2 that is an auxiliary light source by controlling energization from the commercial AC power supply AC. Detection results of an incandescent lamp lighting circuit unit 2 that switches between turning on and off, a human body detection circuit unit 3 that detects the presence of a person in the detection area, an illuminance detection circuit unit 4 that detects ambient illuminance, and a human body detection circuit unit 3 And a fluorescent lamp control circuit unit 5 that outputs a control signal to the fluorescent lamp lighting circuit unit 1 according to the ambient illuminance detected by the illuminance detection circuit unit 4. During the preceding preheating period of the fluorescent lamp La1, it is possible to eliminate the time difference until the necessary illuminance is ensured by turning on the incandescent lamp La2, which is an auxiliary light source. Furthermore, by turning off the incandescent lamp La2 after the fluorescent lamp La1 starts and shifts to a stable lighting state, wasteful power consumption can be eliminated and power saving can be achieved.
[Selection] Figure 1

Description

  The present invention relates to a lighting device.

  In general, when a fluorescent lamp with a preheated electrode is lit, it takes a period of time to preheat the fluorescent lamp electrode. Therefore, after the event to turn on the fluorescent lamp occurs, the fluorescent lamp is actually turned on and the required illuminance There is a time difference of about several seconds at the maximum before it can be secured. As a lighting device that solves such problems, a fluorescent lamp lighting circuit unit that lights a fluorescent lamp in response to a lighting signal, an incandescent lamp lighting circuit unit that lights an incandescent lamp in response to the lighting signal, and a human body that detects a human body When a human body is detected by the human body detection unit, including a detection unit and a control unit that receives a human body detection signal from the human body detection unit and outputs a lighting signal or a turn-off signal to the fluorescent lamp lighting circuit unit and the incandescent lamp lighting circuit unit In addition, it has been proposed that the control unit first turns on the incandescent lamp and turns on the fluorescent lamp after sufficiently preheating (see, for example, Patent Document 1 and Patent Document 2).

That is, in the above-described conventional apparatus, the time difference until the necessary illuminance is ensured can be substantially eliminated by turning on the incandescent lamp during the preceding preheating period of the fluorescent lamp.
JP-A-9-199279 Japanese Patent Laid-Open No. 2000-100543

  By the way, in the above conventional example, the incandescent lamp is continuously turned on after the fluorescent lamp is turned on, and the incandescent lamp is also turned off at the same time when the fluorescent lamp is turned off. For this reason, even when the necessary illuminance can be ensured only with the fluorescent lamp, there is a problem that unnecessary electric power is consumed by turning on the incandescent lamp.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an illuminating device that can save power while eliminating a time difference until a necessary illuminance is ensured.

  In order to achieve the above object, the invention of claim 1 is a fluorescent lamp lighting means for lighting a fluorescent lamp with a preheating electrode, and an auxiliary light source other than the fluorescent lamp in a time shorter than a preheating period by the fluorescent lamp lighting means. Auxiliary light source lighting means, and fluorescent lamp lighting means and control means for instructing the auxiliary light source lighting means to turn on / off the fluorescent lamp and the auxiliary light source. The control means includes the fluorescent lamp lighting means and the auxiliary light source. The lighting unit is instructed to be turned on at the same time, and the auxiliary light source lighting unit is instructed to be turned off after the fluorescent lamp is started and shifted to a stable lighting state.

  The invention of claim 2 comprises the human body detection means for detecting the presence of a person in the detection area according to the invention of claim 1, and the control means includes a period during which the presence of a person is detected by the human body detection means and the period. The fluorescent lamp lighting means is instructed to turn on during a period until a predetermined lighting holding time elapses.

  According to a third aspect of the present invention, in the second aspect of the present invention, when the lighting holding time has elapsed, the control means instructs the fluorescent lamp lighting means to turn off, and turns on the auxiliary light source lighting means for a certain period of time. It is characterized by instructing.

  The invention of claim 4 is the invention of any one of claims 1 to 3, further comprising life detecting means for detecting the life of the fluorescent lamp, and the control means detects the end of life of the fluorescent lamp by the life detecting means. The auxiliary light source lighting means is sometimes instructed to turn on.

