| 摘要 |
<p>PROBLEM TO BE SOLVED: To reduce self-flashing of a lighting equipment. SOLUTION: For the lighting equipment, controlling a light source 2 like a light emitting diode by lighting when environment becomes dark, and controlling a light source 2 by turning off when environment becomes light, by detecting the lightness of the environment by a light sensor 1 like a cds, an optical filter 3 with a property of practically blocking the spectrum of the light source 2, and transmitting a part of solar light spectrum, is installed in front of the light sensor 1.</p> |
