| 摘要 |
PROBLEM TO BE SOLVED: To adjust color tone and/or a light volume in accordance with external light brightness of surroundings without the need of separately providing photometric elements.SOLUTION: The lighting system includes a plurality of light sources (LEDw, LEDo) with different light-emitting colors of which one is a diode for both emitting and receiving light (LEDo) used for switching between emitting light and receiving light, and a light control circuit (100, R1 to R4, Q1 to Q3, Q5) for controlling a light-emitting state of the plurality of light sources (LEDw, LEDo) in accordance with light-receiving outputs of the diode for both emitting and receiving light (LEDo). The light control circuit includes a means (100) for correcting the light-emitting state of the plurality of light source (LEDw, LEDo) in accordance with a temperature of the diode for both emitting and receiving light (LEDo). |