  According to a fifth aspect of the invention, there is provided the illuminance detection means for detecting the ambient illuminance in the invention of the third aspect, wherein the control means is an auxiliary light source when the ambient illuminance detected by the illuminance detection means is not more than a predetermined threshold value. When lighting is instructed to the lighting means, and the ambient illuminance is less than or equal to a threshold value, in the period during which the presence of a person is detected by the human body detection means and the period until the predetermined lighting holding time elapses from the period The fluorescent lamp lighting means is instructed to turn on.

  According to the first aspect of the invention, the control means instructs the fluorescent lamp lighting means and the auxiliary light source lighting means to turn on simultaneously, and after the fluorescent lamp starts and shifts to a stable lighting state, the auxiliary light source lighting means Since the lamp is instructed to turn off, it is possible to eliminate the time difference until the required illuminance is secured by turning on the auxiliary light source during the pre-heating period of the fluorescent lamp, and the fluorescent lamp starts and shifts to a stable lighting state. Then, by turning off the auxiliary light source, unnecessary power consumption can be eliminated and power saving can be achieved.

  According to the invention of claim 2, the control means turns on the fluorescent lamp lighting means during the period in which the presence of the person is detected by the human body detection means and the period until the predetermined lighting holding time elapses from the period. Therefore, it is possible to save energy by performing illumination only while a person is present in the detection area.

  According to the invention of claim 3, the control means instructs the fluorescent lamp lighting means to turn off and the auxiliary light source lighting means to turn on for a certain period of time when the lighting holding time elapses. Usability can be improved by turning on the auxiliary light source for a certain period of time even after there are no people in the area.

  According to the invention of claim 4, the life detecting means for detecting the life of the fluorescent lamp is provided, and the control means instructs the auxiliary light source lighting means to turn on when the life detecting means detects the end of the life of the fluorescent lamp. Therefore, it is possible to notify the user that the fluorescent lamp has reached the end of its life by turning on the auxiliary light source and prompt the user to replace the fluorescent lamp.

  According to the invention of claim 5, the control means instructs the auxiliary light source lighting means to turn on when the ambient illuminance detected by the illuminance detection means is less than or equal to a predetermined threshold, and the ambient illuminance is the threshold. If it is less than the value, the fluorescent lamp lighting means is instructed to turn on during the period when the presence of the person is detected by the human body detecting means and the predetermined lighting holding time elapses from that period. Energy saving can be achieved by illuminating only when it is below the threshold.

(Embodiment 1)
As shown in FIG. 1, the illumination device of the present embodiment controls the energization from the fluorescent lamp lighting circuit unit 1 that receives power from the commercial AC power supply AC and lights the fluorescent lamp La1, and the commercial AC power supply AC. An incandescent lamp lighting circuit unit 2 that switches on / off of the incandescent lamp La2 as an auxiliary light source, a human body detection circuit unit 3 that detects the presence of a person in the detection area, an illuminance detection circuit unit 4 that detects ambient illuminance, and a human body detection A fluorescent lamp control circuit unit 5 that outputs a control signal to the fluorescent lamp lighting circuit unit 1 according to the detection result of the circuit unit 3 and the ambient illuminance detected by the illuminance detection circuit unit 4 is provided.

  The fluorescent lamp lighting circuit unit 1 is a so-called fluorescent lamp electronic ballast, and includes, for example, an inverter composed of a semiconductor switching element and a choke coil, a capacitor and the like. By changing the switching frequency, the fluorescent lamp La1 is started and lit through the operation modes of the preceding preheating mode, the start mode, and the lighting mode. However, since such a fluorescent lamp electronic ballast is well known in the art, a detailed configuration and illustration and explanation of its operation are omitted.

  The incandescent lamp lighting circuit unit 2 includes, for example, a switch element inserted in a power supply path from the commercial AC power supply AC to the incandescent lamp La2, and the incandescent lamp La2 from the commercial AC power supply AC is turned on / off. The incandescent lamp La2 is turned on and off by turning on / off the power supply to the lamp. The switch element is turned on when the signal output from the signal output terminal 1a provided in the fluorescent lamp lighting circuit unit 1 (hereinafter referred to as an incandescent lamp lighting signal) is at a high level and closes the power feeding path. When the incandescent lamp lighting signal is at a low level, the power supply path is opened by turning off.

  The human body detection circuit unit 3 detects a human body by detecting a heat ray (infrared ray) radiated from the human body with a pyroelectric element and detects a human body as a high level, and detects a human body as a low level. This signal (hereinafter referred to as a human body detection signal) is output to the fluorescent lamp control circuit unit 5.

