KR101097048B1 - Method and apparatus for test of LED brightness by illumination sensor - Google Patents

Method and apparatus for test of LED brightness by illumination sensor Download PDF

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KR101097048B1
KR101097048B1 KR1020100011411A KR20100011411A KR101097048B1 KR 101097048 B1 KR101097048 B1 KR 101097048B1 KR 1020100011411 A KR1020100011411 A KR 1020100011411A KR 20100011411 A KR20100011411 A KR 20100011411A KR 101097048 B1 KR101097048 B1 KR 101097048B1
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led
light emitting
emitting diode
brightness
sensor
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KR1020100011411A
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Korean (ko)
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KR20110092006A (en
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천진민
이기복
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케이엠아이시스템 (주)
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  • General Physics & Mathematics (AREA)
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  • Testing Of Optical Devices Or Fibers (AREA)
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Abstract

The present invention relates to a light emitting diode (LED) brightness inspection device and an inspection method using an illuminance sensor, the illumination sensor for checking whether the brightness of the light emitted from each light emitting diode (LED) provided in the light emitting diode (LED) module is normal The present invention relates to a light emitting diode (LED) brightness inspection apparatus and an inspection method. A light emitting diode (LED) module 700 having a plurality of light emitting diodes (LEDs) is mounted, and a measuring device 100 for measuring the brightness of each light emitting diode (LED) provided in the light emitting diodes (LED) module 700. )Wow; A multiplexer circuit unit 200 which scans and reads the resistance output of each of the measured light emitting diodes (LEDs); A resistance measuring meter (Meter) 300 measuring the resistance value of each light emitting diode (LED); A light emitting diode (LED) light conductance range of normal conductance value is input in advance, converts the measured resistance value into conductance value and compares it with the value of the normal range to a computer 400 for determining pass or failure. It is composed. Therefore, the present invention can improve the discrimination power by determining the brightness of the light emitting diode (LED) by using an illuminance sensor as an electrical signal, and can easily cope with changes in the inspection specifications, and emit light at a relatively low cost. There is an effect that can determine whether the brightness of the diode (LED) is normal.

Figure R1020100011411

Description

LED brightness test device and method using illumination sensor {Method and apparatus for test of LED brightness by illumination sensor}

The present invention relates to a light emitting diode (LED) brightness inspection device and an inspection method using an illuminance sensor, and more particularly, whether the brightness of the light emitted from each light emitting diode (LED) provided in the light emitting diode (LED) module is normal. The present invention relates to a light emitting diode (LED) brightness inspection device and an inspection method using an illumination sensor for inspecting.

A light emitting diode (LED) is a semiconductor device that emits light when a voltage is applied in the forward direction. The light emitting principle uses an electroluminescent effect, and the color of light varies depending on the material used, and emits light from ultraviolet to visible and infrared light. It can manufacture the thing.

The technology using the LED is currently used in many fields, such as lighting devices, advertising signs, traffic signal devices and home appliances such as televisions, and the light emitting diode (LED) module produced has passed or failed each LED brightness. For the determination, as shown in FIG. 1, a brightness inspection method using a camera and a naked eye inspection method using the naked eye are used.

The method of inspecting brightness by the camera is configured to inspect 5 to 6 light emitting diode (LED) images with one camera at a time, as shown in FIG. ) Determine the luminance.

The visual inspection method is a method in which the worker visually inspects a state in which a worker opens or closes a low current cover on a light emitting diode (LED) module as shown in FIG.

However, the inspection method using the camera image as described above is expensive because the inspection apparatus is expensive, the visual inspection method is not excellent discrimination because the inspection is made by the operator, when changing the inspection specification (Spec) There is a problem that is not easy to respond.

In order to solve the problems described above, in the present invention, it is possible to improve the discrimination power by determining the brightness of the light emitting diode (LED) by using an illuminance sensor as an electrical signal, and easily respond even if the inspection specification is changed. It is possible to provide a light emitting diode (LED) light inspection device and an inspection method using an illuminance sensor that can determine whether the brightness of the light emitting diode (LED) is normal at a relatively low cost.

