KR101359791B1 - LED luminaire capable of automatically controlling illuminance - Google Patents

Abstract

The present invention relates to an LED luminaire capable of automatically adjusting the illuminance using an illuminance sensor, the LED illuminating device capable of automatically adjusting the illuminance according to the preferred embodiment of the present invention includes: at least one LED and is a standard for illuminance measurement. A light emitting module emitting light toward a working surface; A sensing module mounted on the light emitting module and having an illuminance sensor measuring the illuminance of the working surface; And a controller configured to gradually increase or decrease the luminance of the LED such that the measured illuminance value is closer to the reference illuminance value by comparing the measured illuminance value, which is the illuminance of the working surface measured by the illuminance sensor, with a preset reference illuminance value. It is provided.

Description

LED luminaire capable of automatically adjusting illuminance {LED luminaire capable of automatically controlling illuminance}

The present invention relates to an LED luminaire capable of automatically adjusting the illuminance, and more particularly to an LED luminaire capable of automatically adjusting the illuminance using an illuminance sensor.

Generally, a lighting device installed in a room is connected to an on / off switch, so that the lighting device can be turned on or off by manually operating the on / off switch.

On the other hand, the luminaire is very inconvenient because the on-off switch must be manually operated in accordance with the brightness of the room, and to keep the brightness of the room continuously above the desired brightness, the luminaire should always be turned on. As a result, power consumption is extremely problematic.

In order to alleviate this inconvenience, lighting fixtures are automatically developed on and off according to the brightness of the room. The luminaire is equipped with a light sensor, which measures the brightness of the entire light by the light emitted from the luminaire and the light introduced from the outdoors into the room. Here, when the brightness of the measured light is higher than the predetermined reference brightness, the power supply to the luminaire is cut off, on the contrary, if the brightness of the measured light is lower than the predetermined reference brightness, it operates by applying power to the luminaire do.

Of course, the luminaires are automatically turned on and off according to the brightness of the room, so there is an advantage that manual operation is unnecessary. However, since the lighting may be repeatedly turned on and off continuously, the eyes become very tired, There is a problem that reduces a person's concentration.

In particular, in the luminaire, if the brightness of the light detected by the light sensor is similar to a predetermined reference brightness, the light is turned off by a slight increase in brightness, and conversely, the light is turned on by a slight drop in brightness. It is inconvenient that the light fixture blinks quickly.

Therefore, this luminaire has a limitation in that it is not possible to continuously maintain the brightness above the brightness desired by the occupant in the room.

In addition, there is a problem in that light is irradiated more than necessary because the lighting fixture is operated only on and off, and power is wasted.

The present invention has been conceived to solve the above-mentioned problems, and an object of the present invention is to provide an LED lighting device that is continuously controlled so that illuminance in a specific space of a room is higher than illuminance desired by a visitor.

Another object of the present invention is to provide an LED lighting device that can adjust the illuminance so that eyes are not tired in a specific space of the room, and the concentration of indoor occupants is not reduced.

According to a preferred embodiment of the present invention to achieve the above object, the LED illumination device capable of automatically adjusting the illumination comprises: a light emitting module having at least one LED and emitting light toward a working surface which is a standard of illuminance measurement; A sensing module mounted on the light emitting module and having an illuminance sensor measuring the illuminance of the working surface; And a controller configured to gradually increase or decrease the luminance of the LED such that the measured illuminance value is closer to the reference illuminance value by comparing the measured illuminance value, which is the illuminance of the working surface measured by the illuminance sensor, with a preset reference illuminance value. It is provided.

Preferably, the sensing module is installed on the surface on which the LED is installed.

The light emitting module may further include a diffusion plate spaced apart from the LED in a direction in which light is emitted, and the sensing module may be installed on the diffusion plate.

More preferably, in order to accurately measure the illuminance of the working surface, the sensing module has a blocking structure for shielding the illuminance sensor from the light emitted from the light emitting module.

Here, the blocking structure is formed to extend toward the working surface surrounding the surrounding of the illuminance sensor so as not to cover the space between the illuminance sensor and the working surface.

Preferably, the illuminance sensing width 2θ of the working surface of the illuminance sensor corresponds to a lighting area that can be in charge of a luminaire.

