| 摘要 |
PROBLEM TO BE SOLVED: To reduce influence of the external light or the like, and prevent the formation of a dark area by controlling lamp output of a lamp lighting means by a control part by inputting detecting signals from plural light sensors arranged in response to at least separated two places of a luminaire main body. SOLUTION: An irradiating opening 15, a reflector 17 and a lamp socket 16 connected to a fluorescent lamp 11, are arranged inside a ceiling surface installing flange part 14 formed on the lower end peripheral edge of an embedded part 13 of a luminaire main body 12 to a ceiling surface. Frame bodies 22 of sensor units 21 arranged on the lengthwise directional both ends of the luminaire main body 12 have decorative surface parts 24 having window frames 25 and embedded surface parts 23. A control part in the luminaire main body 12 or the sensor units 21 controls lamp output by an inverter circuit as a lamp lighting means on the basis of detecting signals from light sensors 26a and 26b arranged so as to face to the inside of the window frames 25, and copes with energy-saving in a daytime time zone. It may be controlled by detecting signals of the light sensors detecting the darkest area. |
