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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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LITE SENSOR-IN/OUT LITE SENSOR-IN/OUT
Our Price: $9.09
LITE SENSOR IN/OUT LITE SENSOR IN/OUT
Our Price: $9.09
PHOTO CONTROL-TWIST PHOTO CONTROL-TWIST
Our Price: $11.10
LITE SENSOR-OUTDOOR LITE SENSOR-OUTDOOR
Our Price: $12.81
PHOTO EYE FACE PLATE PHOTO EYE FACE PLATE
Our Price: $12.98
LITE SENSOR-SWIVEL LITE SENSOR-SWIVEL
Our Price: $13.09
Our Price: $18.24
   
 
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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.