The blocking structure extends toward the working surface such that the illuminance detection width 2θ is 50 ° to 80 °.

On the other hand, the blocking structure is a horizontal cross-section is a circular or polygonal, the width of the horizontal cross-section is kept constant or large along the direction extending toward the working surface.

Preferably, the controller increases or decreases the brightness of the LED by 1.2 to 1.3 times every 20 seconds so that the measured illuminance value approaches the reference illuminance value.

In the LED luminaire capable of automatically adjusting the illumination according to another embodiment of the present invention, the light emitting module is made of a plurality of sensing modules are mounted for each light emitting module, the control unit is an illumination sensor mounted among the plurality of light emitting modules The light emitting module in which the measured illuminance value lower than the reference illuminance value is sensed is controlled to increase the brightness, and the light emitting module in which the measured illuminance value higher than the reference illuminance value is detected is controlled to lower the light intensity.

The present invention has the following effects.

First, it is possible to provide an LED lighting fixture that is continuously automatically controlled so that the illuminance in a specific space of the room is more than the illuminant desired by the visitor.

Secondly, while continuously controlling the illuminance in the specific space of the room to the illuminance more than the desired illuminator, it is possible to provide an LED lighting device that does not fatigue the occupant's eyes, and does not reduce the concentration of the occupant.

Third, it is possible to provide an LED lighting device that can reduce the power consumption while continuously controlling the illuminance in a specific space of the room to the illuminance more than the illuminator desired.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate preferred embodiments of the invention and, together with the description of the invention given above, serve to further the understanding of the technical idea of the invention, And should not be construed as interpretation.
1 is a bottom view of an LED luminaire capable of automatic dimming according to an exemplary embodiment of the present invention.
FIG. 2 is a cross-sectional view taken along line II-II 'of the LED luminaire shown in FIG. 1 and shows a state where the LED luminaire is installed in an indoor space.
3 (a), 3 (b) and 3 (c) are perspective views of a modification of the blocking structure provided in the sensing module.
Figure 4 is a light distribution curve showing the luminous intensity emitted from the LED luminaire capable of automatic dimming according to an exemplary embodiment of the present invention.
FIG. 5 is a graph illustrating time-series changes in measured illuminance values measured by installing an illuminance sensor in an indoor lighting device installed near a window in a specific indoor space.
FIG. 6 is a graph illustrating a time-series change in measured illuminance values measured by installing an illuminance sensor in an indoor luminaire installed away from a window in the same room as the specific indoor space of FIG. 5.
Figure 7 is a simplified configuration of the LED lighting fixture capable of automatically adjusting the illumination according to another embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings will be described in detail with respect to the LED lighting fixture capable of automatically adjusting the illumination according to a preferred embodiment of the present invention.

The terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms and the inventor may appropriately define the concept of the term in order to best describe its invention It should be construed as meaning and concept consistent with the technical idea of the present invention. Therefore, the embodiments described in the specification and the drawings shown in the drawings are only the most preferred embodiment of the present invention and do not represent all of the technical idea of the present invention, various modifications that can be replaced at the time of the present application It should be understood that there may be equivalents and variations.

In the drawings, the size of each element or a specific part constituting the element is exaggerated, omitted or schematically shown for convenience and clarity of description. Therefore, the size of each component does not entirely reflect the actual size. In the following description, it is to be understood that the detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

FIG. 1 is a bottom view of an LED luminaire capable of automatically adjusting illuminance according to an exemplary embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along line II-II 'of the LED luminaire shown in FIG. The state of the instrument is installed in the indoor space.

With reference to Figures 1 and 2 will be described with respect to the LED luminaire which can automatically adjust the illumination according to a preferred embodiment of the present invention.

The lighting device of the present invention includes a light emitting module 10 having a frame 2, at least one LED 12 and emitting light, and a sensing module mounted on the light emitting module 10 to measure illuminance ( 20) and a controller 30 for adjusting the luminous intensity of the LED 12 by comparing the illuminance value measured by the sensing module 20 with the reference illuminance value.

The light emitting module 10, the sensing module 20, and the controller 30 may be installed in the frame 2. The frame 2 may be made of metal so that heat generated from the LED 12 of the light emitting module 10 may be easily released to the outside, and a heat radiation slit or a heat radiation hole for heat radiation may be formed. On the other hand, the control unit 30 may be installed inside the frame 2 so as not to be exposed to the outside of the luminaire to improve the appearance of the luminaire.

