| 摘要 |
<p>PROBLEM TO BE SOLVED: To improve the waterproofing property of an illuminance detecting light receiving surface with a simple structure by incorporating, in an illumination lamp globe, the illuminance detecting light receiving surface of a luminaire having an automatic flasher unit which is turned on when the illuminance becomes less than a constant value and turned off only by a timer using that point of time as a starting point. SOLUTION: Because a lamp 12 and a lamp socket 13 need waterproofing, rubber packing 16 is provided between a globe 11 and a luminaire body 15 so that the waterproofing is realized. Thereby, because an illuminance detector light receiving surface 14 is arranged in a rainproofed space, it is not necessary to add a new rainproof structure for the illuminance detector. In addition, ambient illuminance can be detected through the globe 11 in turning on the lamp without any problem because the glove 11 is so formed as to be transparent or translucent for visible light. Additionally, while the lamp is being lit, the ambient illuminance can not be detected due to the light from the lamp, it is turned off by a timer regardless of the illuminance.</p> |