  The ambient illuminance detection circuit unit 4 converts light into an electric signal by a photoelectric conversion element such as a solar cell, and a signal having a level corresponding to the intensity of light (ambient illuminance) (hereinafter referred to as an illuminance detection signal). ) Is output to the fluorescent lamp control circuit unit 5.

  The fluorescent lamp control circuit unit 5 includes, for example, a microcomputer as a main component, and neither the fluorescent lamp La1 nor the incandescent lamp La2 is lit while the illuminance detection signal exceeds a predetermined threshold value. However, when the human body detection signal becomes high level when the illuminance detection signal is equal to or lower than the threshold value, a control signal (high level signal) instructing the fluorescent lamp control circuit unit 5 to turn on the fluorescent lamp La1. When a predetermined lighting holding time elapses after the human body detection signal becomes low level, a control signal (low level signal) instructing to turn off the fluorescent lamp La1 is output.

  In the fluorescent lamp lighting circuit unit 1, when the control signal input from the fluorescent lamp control circuit unit 5 rises from a low level to a high level, the inverter control circuit (not shown) causes the resonance frequency of the resonance circuit including the fluorescent lamp La1 and the choke coil and capacitor. The semiconductor switching element is switched at a frequency higher than (no-load resonance frequency) and pre-preheating is performed for a certain period (hereinafter referred to as pre-preheating period) (preceding preheating mode). When the preceding preheating period has elapsed, the inverter control circuit applies a starting voltage to the fluorescent lamp La1 by lowering the switching frequency of the semiconductor switching element in a direction approaching the resonance frequency (starting mode), and the fluorescent lamp La1 is started. Then, the fluorescent lamp La1 is stably lit by switching the semiconductor switching element at a predetermined frequency (lighting frequency) higher than the resonance frequency at the time of lighting (lighting mode). Here, in the inverter control circuit, the incandescent lamp lighting signal output from the signal output terminal 1a is raised to high level in synchronization with the rising of the control signal input from the fluorescent lamp control circuit unit 5, and the lighting mode is shifted to the lighting mode. After a certain period of time, the incandescent lamp lighting signal is set to low level.

  Next, the operation of this embodiment will be described with reference to the time chart of FIG.

  While the illuminance detection signal exceeds the threshold value, the fluorescent lamp control circuit unit 5 does not output a control signal for instructing lighting of the fluorescent lamp La1 even if the human body detection signal becomes high level (˜t1). If the human body detection signal becomes high level when the illuminance detection signal is equal to or lower than the threshold value (t2), a high level control signal that instructs the fluorescent lamp lighting circuit unit 1 to turn on the fluorescent lamp La1. Is output. When a high level control signal is input from the fluorescent lamp control circuit unit 5, the fluorescent lamp lighting circuit unit 1 starts an inverter control circuit and simultaneously outputs a high level incandescent lamp lighting signal from the signal output terminal 1a. In the incandescent lamp lighting circuit unit 2 to which the high-level incandescent lamp lighting signal is input, the incandescent lamp La2 fed from the commercial AC power supply AC is immediately turned on by turning on the switch element. Further, the inverter control circuit pre-heats the electrodes of the fluorescent lamp La1 in the pre-heating mode when a predetermined time elapses from the start (t3), and when the pre-heating period elapses, shifts to the start mode and starts the fluorescent lamp La1 (t4). Then, when the fluorescent lamp La1 is started, the lighting mode is entered and the fluorescent lamp La1 is stably lit (t5). If the light output of the fluorescent lamp La1 during stable lighting is 100%, in the start mode, the light output of the fluorescent lamp La1 from starting to stable lighting is about 60%. Further, when a predetermined time elapses after shifting to the lighting mode, the inverter control circuit lowers the incandescent lamp lighting signal to a low level, turns off the switch element of the incandescent lamp lighting circuit unit 2, and extinguishes the incandescent lamp La2 (t6). ).

  That is, from time t2 to t6, the light output of the lighting device can be increased stepwise to obtain a desired illuminance. Further, in the preceding preheating period (t3 to t4) of the fluorescent lamp La1, the time difference until the fluorescent lamp La1 is turned on can be eliminated by turning on the incandescent lamp La2.