Depending on the purpose of the installation of the luminaire, the luminaire may be installed at various positions such as the ceiling surface 42, the bottom surface 44, the wall surface of the room, but it is generally installed on the ceiling surface 42. Will be described by taking an example where it is installed on the ceiling surface (42).

The light emitting module 10 is most commonly installed on the lower surface of the frame 2 and includes a substrate 14 and an LED 12 arranged on the substrate 14. In addition, in order to reduce the loss of light emitted from the LED 12, it is preferable that a reflecting plate 16 is formed at a portion of the surface of the substrate 14 where the LEDs 12 are not arranged. It may be formed of a plate-shaped member having an opening corresponding to the shape of 12).

On the other hand, when the lighting fixture is installed on the ceiling surface 42, the light emitting module 10 is basically emitted light downward toward the bottom surface 44, so the illuminance of the bottom surface 44 is important. However, from the perspective of those who live indoors or perform office work in the office, the illuminance of the point where the gaze stays is more important than the illuminance of the floor surface 44 when actually living in the room or performing a specific task. For example, when working on a document or using a computer in an office or the like, the roughness of the upper surface of the desk rather than the roughness of the bottom surface 44 has a greater influence on work efficiency, eye fatigue, and concentration. Therefore, hereinafter, the work or the work is mainly performed in a space such as an office, and the description will be made regarding the adjustment of the illuminance based on the illuminance of the upper surface of the desk where the operator's gaze mainly stays. Collectively referred to as the working surface 46 '.

That is, the light emitting module 10 emits light toward the work surface 46, and the work surface 46 serves as a reference for illuminance measurement.

The sensing module 20 has an illuminance sensor 22 for measuring illuminance of the working surface 46 and a blocking structure 24 for shielding the illuminance sensor 22 from light emitted from the light emitting module 10.

The illuminance sensor 22 is not merely a sensor for extensively measuring the brightness of the entire room, but a sensor for intensively measuring the illuminance of the work surface 46 among the brightness of the whole room. Therefore, it is necessary to remove the factors that adversely affect the accurate measurement of the roughness of the working surface 46. To this end, the light component that affects the illuminance of the working surface 46 among the light flowing into the room from the outside through the window is measured by the illuminance sensor 22, but the light flowing into the room from the outside is directly measured by the illuminance sensor ( The blocking structure 24 surrounds the illuminance sensor 22 to prevent it from entering the 22.

By this blocking structure 24, the roughness of the working surface 46 can be measured accurately.

On the other hand, in order to equalize the distance h between the work surface 46 from the LED 12 and the work surface 46 from the illuminance sensor 22, the sensing module 20 is connected to the LED ( 12) can be installed on the side where it is installed. Since the illuminance sensor 22 measures illuminance directly under the illuminance sensor 22, the blocking structure 24 may be configured to cover the space between the illuminance sensor 22 and the working surface 46. It is preferably formed to surround the periphery and extend toward the working surface 46. 1 and 2, the illuminance sensor 22 is preferably positioned at the center of the light emitting surface of the light emitting module 10. However, the illuminance sensor 22 is used to measure the illuminance of the working surface 46. If the position does not have a large error can be installed anywhere, for example, it can be formed on the outer portion of the light emitting surface.

The light emitted from each LED 12 shown in FIG. 2 will emit light as point lighting. Therefore, the sensing module 20 is preferably installed on the surface on which the LED 12 is installed. However, the light emitting module 10 may further include a diffusion plate (not shown) spaced apart from the LED 12 in a direction in which light is emitted. In general, a diffuser plate in a luminaire is employed to make a light source, which is a point light, as a surface light, and may be formed of glass or translucent acrylic plates. As described above, when the light emitting module 10 includes the diffusion plate, the sensing module 20 is preferably installed on the diffusion plate.

