JPH11317294A - Lighting control device and lighting system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate feeling of incongruity and unpleasantness by lessening difference of brightness in the periphery of the ceiling. SOLUTION: A lighting control device 2 of this lighting system 1 is composed of a control part 7 with a built-in microcomputer, a storage part 8 and a dimming signal generating part 9, then a light sensor 6 is connected with the control part 7. The light sensor 6 detects the brightness in the prescribed areas to input the detected result to the control part 7. A standard set value of the light sensor 6 and a lower limit value of the dimming signal are stored in the storage part 8. The control part 7 compares the detected output of the light sensor 6 with the standard set value of the light sensor 6 to send the difference to the dimming signal generating part 9. Then, the lower limit value of the dimming signal is read out to be sent. The dimming signal generating part 9 is connected with plural high-frequency lighting devices 3, 3, to send the dimming signal to them. The high-frequency lighting devices 3, 3 are respectively connected with discharge lamps 4, 4. The lighting devices 3, 3 and the discharge lamps 4, 4 are contained in a luminaire. The lighting system 5, 5 illuminate the prescribed areas, and the brightness of adjacent areas is dimmed so as to approximate to each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lighting control device and a lighting device for dimming a discharge lamp.

[0002]

2. Description of the Related Art For example, in stores and offices,
Some lighting devices automatically adjust the light so that the illuminance on the surface to be irradiated is kept constant even when the illuminance of the natural light or the external light by another lighting device changes. An illumination device of this type is described in, for example, JP-A-58-53186 (prior art). FIG. 6 is a block diagram of this conventional lighting device. A phase-controlled AC power is supplied from a commercial AC power supply 41 via a phase control device 42 to a lighting device 43 to which a discharge lamp such as a fluorescent lamp is connected. The phase control device 42 is controlled by the control device 44. The control device 44 includes an illuminance detector 4 that detects the actual illuminance of the surface to be illuminated.
5. an illuminance setting unit 46 for setting a target illuminance on the surface to be illuminated; a comparator 47 for comparing the target illuminance with the actual illuminance and outputting a deviation between the two illuminances; a control signal for controlling a lamp output so as to make the deviation zero. A dimming lower limit setting circuit 50 having a generating circuit 48 and a timer circuit 49 for setting a dimming lower limit value;
7 and a high value priority circuit 51 that outputs the larger signal of the deviation output from the output signal 7 and the setting output of the dimming lower limit setting circuit 50. Then, as shown in FIG. 7, the control device 44 controls the phase control device 42 so that the illuminance (curve A in the figure) of the irradiated surface is constant (target illuminance Lo). That is, the control device 44 calculates the illuminance of the surface to be illuminated (the curve B in the drawing) obtained by the illuminating device from the target illuminance Lo to the illuminance Ln corresponding to the dimming lower limit value of the lamp to the intensity of external light (illuminance). It is varied according to. And since the dimming lower limit value is set for the illuminating device, the illuminance of the illuminated surface obtained by the illuminating device does not fall below the illuminance Ln. However, when the intensity of the external light becomes higher than the point P in the drawing, the control device 44 turns off the lamp of the lighting device after a predetermined time (for example, 20 seconds) after the timer circuit 49 starts counting time.

[0003]

The illuminating device of the prior art illuminates at a constant illuminance at a target illuminance when external light is relatively weak, and lowers the lower limit for a certain period of time when the external light becomes strong. By keeping the light and then turning off the light, a lighting device with low power consumption can be realized.

Here, in such a device, generally, an illuminating device is arranged for each predetermined area, the actual illuminance is detected for each predetermined area, and the illuminance of the illuminated surface in each area is made constant. Control. However, when the amount of external light incident on each area is different, the amount of light radiated from each lighting device is different, and the brightness of the ceiling surface of each area and the surroundings of the lighting fixtures are different, which causes discomfort and discomfort. Has disadvantages.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to provide a lighting control device and a lighting device capable of reducing a difference in brightness around a ceiling surface to which a lighting device is attached and eliminating a sense of discomfort and discomfort. The purpose is to provide.

[0006]

According to a first aspect of the present invention, there is provided an illumination control device which outputs a dimming signal for controlling an output of a high-frequency lighting device for energizing a discharge lamp in accordance with brightness of a predetermined area. A dimming signal calculation unit to be generated; and a dimming lower limit setting unit configured to arbitrarily set a lower limit value of the dimming signal generated by the dimming signal calculation unit.