  On the other hand, when a predetermined lighting holding time has elapsed from the time when the human body detection signal falls to the low level, the fluorescent lamp control circuit unit 5 sends a low level control signal for instructing the fluorescent lamp La1 to be turned off. (T7). In the fluorescent lamp lighting circuit unit 1, when a low level control signal is input, the inverter control circuit outputs a high level incandescent lamp lighting signal from the signal output terminal 1a, and the incandescent lamp La2 is immediately lit (t7). Then, the inverter control circuit stops switching of the semiconductor switching element and turns off the fluorescent lamp La1 when a predetermined time has elapsed after outputting the high level incandescent lamp lighting signal (t8). Further, when a predetermined time elapses after the fluorescent lamp La1 is turned off, the inverter control circuit lowers the incandescent lamp lighting signal to a low level and the incandescent lamp La2 is turned off (t9).

  That is, since the light output of the lighting device gradually decreases and finally becomes zero at times t7 to t9, inconvenience due to sudden turn off of the illumination can be reduced.

  As described above, according to the present embodiment, it is possible to eliminate the time difference until the necessary illuminance is ensured by turning on the incandescent lamp La2, which is the auxiliary light source, in the preceding preheating period of the fluorescent lamp La1, and further, the fluorescent lamp By turning off the incandescent lamp La2 after La1 starts and shifts to a stable lighting state, wasteful power consumption can be eliminated and power saving can be achieved.

  By the way, when the emitter (thermionic emission material) applied to the electrode is consumed and the fluorescent lamp La1 reaches the end of its life, the fluorescent lamp La1 enters an abnormal discharge state called so-called half-wave discharge. Therefore, a function (life detection function) for detecting such an abnormal discharge state is installed in the inverter control circuit, and when the abnormal discharge is detected, that is, when the fluorescent lamp La1 reaches the end of its life, the inverter control circuit goes high. If the incandescent lamp La2 is lit by outputting a level incandescent lamp lighting signal, it is possible to notify the user that the fluorescent lamp La1 has reached the end of its life and prompt the user to replace the fluorescent lamp La1.

(Embodiment 2)
As shown in FIG. 3, the illuminating device of this embodiment includes a fluorescent lamp lighting circuit unit 10 that lights a fluorescent lamp La1, and a power supply control circuit that turns on / off the power supply from the commercial AC power supply AC to the fluorescent lamp lighting circuit unit 10. Unit 11, an auxiliary light source unit 12 composed of a plurality of white light emitting diodes, an auxiliary light source lighting circuit unit 13 for driving the light emitting diodes to light the auxiliary light source unit 12, and detecting the presence of a person in the detection area A human body detection circuit unit 14 and an illuminance detection circuit unit 15 for detecting ambient illuminance are provided.

  The fluorescent lamp lighting circuit unit 10 inputs a diode bridge DB for full-wave rectification of an AC voltage supplied from the commercial AC power supply AC via the power supply control circuit unit 11, and a pulsating voltage that is full-wave rectified by the diode bridge DB. A step-up chopper circuit CH for improving the power factor to be a voltage and two semiconductor switching elements Q2 and Q3 are connected between the output ends of the step-up chopper circuit CH, and a DC cut is made between the source and drain of the low-side semiconductor switching element Q3. The half-bridge inverter circuit INV to which the fluorescent lamp La1 and the preheating capacitor Cm are connected via the capacitor C and the choke coil L, and the semiconductor switching element Q1 constituting the step-up chopper circuit CH are PWM-controlled to achieve a desired direct current. The output voltage is applied to the inverter circuit INV and the inverter circuit INV A control circuit unit for starting and lighting the fluorescent lamp La1 through the operation modes of the preceding preheating mode, the starting mode and the lighting mode by alternately switching the two semiconductor switching elements Q2 and Q3 constituting and changing the switching frequency 16. However, the boost chopper circuit CH and the half-bridge inverter circuit INV are well known in the art and will not be described in detail.

  The control circuit unit 16 includes a microcomputer as a main component, and further includes a regulator (not shown) that steps down the DC output voltage of the step-up chopper circuit CH to create a control voltage of about 10 to 5V. The control voltage created by the regulator is supplied to the auxiliary light source lighting circuit unit 13 through the electrolytic capacitor C0.

