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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 MP39056 MP39057
MP39058 MP39030 Area Lighting CPGI-ALR-LC-120 Photocontrol
AmerTac SLC4CB-4 Dusk to Dawn Light Control Socket MP39040 AmerTac 758CTC-4 Dusk to Dawn Post Eye Light Control
Area Lighting CPGI-ALR-AA-305 Post Security Photocontrol AmerTac LC120BC-4 Dusk to Dawn Twist Lock Light Control MP39069
Area Lighting CPGI-ALR-PL-120S Photocontrol AmerTac 758M Post Eye Light Control Area Lighting CPGI-ALR-AA-105 Post Collar Photocontrol
Area Lighting CPGI-ALR-PL-120S- Photocontrol MP39060 MP39010
MP39070 MP39042 AmerTac SLC5BCW-4 Dusk to Dawn Light Control Socket
Area Lighting CPGI-ALR-LC-208-2 Thermal Bimetal Photocontrol AmerTac OLC5CFLBC-4 Dusk to Dawn Floodlight Control Photocell MP39052
MP39062 MP39012 MP39032
Area Lighting CPGI-ALR-TL-115 Swivel Mount Photocontrol MP39050 MP39053
AmerTac SLC6CBC-4 Programmable Light Control Socket Area Lighting CPGI-ALR-SPT-15 Thermal Bimetal Photocontrol Area Lighting CPGI-ALR-AA-105W Post Collar Photocontrol
Westek AT15BC-4 Dusk to Dawn Stem Mount Light Control MP39011 MP39022
MP39051 Area Lighting CPGI-ALR-OLC-5C Photocontrol Amertac SLC2BCB3-4 Light-Sensing Socket Reducer Socket Adapter
MP39106 MP39013 HLP Photocontrol, Twist Lock MV Utility (Long Life Version), 120-277VAC, 1.5fc T
MP39100 MP39104 Heathco HZ-5690-AL Light Fixture Arm Extension
MP39102 MP39101 MP39107
MP39103 Bell 5638-5 Swivel Mount Photocontrol MP88060

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.