In the present invention and each of the following inventions, definitions and technical meanings of terms are as follows unless otherwise specified.

The high-frequency lighting device whose output is controlled by the illumination control device is, for example, an existing inverter-type lighting device, and energizes at least one discharge lamp.

The predetermined area is an illumination area illuminated by a discharge lamp connected to the illumination control device via a high-frequency lighting device.

The brightness of a predetermined area mainly means the total brightness of external light, such as sunlight, and illumination by a discharge lamp, and other discharges disposed around the sled area. Illumination light from a lamp is also included.

The dimming signal calculation section inputs the brightness of a predetermined area, generates a dimming signal such that the brightness of the predetermined area becomes a desired (target) brightness, and converts the dimming signal to a high frequency. Send to lighting device. The dimming signal is, for example, a signal of PWM control, and varies the on-duty of the switch element of the high-frequency lighting device to dimming the discharge lamp.

The lower limit value of the dimming signal set in the dimming lower limit setting section can be arbitrarily set, and is configured to be able to cope with a case where a plurality of lighting control devices are provided.

The dimming signal calculation section of the lighting control device inputs, for example, the brightness of a predetermined area detected by an optical sensor or the like, and performs dimming so that the brightness of the predetermined area becomes a desired brightness. A signal is generated, and the dimming signal is sent to the high frequency lighting device. The high-frequency lighting device dims the discharge lamp in accordance with the dimming signal to make a predetermined area have a desired brightness. When the external light increases and the brightness of the predetermined area increases, the dimming signal changes, and the high-frequency lighting device dims the discharge lamp. When the dimming signal reaches the lower limit, the dimming signal calculation unit sends the lower limit dimming signal to the high-frequency lighting device even if the external light further increases.

In the dimming lower limit setting section of the illumination control device,
Since the lower limit of the dimming signal can be set arbitrarily,
Provided is a lighting control device capable of setting the brightness of a predetermined area to a desired brightness up to a lower limit value of a dimming signal and performing lighting control for each predetermined area corresponding to each dimming control device. it can.

A lighting apparatus according to a second aspect of the present invention illuminates a predetermined area, and includes a discharge lamp and a high-frequency lighting device for energizing the discharge lamp in a dimmable manner;
An optical sensor for detecting the brightness of a predetermined area; an illumination control device for controlling the high-frequency lighting device based on a detection output of the optical sensor to dimming the discharge lamp; and illuminating an area adjacent to the predetermined area. A lighting fixture including a discharge lamp and a high-frequency lighting device for dimmably energizing the discharge lamp; an optical sensor for detecting the brightness of the area; and controlling the high-frequency lighting device by a detection output of the optical sensor. ,
A lighting control device for dimming the discharge lamp; wherein each of the lighting control devices has a lower limit value of dimming such that the brightness around the lighting fixture corresponding to each lighting control device is approximately similar. .

The lower limit of the dimming is set for each lighting control device so that the brightness around the lighting equipment corresponding to each lighting control device is approximately similar.

The discharge lamp included in the luminaire illuminating the predetermined area and the discharge lamp included in the luminaire illuminating the area adjacent to the predetermined area are the same even if the type, electric power, etc. are different. You may.

A plurality of optical sensors are provided, and any detected output value, such as a maximum value, a minimum value, or an average value, of the detected outputs of the optical sensors in the illumination control device may be used. If the light sensor can detect the brightness of the predetermined area,
The mounting position, mounting direction, etc. do not matter.

When the intensity of the external light changes and the brightness of a predetermined area or an area adjacent to the predetermined area changes, the optical sensor detects the brightness and sends a detection output to each lighting control device. Each lighting control device controls the high-frequency lighting device based on the detection output of the optical sensor to control the intensity of the discharge lamp so that the brightness of each area becomes constant. However, each lighting control device does not control the high-frequency lighting device beyond the dimming lower limit value set in each lighting control device. That is, the discharge lamp is not dimmed deeper than the lower limit of dimming.

[0020] Even if the degree of dimming of each lighting control device is different, the brightness around the lighting fixture corresponding to each lighting control device is approximately similar, so that the feeling of discomfort and discomfort around the lighting fixture can be eliminated.

