| 摘要 |
<p>PROBLEM TO BE SOLVED: To control the power source of a luminaire, based on the brightness in the illumination region of a luminaire, and easily apply to a commercial luminaire without requiring specific construction work. SOLUTION: A power supply unit 20 capable of supplying a power source of a luminaire 30 and stopping the supply of it is arranged between the luminaire 30 and the power source, and a brightness detecting unit 10 is arranged in the illumination region of the luminaire 30. A photodiode is arranged in the brightness detecting unit 10 so as to receive the surrounding light through a window part 19 formed in a case, and when the output of the photodiode is lowered to the specified reference value or less, an infrared signal for turning on the power supply is sent from an infrared transmitter to a power source unit 20. The power supply unit 20 receives the infrared signal transmitted from the brightness detecting unit 10, and supplies power to the luminaire 30 to light the luminaire 30.</p> |