As a configuration for achieving the object is equipped with a light emitting diode (LED) module is provided with a plurality of light emitting diodes (LED), a measuring device for measuring the brightness of each light emitting diode (LED) provided in the light emitting diode (LED) module Wow; A multiplexer (Mux) circuit unit configured to scan and read the resistance output of each measured light emitting diode (LED) brightness; A resistance measuring meter (Meter) for measuring the resistance value of each light emitting diode (LED); A light emitting diode (LED) light conduction range of normal conductance value is input in advance, and the measured resistance value is converted into conductance value, and is compared with the value of the normal range, and comprises a computer for determining pass or failure.

A method for achieving the object may include a tenth step of inputting a conductance value range in which a light level of light of a light emitting diode (LED) is normal into an input terminal of a computer; The power is applied to the light emitting diode (LED) module mounted in the mounting jig so that each light emitting diode (LED) generates light, so that the illumination sensor provided on the top of each light emitting diode (LED) measures light brightness. Steps; A thirtieth step of scanning and reading a resistance output of each light emitting diode (LED) measured by a multiplexer (Mux) circuit portion electrically connected to the illumination sensor; A step (40) of measuring the resistance values of each LED by a resistance measuring meter and transmitting the resistance values of each LED to a database of a computer through communication; A fifty step of converting a resistance value transmitted from an illuminance converter into a conductance value when an input signal is generated for each LED resistance value to the database; The converted conductance value is compared with the conductance value of the normal range stored in the database in the comparison analysis unit to determine pass or failure for each light emitting diode (LED) provided in the light emitting diode (LED) module and to display a computer screen or sound. The sixth step of outputting.

As described above, the present invention can improve the discrimination power by determining the brightness of the light emitting diode (LED) by using an illuminance sensor as an electrical signal, and can easily cope with changes in the inspection specifications, and relatively inexpensive. There is an effect that can determine whether the brightness of the light emitting diode (LED) is normal at cost.

1 is a reference view showing a conventional light emitting diode (LED) inspection method.
2 is a schematic configuration diagram of a light emitting diode (LED) brightness test apparatus using an illumination sensor according to the present invention.
3 is a perspective view of a light emitting diode (LED) brightness measuring apparatus using an illuminance sensor according to the present invention.
Figure 4 is a front view of the light emitting diode (LED) brightness measuring device using an illumination sensor according to the present invention.
5 is a plan view of a light emitting diode (LED) brightness measuring device using an illumination sensor according to the present invention.
Figure 6 is a side view of the light emitting diode (LED) brightness measuring device using an illumination sensor according to the present invention.
Figure 7 is a view showing the internal configuration of the transfer plate and the ball screw in accordance with the present invention.
8 is a view showing a vertical transfer state of the transfer plate according to the present invention.
9 is a flow chart of a light emitting diode (LED) brightness test method using an illumination sensor according to the present invention.
10 is an embodiment of giving a serial number when measuring the brightness value of each light emitting diode (LED) using an illuminance sensor according to the present invention.
11 is a reference diagram showing the brightness test results of the light emitting diode (LED) module using the illumination sensor according to the present invention.

2 is a schematic configuration diagram of a light emitting diode (LED) brightness test apparatus using an illuminance sensor according to the present invention, Figure 3 is a perspective view of a light emitting diode (LED) brightness measuring apparatus using an illuminance sensor according to the present invention, 4 is a front view of a light emitting diode (LED) brightness measuring apparatus using an illuminance sensor according to the invention, Figure 5 is a plan view of a light emitting diode (LED) brightness measuring apparatus using an illuminance sensor according to the invention, Figure 6 Side view of the light emitting diode (LED) brightness measuring device using the illumination sensor according to the present invention, Figure 7 is a view showing the internal configuration of the transfer plate and the ball screw according to the invention, Figure 8 is a vertical transfer of the transfer plate according to the present invention 9 is a flowchart illustrating a light emitting diode (LED) brightness inspection method using an illuminance sensor according to the present invention, and FIG. 10 is an illuminance sensor according to the present invention. An embodiment in which a serial number is assigned when measuring the brightness value of each light emitting diode (LED), and FIG. 11 is a reference diagram showing a brightness test result of a light emitting diode (LED) module using an illuminance sensor according to the present invention.

Hereinafter, the components will be described with reference to the drawings.