According to a third aspect of the present invention, in the lighting control device according to the second aspect, one light sensor is provided in an area corresponding to each lighting control device.

The brightness of each of the predetermined area and the area adjacent to the predetermined area is detected by one optical sensor.

Since the number of optical sensors is minimized, the lighting device can be made inexpensive.

According to a fourth aspect of the present invention, in the illumination control device according to the second or third aspect, the optical sensor is provided integrally with the lighting fixture.

The optical sensor receives reflected light from a floor, a wall, or the like, and detects the brightness of a predetermined area and an area adjacent to the predetermined area.

Since the optical sensor is integrally mounted on the lighting equipment, the labor for disposing the optical sensor in a predetermined area and an area adjacent to the predetermined area can be saved.

[0027]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of a lighting device showing an embodiment of the present invention. In the figure, an illumination device 1 includes an illumination control device 2, high-frequency lighting devices 3, 3, a discharge lamp 4,
4. Lighting fixtures 5 and 5 and optical sensor 6 are provided. The lighting control device 2 includes a control unit 7 including a microcomputer,
It comprises a storage section 8 and a dimming signal generation section 9 and is connected to a commercial power supply (not shown). The optical sensor 6 is connected to the control unit 7. The optical sensor 6 detects the brightness of a predetermined area illuminated by the lighting devices 5 and 5 and inputs a detection output corresponding to the brightness to the control unit 7. Storage unit 8
Can be stored without power supply, for example, EEPRO
M (electrically erasable and erasable memory), and stores a reference set value of the optical sensor 6 and a lower limit value of a dimming signal for setting the brightness of a predetermined area to a target brightness. Control unit 7
Includes a CPU and a ROM in which a program is written, compares a detection output of the optical sensor 6 with a reference set value of the optical sensor 6 read from the storage unit 8, and sends a deviation thereof to the dimming signal generation unit 9. . Further, the control unit 7 includes a storage unit 8
And reads out the lower limit value of the dimming signal from the controller and sends it to the dimming signal generator 9. The dimming signal generation unit 9 includes a plurality of high frequency lighting devices 3,
3 and sends out a PWM control dimming signal to the high frequency lighting devices 3 and 3. That is, the dimming signal generation unit 9 controls the output by changing the on-duty of the switch elements of the high frequency lighting devices 3 and 3 so that the deviation between the detection output of the optical sensor 6 and the reference set value is zero. The control unit 7 and the dimming signal generation unit 9 are dimming signal calculation units 10 that generate dimming signals for controlling the outputs of the high frequency lighting devices 3 and 3 according to the brightness of a predetermined area. The storage unit 8 can store the lower limit value of the dimming signal at an arbitrary value, and can set the lower limit value of the dimming signal arbitrarily.
Plays a role.

The discharge lamps 4, 4 are connected to the high-frequency lighting devices 3, 3, respectively. Here, the discharge lamps 4, 4
Are energized to have the same dimming lower limit. Then, the high-frequency lighting devices 3, 3 energize the discharge lamps 4, 4 so as to be dimmable by varying the on-duty of the switch element and controlling the output. The high-frequency lighting devices 3, 3 and the discharge lamps 4, 4
It is housed in lighting fixtures 5,5. Lighting fixtures 5 and 5
Illuminate a given area. Then, an optical sensor 6 for detecting the brightness of a predetermined area is installed in one of the plurality of lighting devices 5. FIG. 2 shows a lighting fixture 12 provided with the optical sensor 6. In the figure, lamp sockets 13, 13
A fluorescent lamp 4 as a discharge lamp is connected between them, and a high-frequency lighting device 3 for energizing the fluorescent lamp 4 is accommodated therein, and the fluorescent lamp 4 and the high-frequency lighting device 3 are connected by an electric wire (not shown). Further, an optical sensor 6 is mounted on an end portion of the lighting fixture 12. The optical sensor 6 is provided integrally with the lighting fixture 12. The high-frequency lighting device 3 and the optical sensor 6 are connected to the illumination control device 2 shown in FIG. 1 by lead wires (not shown). Lighting equipment 1
2 and 5 are installed on the ceiling 14 and the like, and the illumination light 15 is
A predetermined area 17 is illuminated. The optical sensor 6 receives the reflected light from the predetermined area 17 and
Is detected. The predetermined area 17 is irradiated with external light 18 in addition to the illumination light 15 from the lighting fixtures 12 and 5, and the brightness of the predetermined area 17 is formed by the illumination light 15 and the external light 18. In addition, the light sensor 6 is a lighting device
It is not necessary to provide the area 17 and it is sufficient to attach it to a place where the brightness of the predetermined area 17 can be detected. Also,
A plurality of optical sensors 6 may be provided.

