| abstract |
(57) [Abstract] [PROBLEMS] To provide a lighting system that has a correlation with the transition of the amount of sunlight and is capable of adjusting a biological rhythm and easily maintaining an arousal level. SOLUTION: A light receiving section 1 is correlated (proportional) with the amount of sunlight. To generate a voltage signal. Comparison unit 7 of power control unit 2 Outputs a control signal of "H" when the reference voltage V 0 of the reference waveform generating section 6 is higher than the voltage signal from the light receiving section 1. The lighting device 4 sets the lighting power (dimming degree) of the lighting load 5 according to the width of the control signal. The lighting device 4 receives the amount of light received from the sun (external light) according to the width of the input control signal. The lighting power to be supplied to the lighting load 5 is set so that the illuminance of the indoor, which is the illumination target, changes in proportion to the change of In other words, when the amount of received light decreases and the width of the control signal increases, the lighting power is correspondingly reduced to decrease the illuminance, and conversely when the amount of received light increases and the width of the control signal decreases, the lighting power increases and To raise. |