3 (a), 3 (b) and 3 (c) are perspective views of a modification of the blocking structure 24 provided in the sensing module 20, and the cylindrical blocking structure 24 shown in FIGS. 1 and 2. In addition, a rectangular parallelepiped, a wide bottom cylinder, and a wide bottom cube structure 24 may be used in this way. The shape of the blocking structure 24 as described above is exemplary, the blocking structure 24 is a circular or polygonal shape of the horizontal cross-section parallel to the working surface 46, the width of the horizontal cross-section is the working surface 46 1, 2, and 3 may be kept constant as shown in FIG. As such, the blocking structure 24 may be formed in various shapes, but they are all common in that they do not obstruct the space between the illuminance sensor 22 and the working surface 46.

Since the blocking structure 24 prevents light emitted from the light emitting module 10 from directly entering the illuminance sensor 22, the illuminance sensor 22 measures the illuminance of the working surface 46. It is possible to minimize the error that can be generated by (10). However, in order for the illuminance sensor 22 to measure the illuminance of the working surface 46 as accurately as possible, it is necessary to determine how much the blocking structure 24 limits the illuminance measuring range of the illuminance sensor 22. Referring to Fig. 4, the determination of the illuminance measurement range will be discussed.

Figure 4 is a light distribution curve showing the light intensity emitted from the LED luminaire capable of automatic adjustment of illuminance according to an exemplary embodiment of the present invention, the X-axis and Y-axis shows a plane in which the working surface 46 is located. As shown in FIG. 1, since the lighting device is generally rectangular in shape, the light distribution curve based on the X-axis and the light distribution curve based on the Y-axis may not coincide, and FIG. 4 illustrates the X-axis and the Y-axis. The light distribution curves do not coincide.

Referring to FIG. 4, the luminance is about 500 cd directly below (θ = 0 °) of the luminaire, and the vertical component of the luminosity directly under the luminaire is the vertical component of the luminosity that affects the illuminance of the working surface 46. Is about 500 cd, which is 500 cos0 °. Of course, the illuminance of the work surface 46 decreases as it deviates from directly below the luminaire, and in the design of a luminaire such as an office, the vertical component of the brightness reflected on the work surface 46 is directly below the luminaire. The area up to half of the luminosity will be set as the lighting area, the area where the luminaire is responsible for lighting.

From this point of view, based on a case where the direct brightness of the luminaire is about 500 cd, the luminaire may be responsible for an area in which the vertical component of the luminance projected on the work surface 46 is about 250 cd. It becomes the lighting area that there is.

In Fig. 4, when θ = 30 °, the x-axis reference brightness x ₁ is 300cd and its vertical component is 259.8cd, which is 300cos30 °. The y-axis reference brightness y ₁ is 360 cd and its vertical component is 311.8 cd with 360 cos30 °.

In addition, when θ = 32.5 ° in FIG. 4, x ₂ reference light intensity x ₂ is 250 cd and its vertical component is 210.8 cd at 250 cos 32.5 °. The y-axis reference brightness y ₂ is 300 cd and its vertical component is 253.0 cd with 300 cos 32.5 °.

That is, X-axis reference intensity of x _1, select the closer x ₁ on a vertical component 250cd from x ₂ and, Y axis based on brightness of y _1, y ₂ from the vertical component When selecting the closer y ₂ to 250cd A lighting area that can be handled by the light fixture having the light distribution curve of FIG. 4 is set, that is, 30 ° in the + X and -X directions, and 32.5 ° in the + Y and -Y directions. It is a lighting area to be in charge of.

And, in order for the illuminance sensor 22 to best follow the illuminance of the working surface 46 generated by the light emitted from the luminaire, the illuminance of the illuminance sensor 22 to the above-described illuminating area of the luminaire. It is necessary to correspond the detection width 2θ. Here, illuminance detection width 2θ is defined as indicating an angular range in which the illuminance sensor 22 measures illuminance of the working surface 46.

Specifically, in order to determine the illuminance detection width 2θ, the blocking structure 24 is formed so as to extend toward the working surface 46 while surrounding the periphery of the illuminance sensor 22, but from the center of the illuminance sensor 22. The angle θ formed between the line L2 connecting the lower end of the blocking structure 24 and the line L1 connecting the work surface 46 directly below from the center of the illuminance sensor 22 is in the + X and -X directions. Is 30 °, and 32.5 ° in the + Y and -Y directions.

In other words, the illuminance detection width 2θ is 60 ° in the X-axis direction and 65 ° in the Y-axis direction. However, in some cases, the lighting area may be set to more than half of the direct brightness of the luminaire or less than half, so the illuminance detection width (2θ) is 50 ° which is wider than 60 ° to 65 °. Can be set to ~ 80 °.