Thus, the illumination device 1 for illuminating the predetermined area 17 is formed. And the predetermined area 17
FIG. 1 (b) shows an illumination device for illuminating an area adjacent to. The illumination device 21 shown in FIG.
2, high frequency lighting devices 23, 23, discharge lamps 24, 2
4. It is configured similarly to the lighting device 1 including the lighting fixtures 25, 25 and the optical sensor 26. Here, when the discharge lamps 24, 24 are different from the discharge lamps 4, 4 of the lighting device 1, the high-frequency lighting devices 23, 23 are also different. Further, the lighting fixtures 25, 25 need not be the same as the lighting fixtures 5, 5 of the lighting device 1. Furthermore, the numbers of the lighting fixtures 25, 25, the high-frequency lighting devices 23, 23, and the discharge lamps 24, 24 do not need to be the same as those of the lighting device 1. And the optical sensor 26 is installed in one of the plurality of lighting fixtures 25, 25. FIG. 3 shows a lighting fixture 32 provided with the optical sensor 26. The lighting fixture 32 is the lighting fixture 12 shown in FIG.
The optical sensor 26 is provided integrally with the lighting fixture 32. Illumination light 35 of lighting fixtures 32 and 25
Illuminates a predetermined area 37 such as a floor surface 36,
6 detects the brightness of the predetermined area 37 by receiving the reflected light from the predetermined area 37. In the predetermined area 37,
An external light 38 is irradiated in addition to the illumination light 35 from the illumination devices 32 and 25, and the illumination light 35 and the external light 38 cause a predetermined area 3.
A brightness of 7 is formed. Thus, areas adjacent to the predetermined area are sequentially formed, and a lighting device for illuminating each area is provided.

Next, the operation of the embodiment of the present invention will be described.

FIG. 4 is a flowchart of the illumination devices 1 and 21 showing the embodiment of the present invention, and FIG. 5 is a continuation of FIG.
When the commercial power is turned on, the microcomputer in the lighting control device 2 is initialized in steps S1 to S6 in FIG. Initializing the RAM area in step S2, step S3
To initialize the ports and registers.
Stores the reference set value (target brightness) of the optical sensor 6 in the storage unit 8
The control unit 7 reads the lower limit value of the dimming signal from the storage unit 8 in step S5. In step S6, the initialization of the microcomputer ends. Then, the illumination control device 2 turns on the discharge lamps 4 and 4 via the high-frequency lighting devices 3 and 3. When the discharge lamps 4 and 4 are turned on, the lighting fixtures 5 and 5 and the lighting fixture 12 illuminate a predetermined area 17. The predetermined area 17 has brightness formed by the illumination light 15 and the external light 18 of the lighting fixtures 5 and 5 and the lighting fixture 12.