2 is a schematic configuration diagram of a light emitting diode (LED) brightness test apparatus using an illuminance sensor of the present invention, the measuring device 100 for measuring the brightness of the light emitting diode (LED) module 700, and the measuring device ( It is composed of a multiplexer (Mux) circuit unit 200 and an electrical resistance meter (Meter 300) electrically connected to the 100, and a computer 400 is communicatively connected from the resistance meter (300).

The illuminance sensor includes all sensors capable of determining the brightness of light, including a CDS and a photodiode.

The measuring device 100 is equipped with a light emitting diode (LED) module 700 is provided with a plurality of light emitting diodes (LED), the brightness of each light emitting diode (LED) provided in the light emitting diode (LED) module 700 The multiplexer (Mux) circuit unit 200 scans and reads the resistance output of each measured light emitting diode (LED) brightness, and the resistance measuring meter (Meter) 300 reads each light emitting diode (LED). ) The resistance value is measured, and the computer 400 inputs a conductance value range in which the light of the light emitting diode (LED) is normal is input in advance, and converts the measured resistance value into a conductance value and the value of the normal range. By comparison, pass or fail is determined.

3 to 6, the measuring device 100 includes a base plate 110 provided on a bottom surface and a left and right ends of the upper surface of the base plate 110 as shown in the perspective view, the front view, the top view, and the side view of FIGS. 3 to 6. A pillar 120 to be fixed and guide grooves 131 are formed at both front and rear sides of the left and right ends of the pillar 120 in both vertical directions to be fastened by bolts B, respectively.

Both sides of the fixing plate 140 are fastened to the rear surface of the left and right end pillars 120, and a mounting panel 141 protrudes from one side of the rear center portion of the fixing plate 140 to protrude the mounting panel 141. The motor 150 is mounted on the surface, and the motor shaft 151 into which the bearing 152 is inserted protrudes from the motor 150.

In addition, the front surface of the fixing plate 140 is provided with a ball screw 160, the fixing block 161 is fastened to the upper portion of the front center of the fixing plate 140, the bolt (B), the outer peripheral surface on the fixing block 161 The ball screw 160 in which a spiral groove is formed in a predetermined section is inserted in the vertical direction, and the lower one side of the ball screw 160 is provided in the vertical direction is provided with an impact absorbing member 164 on the upper side, A spiral groove is formed so that the transfer block 163 is vertically conveyed by the rotation direction of the ball screw 160 is inserted, the bearing 162 is inserted into the ball screw 160 protruding to the upper end of the fixed block 161. do.

A driving belt 170 is provided at both ends of outer surfaces of the bearings 152 and 162 of the motor 150 and the ball screw 160 to fix the rotational force of the motor shaft 151 according to the driving of the motor 150. 161 is transferred to the ball screw 160 protruding upward to control the shanghai transport of the transfer block 163, the motor 150 may use a servo motor capable of forward or reverse control.

The transfer block 163 is formed on the front of the transfer block 180 to be fastened up and down by fastening the bolt (B), the guide member 181 is provided on the rear left and right ends, respectively, the LM Guide (LM Guide) 130 The protrusion 181a is inserted into the guide groove 131 of the guide plate 131, and the guide groove of the LM Guide 130 is transferred during the transfer of the transport plate 180 which is linked to the shanghai transport of the transport block 163. The projection 181a inserted into the 131 helps to enable a smooth transfer.

In addition, a sensor fixing part 182 is provided at a lower front surface of the transfer plate 180, and each light emitting diode (LED) is provided at a light emitting diode (LED) module 700 at a lower surface of the sensor fixing part 182. The illuminance sensor 185 is provided at regular intervals to measure the brightness of the light, and the bottom of the sensor fixing part 182 in which the illuminance sensor 185 is provided is partitioned for each illuminance sensor 185 as shown in the enlarged view of FIG. 4. 183, and blocks light from adjacent left and right light emitting diodes (LEDs) when measuring brightness of the light emitting diodes (LEDs), and transmittance adjusting cover 184 is provided on the left and right partitions 183 on one side of the lower side of the illuminance sensor 185. ) Is further provided to reduce brightness when too bright LED light is generated.

At the bottom of the sensor fixing part 182 in which the illumination sensor 185 is provided, a mounting jig 190 is fixed at both ends of the pillar 120 to mount the light emitting diode (LED) module 700 thereon.