FIG. 5 is a graph illustrating a time series change of measured illuminance values measured by installing an illuminance sensor 22 in an indoor luminaire installed near a window in a specific indoor space, and FIG. 6 is the same space as the specific indoor space of FIG. 5. Is a graph showing time-series changes in measured illuminance values measured by installing an illuminance sensor 22 in an indoor luminaire installed away from a window, where 'measured illuminance value' is a task measured by the illuminance sensor 22. It means the roughness of the surface 46.

5 and 6, it can be seen that the measured illuminance value measured by the illuminance sensor 22 is significantly different from the illuminance value of the actual working surface 46. Since the illuminance sensor 22 is provided in the LED luminaire, there is a physical distance difference from the working surface 46. Therefore, the measured illuminance value measured by the illuminance sensor 22 is multiplied by the conversion constant k. Only the roughness value of the actual working surface 46 can be known. For example, if the illuminance value of the actual working surface 46 is 420 lux, and the measured illuminance value of the illuminance sensor 22 is 30 lux, then the value of the conversion constant k becomes 14. In addition, the value of the conversion constant k may vary depending on the distance between the illuminance sensor 22 and the working surface 46. If the distance between the illuminance sensor 22 and the working surface 46 is far, The value of the conversion constant k becomes large, and when the distance between the illuminance sensor 22 and the working surface 46 is close, the value of the conversion constant k becomes small.

5 and 6, assuming that the illuminance required at the working surface 46 is at least 420 lux, the measured illuminance value should be at least 30 lux when the value of the conversion constant k is 14. .

5 and 6, the measured illuminance value rises by a very constant value when it is ON, compared to the measured illuminance value when the luminaire is OFF, so that only by turning on the luminaire, 46) can increase the illuminance by a certain value. However, it is not necessary to keep the luminaire excessively bright, and when the illuminance of the work surface 46 does not reach 420 lux, the luminance of the luminaire needs to be increased to only 420 lux, and when the illuminance of the work surface 46 exceeds 420 lux, The brightness of the luminaire is lowered until it reaches 420 lux. In addition, the lighting fixture may be adjusted based on 30 lux based on the measured illuminance value. Here, the reference illuminance value is 30 lux, which is an illuminance value used as a reference for controlling the lighting fixture.

That is, when the actual illuminance value of the working surface 46 corresponds to the required minimum illuminance value (eg, 420 lux), the illuminance value (eg, 30 lux) measured by the illuminance sensor 22 is determined based on the reference illuminance value (eg, 30). lux), and in this case, when the measured illuminance value is less than the reference illuminance value, the control is performed to gradually increase the brightness of the luminaire so as to approach the reference illuminance value. On the contrary, when the measured illuminance value exceeds the reference illuminance value, the control is performed to gradually lower the luminance of the luminaire so as to approach the reference illuminance value.

The luminaire according to the invention automatically adjusts the illuminance of the working surface 46 in this way, and this control is made by the controller 30.

According to the above control, it is not necessary to turn on the luminaire to the maximum luminous intensity, and only increase the luminous intensity of the luminaire until the measured illuminance value becomes the reference illuminance value, so that the interior space is continuously maintained so that the illuminance above the desired illuminance of the operator is desired. While controlling, power consumption can be reduced.

In FIG. 5, when the illuminance is not turned on, the time when the measured illuminance value is less than 30 lux is 8:00 to 9:15, around 10:15, and about 15:30 to 18:00, based on the normal office hours. In this case, during the time period when the measured illuminance value is less than 30 lux, the lighting fixture is operated to adjust the measured illuminance value to 30 lux.

On the other hand, Figure 6 is the experimental data for the luminaire installed farther from the window than Figure 5, the measured illuminance value was measured to less than 30 lux in almost all time zones. Therefore, the lighting fixture of Figure 6 is adjusted to continue to operate.

Figure 7 is a simplified configuration of the LED lighting fixture capable of automatically adjusting the illumination according to another embodiment of the present invention. According to the luminaire according to the present invention described above, there is a single luminaire having a light emitting module 10, a sensing module 20, and a control unit 30, and a plurality of such luminaires may be arranged in an indoor space. I explained what it is.