  The auxiliary light source lighting circuit unit 13 turns on the auxiliary light source unit 12 by applying the control voltage supplied from the control circuit unit 16 and turns off the auxiliary light source unit 12 by stopping the application of the control voltage. . The auxiliary light source lighting circuit unit 13 supplies a control voltage to the auxiliary light source unit 12 when a signal (hereinafter referred to as an LED lighting signal) output from a signal output terminal 16a provided in the control circuit unit 16 is at a low level. When the LED lighting signal is at a high level, the control voltage is not applied to the auxiliary light source unit 12.

  The illuminance detection circuit unit 15 converts light into an electrical signal by a photoelectric conversion element such as a solar cell, and outputs an illuminance detection signal of a level corresponding to the intensity of light (ambient illuminance) to the power supply control circuit unit 11. Yes.

  The power control circuit unit 11 turns off the power supply from the commercial AC power supply AC to the fluorescent lamp lighting circuit unit 10 while the illuminance detection signal exceeds a predetermined threshold, and the illuminance detection signal is equal to or less than the threshold. During this time, the power supply from the commercial AC power supply AC to the fluorescent lamp lighting circuit unit 10 is turned on.

  The human body detection circuit unit 14 detects a human body by sensing a heat ray (infrared ray) radiated from the human body with a pyroelectric element, and at a high level when the human body is detected, and a low level when the human body is not detected. The human body detection signal is input from the sensor unit 14a when the power supply control circuit unit 11 is turning on the power supply from the commercial AC power supply AC to the fluorescent lamp lighting circuit unit 10. A lighting signal output unit 14b that outputs a high level lighting signal to the control circuit unit 16 for a predetermined lighting holding time.

  Next, the operation of this embodiment will be described with reference to the time chart of FIG.

  In the power supply control circuit unit 11, since the power supply from the commercial AC power supply AC to the fluorescent lamp lighting circuit unit 10 is turned off while the illuminance detection signal exceeds the threshold value, the fluorescent lamp La1 remains off, Since the control voltage is not supplied from the control circuit unit 16, the auxiliary light source unit 12 remains off. When the illuminance detection signal falls below the threshold value (t1), the power supply control circuit unit 11 turns on the power supply from the commercial AC power supply AC to the fluorescent lamp lighting circuit unit 10, so that the control circuit unit 16 is activated. A low-level control voltage (= 5 V) is output, and the control voltage is applied to the auxiliary light source unit 12 via the auxiliary light source lighting circuit unit 13 so that the auxiliary light source unit 12 is half of the rated lighting (50%). Lights with the light output of. When the control voltage is supplied, the human body detection circuit unit 14 operates, and when a human body detection signal is output from the sensor unit 14a, a high level lighting signal is output from the lighting signal output unit 14b to the control circuit unit 16. (T2). When a high-level lighting signal is input, the control circuit unit 16 starts up the boost chopper circuit CH, then starts up the inverter circuit INV, and pre-heats the electrodes of the fluorescent lamp La1 in the pre-heating mode (t3). When the step-up chopper circuit CH is activated, the control circuit unit 16 outputs a high level control voltage (= 10 V), so that the control voltage is applied to the auxiliary light source unit 12 via the auxiliary light source lighting circuit unit 13 to assist. The light source unit 12 is lit at a rated level (100% lit). When the preceding preheating period elapses, the control circuit unit 16 shifts to the start mode and starts the fluorescent lamp La1 (t4), and further shifts to the lighting mode when the fluorescent lamp La1 starts to stably light the fluorescent lamp La1 (t5). ). If the light output of the fluorescent lamp La1 during stable lighting is 100%, in the start mode, the light output of the fluorescent lamp La1 from starting to stable lighting is about 60%. Further, when a predetermined time elapses after shifting to the lighting mode, the control circuit unit 16 raises the LED lighting signal to a high level, stops the auxiliary light source lighting circuit unit 13 and turns off the auxiliary light source unit 12 (t6).

  That is, when the ambient illuminance decreases and falls below the threshold value, the auxiliary light source unit 12 is turned on with half the light output at the time of rated lighting (t1 to t2), and then a lighting device is detected when a person is detected in the detection area The light output can be increased stepwise to obtain a desired illuminance. Further, in the preceding preheating period (t3 to t4) of the fluorescent lamp La1, the auxiliary light source unit 12 is turned on so that the time difference until the fluorescent lamp La1 is turned on can be eliminated.

