LIGHTING SYSTEM

摘要

PROBLEM TO BE SOLVED: To set a turn-off time or a dimmer time of an illuminating lamp lighted after sunset to the almost constant time regardless of the sunset time by using a simple time measuring timer and an illuminace detecting sensor without providing an expensive timekeeping function in a lighting system to light, put out and dim the illuminating lamp according to the existence of a human body and illuminace in a control range by providing a human body detecting sensor and the illuminance detecting sensor. SOLUTION: The time to turnoff an illuminating lamp 50 is set almost constant by using a timer means 61 to measure a prescribed time after the sunset and a timer correcting means 62 to correct time measured by its timer means 61 according to the sunset time. The timer correcting means 62 corrects time measured by the timer means 61 so as to shorten lighting time of the illuminating lamp 50 after the sunset as a value by measuring the sunshine time in a day (or for several days) becomes long and lengthen lighting time of the illuminating lamp 50 as its value becomes short.