The computer 400 includes a database 410 in which conductance values in a normal range and resistance values for each light emitting diode (LED) measured by the light emitting diode (LED) module 700 are stored, and the resistance measuring meter ( The communication unit 420 receiving the resistance value measured from the meter 300, the multiplexer control unit 430 driving the multiplexer circuit unit 200, and the transmitted resistance value are used as conductance values. It is composed of a roughness conversion unit 440 to convert to, and a comparison analysis unit 450 to determine the pass or fail by comparing the converted conductance value with the conductance value of the normal range stored in the database 410.

FIG. 7 is a view illustrating an internal configuration of the transfer plate 180 of the measuring device 100 and an internal configuration of the measuring device 100 in a state in which the transfer plate 180 is removed, and FIG. LM Guide (130) shows a configuration in which the U-shaped guide member 181 is provided on the rear surface of the transfer plate 180 to be inserted into the guide groove 131, and projections 181a at both ends of the guide member 181 as shown in the enlarged view. It can be seen that is formed in the vertical direction, the fastening hole 186 is fastened to the bolt (B) to the transfer block 163 in the center of the transfer plate 180 is formed.

7 (b) is an internal configuration of the measuring device 100 in which the transfer plate 180 is removed, and a fastening hole 165 is formed at the front of the transfer block 163 to fasten the transfer plate 180. The outer circumferential surface of the ball screw 160 has a spiral groove formed in a predetermined section, so that the transfer block 163 is vertically transferred.

8 is a view showing a vertical transfer state of the transfer plate 180, Figure 8 (a) shows a state in which the transfer plate 180 is transferred to the top, Figure 8 (b) shows that the transfer plate 180 is lower Indicates the state transferred to.

A light emitting diode (LED) brightness test method using the illuminance sensor of the present invention configured as described above will be described with reference to FIG. 9.

A conductance value range in which light emitting diode (LED) light is normal is input to the database 410 of the computer 400, and the conductance value range of the light emitting diode (LED) module 700 to be tested is input. It can be easily modified by an input terminal (a general input device, an input means such as a mouse or a keyboard) according to a working condition such as a characteristic or brightness change (step S10).

After the light emitting diode (LED) module 700 is mounted on the mounting jig 190 in the state where the normal conductance value is set as described above, power is applied to the mounted light emitting diode (LED) module 700 so as to supply each light emitting diode. The LED generates light, so that the illumination sensor 185 provided on the upper portion of each light emitting diode (LED) measures the light brightness (step S20).

At this time, the illuminance sensor 185 for measuring the light brightness of each light emitting diode (LED) has been assigned a serial number from one end, as shown in Figure 10, input to the corresponding illuminance sensor 185 for each light emitting diode (LED) It is easy to know whether the brightness of the light emitting diodes (LEDs) is a passable product or a defective product. The serial number is assigned to the database 410 of the computer 400. For example, 10 light emitting diodes (LEDs) are provided. When the working conditions for testing the light emitting diode (LED) module 700 provided with the serial number from one end of the illumination sensor 185 to 01,02 ... 09,10 are inputted, 20 light emitting diodes (LED) When inputting the working condition for testing the 70 is provided with a serial number from one end of the illumination sensor 185 to 01,02 ... 19,20.

In addition, in the step S20, it is possible to adjust the height between the illumination sensor 185 and the light emitting diode (LED) module 700 according to the brightness level of the light emitting diode (LED) to be measured, which is driven by the motor 150 The conveyance plate 180 fixed to the conveying block 163 conveyed up and down by the rotation direction of the ball screw 160 is linked to the conveying block 163 and the height is adjusted.

The multiplexer (Mux) circuit unit 200 electrically connected to the illuminance sensor 185 scans and reads the resistance output of each measured light emitting diode (LED) brightness (step S30). After measuring the resistance value for the resistance output in the resistance measuring meter (300), the resistance value of each light emitting diode (LED) is transmitted to the database 410 of the computer 400 using communication (step S40). ).

When the input signal for each LED resistance value is generated to the database 410, the resistance value transmitted from the illuminance conversion unit 440 is converted into a conductance value, and the transmitted LED resistance value or converted If the conductance value is somewhat shaken, use it as an average value or filter (step S50).

The converted conductance value is compared with the conductance value of the normal range stored in the database 410 by the comparison analyzer 450 and passes for each light emitting diode (LED) provided in the light emitting diode (LED) module 700. Alternatively, the defect is determined and output to the computer 400 screen or sound (step S60).