  On the other hand, when a predetermined lighting holding time has elapsed from the time when the human body detection signal falls to the low level, a low level lighting signal is output from the lighting signal output unit 14b to the control circuit unit 16 (t7). When a low level lighting signal is input, the control circuit unit 16 lowers the LED lighting signal to a low level and immediately turns on the auxiliary light source unit 12 at rated power (t7). Then, the control circuit unit 16 stops the inverter circuit INV and the step-up chopper circuit CH and turns off the fluorescent lamp La1 after a predetermined time has elapsed after outputting the low level LED lighting signal (t8). When the step-up chopper circuit CH is stopped, the control voltage becomes a low level, so that the auxiliary light source unit 12 is turned on with a light output that is half that of the rated lighting. Further, when the illuminance detection signal exceeds the threshold value, the power supply control circuit unit 11 turns off the power supply from the commercial AC power supply AC to the fluorescent lamp lighting circuit unit 10, so that the control voltage is not supplied from the control circuit unit 16. The auxiliary light source unit 12 is turned off (t9).

  That is, since the light output of the lighting device gradually decreases and finally becomes zero at times t7 to t9, inconvenience due to sudden turn off of the illumination can be reduced.

  As described above, according to the present embodiment, in the preceding preheating period of the fluorescent lamp La1, it is possible to eliminate the time difference until the necessary illuminance is ensured by turning on the auxiliary light source unit 12, and further, the fluorescent lamp La1 By turning off the auxiliary light source unit 12 after starting and shifting to a stable lighting state, wasteful power consumption can be eliminated and power saving can be achieved.

  As in the first embodiment, the end of life detection function of the fluorescent lamp La1 is mounted on the control circuit unit 16, and when an abnormal discharge is detected, that is, when the fluorescent lamp La1 reaches the end of life, the control circuit unit 16 The auxiliary light source unit 12 may be turned on by outputting a low-level LED lighting signal from the LED to notify the user that the fluorescent lamp La1 has reached the end of its life and prompt the user to replace the fluorescent lamp La1. .

It is a circuit block diagram which shows Embodiment 1 of this invention. It is a time chart for operation | movement description same as the above. It is a circuit block diagram which shows Embodiment 2 of this invention. It is a time chart for operation | movement description same as the above.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fluorescent lamp lighting circuit part 2 Incandescent lamp lighting circuit part 3 Human body detection circuit part 4 Ambient illumination detection circuit part 5 Fluorescent lamp control circuit part La1 Fluorescent lamp La2 Incandescent lamp AC Commercial AC power supply

Claims (5)

A fluorescent lamp lighting means for lighting a fluorescent lamp with a preheating electrode, an auxiliary light source lighting means for lighting an auxiliary light source other than the fluorescent lamp in a time shorter than a preheating period by the fluorescent lamp lighting means, a fluorescent lamp lighting means and an auxiliary lamp Control means for instructing the light source lighting means to turn on / off the fluorescent lamp and the auxiliary light source,
The control means instructs the fluorescent lamp lighting means and the auxiliary light source lighting means to turn on at the same time, and instructs the auxiliary light source lighting means to turn off after the fluorescent lamp starts and shifts to a stable lighting state. Lighting device. Equipped with human body detection means for detecting the presence of a person in the detection area,
The control means instructs the fluorescent lamp lighting means to turn on in a period during which the presence of a person is detected by the human body detection means and a period until a predetermined lighting holding time elapses from the period. Item 2. The lighting device according to Item 1.   3. The lighting device according to claim 2, wherein the control means instructs the fluorescent lamp lighting means to turn off when the lighting holding time has elapsed, and instructs the auxiliary light source lighting means to turn on for a certain period of time. . A life detection means for detecting the life of the fluorescent lamp is provided.
The lighting device according to any one of claims 1 to 3, wherein the control means instructs the auxiliary light source lighting means to turn on when the life detecting means detects the end of life of the fluorescent lamp. With illuminance detection means for detecting ambient illuminance,
The control means instructs the auxiliary light source lighting means to turn on when the ambient illuminance detected by the illuminance detection means is less than or equal to a predetermined threshold, and if the ambient illuminance is less than or equal to the threshold, the human body detection means 4. The lighting device according to claim 3, wherein the lighting device is instructed to turn on the fluorescent lamp lighting means during a period in which the presence of a person is detected and a period until a predetermined lighting holding time elapses from the period.

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