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A photoswitch device is a kind of sensor that detects the presence of light, generally in a certain wavelength. Photoswitches are used for numerous scientific and manufacturing applications. They are also commonly used in residential areas to turn lights on and off based on the time of day. 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.


A photoswitch molecule is a chemical that is sensitive in some way to light, e.g. able to turn on retina cells when exposed to light.[1][2] e.g. AAQ, DENAQ.


The problem of the photo-switch 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.[3]

Popular Culture[edit]

In popular culture (popular culture) Photoswitch shows itself in many places, not least of which is Star Trek. In Episode 207, entitled "Rules of Acquisition", the Ferengi character Quark receives a large load of "Photoswitch" in the early part of the show. From the episode:

Quark's Cousin: Where does this load of Photoswitches go?
Quark: Um, Over there.