However, unlike the embodiment illustrated in FIG. 7, the lighting fixture has a plurality of light emitting modules 10A to 10I, and the sensing module 20 is mounted for each light emitting module 10A to 10I. An independent control unit 30 may be provided to control the light emitting modules 10A to 10I. In the exemplary embodiment illustrated in FIG. 7, the light emitting module in which the measured illuminance value lower than the reference illuminance value is sensed by the illuminance sensor 22 mounted among the plurality of light emitting modules 10A to 10I is controlled to increase the luminous intensity. In addition, the light emitting module in which the measured illuminance value higher than the reference illuminance value is sensed is controlled to lower the luminance.

However, when the measured illuminance value measured by the illuminance sensor 22 is different from the standard illuminance value and the brightness of the light emitting module 10 is increased or decreased temporarily, the brightness of the room suddenly becomes bright or suddenly dark, and thus the room where the luminaire is installed. The person or worker who stays is very tired and has a problem of low concentration. This problem is especially aggravated when glare occurs.

Therefore, it is necessary to gradually raise and lower the brightness to the extent that it cannot be visually recognized. Experimentally, if the brightness after 20 seconds is raised to 1.2 to 1.3 times higher than the brightness at a specific moment, or conversely, if the brightness after 20 seconds is lowered to be 1 / 1.2 to 1/3 times as high as the brightness at a particular moment, The eye cannot feel the elevation of the brightness, and thus there are no side effects such as eye fatigue and decreased concentration.

The brightness is more preferably increased to 1.24 times per 20 seconds or lowered to 1 / 1.24 times per 20 seconds.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not to be limited to the details thereof and that various changes and modifications will be apparent to those skilled in the art. And various modifications and variations are possible within the scope of the appended claims.

2: frame 10, 10A-10I: light emitting module
12: LED 14: substrate
16: reflector 20: sensing module
22: illuminance sensor 24, 24a, 24b, 24c: blocking structure
30 control unit 42 ceiling
44: floor 46: working surface

Claims (10)

A light emitting module having at least one LED and emitting light toward a working surface which is a reference for illuminance measurement;
A sensing module mounted on the light emitting module and having an illuminance sensor measuring the illuminance of the working surface; And
A control unit for gradually increasing or decreasing the brightness of the LED such that the measured illuminance value is closer to the reference illuminance value by comparing the measured illuminance value, which is the illuminance of the working surface measured by the illuminance sensor, with a preset reference illuminance value; Equipped,
In order to accurately measure the illuminance of the working surface, the sensing module has a blocking structure for shielding the illuminance sensor from the light emitted from the light emitting module,
Illumination detection width (2θ) for the working surface of the illuminance sensor corresponds to the lighting area that can be in charge of the luminaire LED lighting fixture. The method of claim 1,
The sensing module is an LED luminaire, characterized in that installed on the surface on which the LED is installed. The method of claim 1,
The light emitting module further includes a diffusion plate disposed to be spaced apart from the LED in the direction in which light is emitted,
The sensing module is an LED luminaire, characterized in that installed on the diffusion plate. delete The method of claim 1,
The blocking structure is an LED luminaire, characterized in that it extends toward the working surface surrounding the illumination sensor so as not to cover the space between the illumination sensor and the working surface. delete The method of claim 1,
LED illumination device, characterized in that the blocking structure is formed to extend toward the working surface so that the illuminance detection width (2θ) is 50 ° ~ 80 °. 6. The method of claim 5,
The blocking structure has a circular cross section or polygon in the horizontal cross-section, the width of the horizontal cross-section LED lighting fixture characterized in that it is kept constant or larger along the direction extending toward the working surface. The method of claim 1,
And the control unit increases or decreases the brightness of the LED by 1.2 to 1.3 times every 20 seconds so that the measured illuminance value approaches the reference illuminance value. The method of claim 1,
The light emitting module is composed of a plurality of sensing modules are mounted for each light emitting module,
The control unit controls the light emitting module in which a measured illumination value lower than the reference illuminance value is detected by an illuminance sensor mounted among the plurality of light emitting modules to increase the brightness, and the light emitting module in which the measured illuminance value higher than the reference illuminance value is detected. LED lighting fixture, characterized in that the control to lower the brightness.

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