When the initialization of the microcomputer of the illumination control device 2 is completed and the discharge lamps 4 and 4 are turned on, the illumination control device 2 starts the main processing from step S7. Step S8
Then, the control unit 7 of the illumination control device 2 inputs the detection output (detection value) of the optical sensor 6 and proceeds to step S9. Step S
In 9, the control unit 7 compares the reference set value of the optical sensor 6 with the detected value. That is, the control unit 7 reads the target brightness from the storage unit 8 and controls the brightness of the predetermined area 17 to be the target brightness. If the reference set value is larger than the detection value, the process proceeds to step S10. In step S10, since the brightness of the predetermined area 17 is lower than the target brightness, the dimming signal generation unit 9 narrows the ON width of the dimming signal and sends the dimming signal to the high frequency lighting devices 3, 3. Then, the lamp power (lamp output) of the discharge lamps 4 and 4 is increased, and the process proceeds to step S14. When the reference set value of the optical sensor 6 is equal to the detected value, the process proceeds to step S11. In step S11, since the brightness of the predetermined area 17 is the target brightness, the dimming signal generation unit 9 does not change the dimming signal, and proceeds to step S14. If the reference set value is smaller than the detected value, the brightness of the predetermined area 17 is brighter than the target brightness, and therefore, the process proceeds to step S12 to darken the brightness of the predetermined area 17. In step S12, it is determined whether or not the high frequency lighting devices 3 and 3 are controlled by the control unit 7 and the dimming signal generation unit 9 to the lower limit of the dimming signal (the lower limit of dimming). When the high frequency lighting devices 3 and 3 are controlled to the lower limit of the dimming signal, the dimming signal generator 9 holds the lower limit dimming signal and proceeds to step S14. That is, the high-frequency lighting devices 3 and 3 energize the discharge lamps 4 and 4 with the dimming signal of the lower limit, and the lighting fixtures 5 and 5 emit light 15 of the dimming lower limit of the discharge lamps 4 and 4 to a predetermined area 17. To illuminate. The brightness of the predetermined area 17 becomes brighter than the target brightness. This is because the outside light 18 is strongly applied to the inside of the predetermined area 17. If the high-frequency lighting devices 3 and 3 are not controlled to the lower limit value of the dimming signal, the process proceeds to step S13. Step S
In 13, since the brightness of the predetermined area 17 is brighter than the target brightness, the dimming signal generator 9 widens the ON width of the dimming signal and sends the dimming signal to the high frequency lighting devices 3. The lamp power (lamp output) of the discharge lamps 4 and 4 is reduced, and the process proceeds to step S14.

In step S14, it is determined whether the dimming lower limit selection mode has been selected. That is, the lower limit for dimming the discharge lamps 4 and 4 is set. The selection of the selection mode is performed by, for example, pressing a selection button of a remote controller and transmitting a selection signal to the illumination control device 2. If the lower limit value of the light control signal is not selected, for example, when the lower limit value of the light control signal is already set, the process proceeds to step S21, and the main process ends. When the dimming lower limit selection mode is selected, the lower limit for dimming the discharge lamps 4 and 4 is set in step S
Proceed to 15. Steps S15 to S18 are performed, for example, at night so that the external light 18 does not enter. In step S15, the discharge lamps 4 and 4 are all lighted (100% lighted), and the process proceeds to step S16. In step S16, the control unit 7 inputs the detection value of the optical sensor 6 when the all light is turned on, and proceeds to step S17. Step S1
At 7, the lighting control device 2 turns on the discharge lamps 4, 4 at the dimming lower limit value of the high frequency lighting devices 3, 3, and at step S18.
Proceed to. In step S18, the control unit 7 inputs the detection value of the optical sensor 6 when the lower limit value is lit, and proceeds to step S19. In step S19, the values detected by the optical sensor 6 when the all-lights are lit and when the lower limit is lit are compared, and the type of the high-frequency lighting devices 3 and 3 is selected. The storage unit 8 in the illumination control device 2 stores in advance the types of the high-frequency lighting devices 3 and 3 and the lower limit value of the dimming (minimum dimming rate). Dividing the detection value of the light sensor 6 at the time of lighting the lower limit value by the detection value at the time of lighting of all lights gives the dimming rate of the lighting of the lower limit value. be able to. In the figure,
The types of the high-frequency lighting devices 3 and 3 are assigned to a lower limit value 1, a lower limit value 2,... Current high frequency lighting device 3,
After specifying the three types, the process proceeds to step S20. In step S20, the dimming lower limit value (minimum dimming rate) of the current high-frequency lighting devices 3, 3 is stored in the storage unit 8, and step S20 is performed.
Proceed to 21. In step S21, the main processing ends, and the flow advances to step S7, and thereafter, the main processing is repeated.

The illumination device 21 for illuminating the area 37 adjacent to the predetermined area 17 operates as described above. Lighting equipment 2 that illuminates the lighting area 37
The illumination lights 35 and 25 are controlled by the illumination control device 22. In addition, the lower limit of the dimming signal is set in the illumination controller 22 to control the high frequency lighting devices 23, 23 so that the discharge lamps 24, 24 are dimmed to the lower limit.

