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Photocells


Photocells are a type of sensor designed to detect the presence of light. They are small inexpensive accessories that can be used with light fixtures to turn them on or off depending on the time of day. We offer many different types and styles of photocells in our Lighting category.
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MP39063 MP39056 MP39057
MP39058 MP39030 Area Lighting CPGI-ALR-PL-120S- Photocontrol
MP39040 MP39069 MP39060
MP39010 MP39070 MP39042
MP39062 MP39012 MP39020
MP39032 Area Lighting CPGI-ALR-OLC-5C Photocontrol MP39050
MP39053 MP39011 MP39022
MP39051 MP39013 Bell 5638-5 Swivel Mount Photocontrol
MP39072
   
 
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History of Photocells


The modern photocell has remained mainly unchanged since they were first invented and introduced over 40 years ago. The main reason they were invented was to control outdoor lighting fixtures so that they were lit dusk to dawn, therefore saving power and the bulb's lifespan. The operation of a photocell is fairly simple. There is a current flowing through a closed electromagnetic relay. When the cell is exposed to sunlight the resistance is zero and therefore there is no current flowing to the fixture. When the sunlight is gone the opposite happens and power flows freely to the light.