FIG. 11 is a reference diagram illustrating a brightness test result of a light emitting diode (LED) module using an illuminance sensor of the present invention. As shown in FIG. In the state set in the database 410, as shown in Fig. 11 (b) by measuring the illuminance of the light emitting diode (LED) located in the second serial number and the light emitting diode (LED) located in the fourth serial number by the step S30 The result of finally determining the pass or failure through the step S60 is shown in Fig. 11 (a), the serial number 2 is passed because the conductance value is located in the normal range, and the serial number 4 is not in the normal range. It can be seen that the failure determination is made because the impact has the conductance value of the position.

Therefore, the present invention can improve the discrimination power by determining the brightness of the light emitting diode (LED) by using an illuminance sensor as an electrical signal, and can easily cope with changes in the inspection specifications, and emit light at a relatively low cost. It may be determined whether the brightness of the diode (LED) is normal.

Although the present invention has been shown and described with respect to specific embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. Anyone who can afford it will know.

100: measuring device 110: base plate
120: pillar 130: LM Guide
131: guide groove 140: fixed plate
141: mounting panel 150: motor
151: motor shaft 152: bearing
160: ball screw 161: fixed block
162: bearing 163: transfer block
164: shock absorbing member 165: fastening hole
170: driving belt 180: transfer plate
181: guide member 181a: protrusion
182: sensor fixing part 183: partition
184: Transmittance adjustment cover 185: Ambient light sensor
186: fastener 190: mounting jig
200: multiplexer (Mux) circuit part 300: resistance measuring meter (Meter)
400: computer 410: database
420: communication unit 430: multiplexer (Mux) control unit
440: roughness conversion unit 450: comparative analysis unit
700: light emitting diode (LED) module B: bolt

Claims (7)