Since the intensity of external light 18 incident on the predetermined area 17 and the intensity of external light 38 incident on the area 37 adjacent to the predetermined area 17 are usually different, the intensity of the discharge lamps 4 Dimming ratio and discharge lamp 2 of lighting device 21
4, 24 have different dimming rates. When the dimming difference between the two is large, the lighting fixtures 5, 5, 25, 2 including the ceilings 14, 34 are provided.
5 The brightness around the eyes is visually different, which causes discomfort and discomfort to the person. In the lighting devices 1 and 21 of the present embodiment, the lighting control devices 2 and 22 each have a lower limit of dimming so that the brightness around the lighting devices 5, 5, 25 and 25 is approximately similar. It is set in advance. For example, when the external light 18 incident on the predetermined area 17 is strong, the illumination device 1 turns on the discharge lamps 4 and 4 with the lower limit of dimming, and the illumination device 21 emits all light in the area 37 adjacent to the predetermined area 17. Even when the discharge lamps 24, 24 are turned on by lighting, the brightness around the lighting fixtures 5, 5, 25, 25 is approximately similar.

Since the brightness around the lighting fixtures 5, 5, 25, 25 corresponding to the respective lighting control devices 2, 22 is substantially similar, the difference in brightness around the lighting fixtures 5, 5, 25, 25 is different. It is possible to reduce the discomfort and discomfort.

[0038]

According to the first aspect of the present invention, the lower limit of the dimming signal can be arbitrarily set in the dimming lower limit setting section of the illumination control device. It is possible to provide a lighting control device capable of setting the brightness of an area to a desired brightness and performing lighting control for each predetermined area corresponding to each dimming control device.

According to the second aspect of the present invention, since the lower limit value of dimming of each lighting control device is set such that the brightness around the lighting device corresponding to each lighting control device is approximately approximated, the lighting device is set. Discomfort and discomfort due to uneven brightness of the surroundings can be eliminated.

According to the third aspect of the present invention, since the number of optical sensors provided in each lighting device is minimized, the cost of the lighting device can be reduced.

According to the fourth aspect of the present invention, since the optical sensor is integrally attached to the lighting fixture, it is not necessary to arrange the optical sensor in a predetermined area and an area adjacent to the predetermined area.

[Brief description of the drawings]

FIG. 1 is a block diagram of a lighting device according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a lighting device that illuminates a predetermined area.

FIG. 3 is a cross-sectional view of a lighting device that illuminates an area adjacent to a predetermined area.

FIG. 4 is a flowchart of a lighting device according to the embodiment of the present invention.

FIG. 5 is a flowchart continued from FIG. 4;

FIG. 6 is a block diagram of a conventional lighting device.

FIG. 7 is a view showing a change in illuminance with respect to external light of a conventional illumination device.

[Explanation of symbols]

 1, 21 lighting device 2, 22 lighting control device 3, 23 high-frequency lighting device 4, 24 discharge lamp 5, 25 lighting fixture 6, 26 optical sensor 10 dimming signal calculation unit 11 dimming lower limit setting unit

Claims (4)

[Claims] 1. A dimming signal calculating section for generating a dimming signal for controlling an output of a high-frequency lighting device for energizing a discharge lamp in accordance with the brightness of a predetermined area; A light control lower limit setting unit configured to arbitrarily set a lower limit value of the light control signal. 2. An illuminating device including a discharge lamp and a high-frequency lighting device for illuminating the discharge lamp and dimming the discharge lamp, an optical sensor for detecting brightness of the predetermined area, and an optical sensor. An illumination control device for controlling the high-frequency lighting device according to the detection output to dimming the discharge lamp; illuminating an area adjacent to the predetermined area, and energizing the discharge lamp and the dimmable discharge lamp A lighting fixture including a high-frequency lighting device; an optical sensor for detecting the brightness of the area; and a lighting control device for controlling the high-frequency lighting device based on a detection output of the optical sensor to dim the discharge lamp; In each of the above lighting control devices, a lower limit value of dimming is set such that brightness around a lighting fixture corresponding to each lighting control device is approximately similar. 3. The lighting device according to claim 2, wherein one light sensor is provided in an area corresponding to each lighting control device. 4. The lighting device according to claim 2, wherein the light sensor is provided integrally with the lighting fixture.