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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 External mount twist lock photocontrol shorting cap TL-SC by Howard Lighting MP39056
MP39057 MP39058 MP39030
Area Lighting CPGI-ALR-LC-120 Photocontrol Area Lighting CPGI-ALR-ACL-11 Photocontrol Area Lighting CPGI-ALR-PL-120S- Photocontrol
Area Lighting CPGI-ALR-AA-305 Post Security Photocontrol MP39040 Area Lighting CPGI-ALR-PL-120S Photocontrol
Area Lighting CPGI-ALR-AA-105 Post Collar Photocontrol MP39069 MP39060
MP39010 MP39070 MP39042
Area Lighting CPGI-ALR-SPT-15 Thermal Bimetal Photocontrol Area Lighting CPGI-ALR-TL-115 Swivel Mount Photocontrol MP39052
MP39062 MP39012 MP39020
MP39032 Area Lighting CPGI-ALR-AA-105W Post Collar Photocontrol Area Lighting CPGI-ALR-OLC-5C Photocontrol
MP39050 MP39053 MP39011
MP39022 MP39051 MP39013
Bell 5638-5 Swivel Mount Photocontrol MP39072

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.