In the light emitting diode (LED) brightness inspection device using an illuminance sensor,
A light emitting diode (LED) module 700 including a plurality of light emitting diodes (LEDs) is mounted, and the brightness of each light emitting diode (LED) provided in the light emitting diodes (LED) module 700 is adjusted to an illuminance sensor 185. A measuring device 100 for measuring;
A multiplexer circuit unit 200 which scans and reads a resistance value of an illumination sensor 185 that varies according to the brightness of each light emitting diode (LED);
A resistance measuring meter (300) for measuring a resistance value of the illuminance sensor (185) which changes according to the brightness of each light emitting diode (LED);
When the light brightness of the light emitting diode (LED) is normal, the conductance value range to be measured by the illumination sensor 185 is input to the computer 400 in advance, and the brightness of the actual light emitting diode (LED) product is transferred to the illumination sensor 185. LED brightness inspection device using a light sensor, characterized in that configured to convert the measured resistance value to the conductance value, and compared with the value of the normal range to determine the pass or failure. The method of claim 1, wherein the measuring device 100
A base plate 110 provided on the bottom surface;
Pillars 120 vertically fixed to the left and right ends of the upper surface of the base plate 110;
An LM guide 130 formed at both front and rear sides of the left and right end pillars 120 in a vertical direction and fastened with bolts B, respectively;
Both ends of the left and right ends of the pillars 120 are fastened to each other by bolts B, and the fixing plate 140 protrudes from one side of the rear center portion.
A motor 150 mounted on an upper surface of the mounting panel 141 and protruding from the motor shaft 151 into which a bearing 152 is inserted;
The fixed block 161 is fastened to the upper portion of the front center of the fixed plate 140 by a bolt (B), and is inserted in the vertical direction to the fixed block 161 and has a shock absorbing member 164 provided at the upper and lower conveyance. Ball screw 160 is inserted into the block 163, the bearing 162 is inserted into the upper projection of the fixed block 161;
A driving belt 170 fixed at both ends to outer peripheral surfaces of the bearings 152 and 162 of the motor 150 and the ball screw 160;
The transfer block 163 is fastened to the front by the bolt (B) is configured to be transported up and down, and the guide member 181 is provided on the left and right rear sides, respectively, the guide groove of the LM Guide (LM Guide) 130 ( The projection 181a is inserted into the 131, and the sensor fixing part 182 is provided at the lower front surface thereof, and each of the light emitting diodes provided in the LED module 700 is provided at the lower surface of the sensor fixing part 182. A transport plate 180 provided with an illumination sensor 185 at a predetermined interval to measure brightness of the LED;
At the bottom of the sensor fixing part 182 provided with the illumination sensor 185 is characterized in that it comprises a mounting jig 190 is fixed at both ends to the column 120 so that the light emitting diode (LED) module 700 is mounted. LED brightness inspection device using an illuminance sensor. The method of claim 2,
The lower part of the sensor fixing part 182 provided with the illuminance sensor 185 is divided into partitions 183 for each illuminance sensor 185 to block the light of adjacent left and right light emitting diodes (LED) when measuring the brightness of the LED. And, the left and right partitions 183 of the lower side of the light sensor 185 is further provided with a transmittance adjusting cover 184, when the too bright light emitting diode (LED) light is generated to reduce the brightness sensor, characterized in that LED brightness tester. The computer of claim 1, wherein the computer 400 is
A database 410 that stores conductance values in a normal range and resistance values for each light emitting diode (LED) measured by the light emitting diode (LED) module 700;
A communication unit 420 receiving the resistance value measured from the resistance measuring meter 300;
A multiplexer control unit 430 for driving the multiplexer circuit unit 200;
An illuminance conversion unit 440 converting the transmitted resistance value into a conductance value;
LED brightness test device using the illumination sensor, characterized in that the comparison analysis unit 450 to determine the pass or fail by comparing the converted conductance value with the conductance value of the normal range stored in the database 410 . In the light emitting diode (LED) brightness inspection method using an illuminance sensor,
A tenth step (S10) in which the conductance value range measured by the illumination sensor 185 is input to the input terminal when the light brightness of the light emitting diode (LED) is normal in the database 410 of the computer 400;
The power is applied to the light emitting diode (LED) module 700 mounted on the mounting jig 190 so that each light emitting diode (LED) generates light, and an illuminance sensor 185 provided on the top of each light emitting diode (LED). A twenty-step S20 of measuring light brightness;
A thirtieth step (S30) of scanning and reading a resistance value of each light emitting diode (LED) measured by the multiplexer circuit unit 200 electrically connected to the illuminance sensor 185;
After measuring the resistance value of each light emitting diode (LED) measured by the illuminance sensor 185 in the resistance measuring meter (300), the resistance of each light emitting diode (LED) to the database 410 of the computer 400. A 40th step (S40) in which a value is transmitted using communication;
A step 50 of converting the resistance value transmitted from the illuminance conversion unit 440 into a conductance value when an input signal is generated for each LED resistance value to the database 410;
The converted conductance value is compared with the conductance value of the normal range stored in the database 410 by the comparison analyzer 450 and passes for each light emitting diode (LED) provided in the light emitting diode (LED) module 700. Or a 60th step (S60) of outputting a computer screen or a sound by determining a defect. 6. The method of claim 5,
The 20th step (S20) is a ball screw driven by the motor 150 to adjust the height between the illumination sensor 185 and the light emitting diode (LED) module 700 according to the brightness degree of the light emitting diode (LED) to be measured ( LED brightness inspection method using the illumination sensor, characterized in that the height adjustment of the transport plate 180 fixed to the transport block 163 is transported up and down by the rotation direction of 160. 6. The method of claim 5,
The 50th step (S50) is an LED brightness test method using the illuminance sensor, characterized in that used as an average value or filtered if the transmitted light emitting diode (LED) resistance value or the converted conductance value is somewhat shaken .
KR1020100011411A 2010-02-08 2010-02-08 Method and apparatus for test of LED brightness by illumination sensor KR101097048B1 (en)

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GB2496450A (en) * 2011-11-14 2013-05-15 Feasa Entpr Ltd A light source testing device which compares a property of light with a predetermined threshold value
KR101448022B1 (en) * 2014-05-26 2014-10-08 한국건설기술연구원 Determining Failings System For Tunnel Luminance Meter and Method Thereof
KR102073558B1 (en) * 2018-07-17 2020-02-05 재단법인 한국기계전기전자시험연구원 Illuminance sensor tester
KR102107184B1 (en) * 2018-12-07 2020-05-06 에코엘이디(주) Light measurment device of LED bar
KR20230152907A (en) 2022-04-28 2023-11-06 신선영 Illumination control apparatus for LED lighting system

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