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A photoswitch, or photo-electric switch, is a sensor that detects the presence in or change of light. Photoswitches are used in a variety of places from scientific applications to residential light timers. A photo-electric cell is connected to a circuit that measures how much electricity the cell produces and according the setting of minimum and maximum lux level, the circuit decides and gives the output.
The issue of the photoswitch that the reflecting efficiency of the reflecting member may be drastically lowered due to dewing and clouding of the reflecting surface due to a change in the ambient temperature. The dew on the reflecting surface causes a random reflection. In order to avoid the clouding of the reflecting surface, it has been proposed to apply silicon or the like to the surface of the reflecting member. This countermeasure, however, cannot prevent condensing of dew onto the lower part of the reflecting surface. Thus, there are many problems in the prior art.
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