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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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MP39056 MP39057 MP39058
AmerTac SLC4CB-4 Dusk to Dawn Light Control Socket MP39030 Area Lighting CPGI-ALR-LC-120 Photocontrol
AmerTac 758M Post Eye Light Control AmerTac 758CTC-4 Dusk to Dawn Post Eye Light Control AmerTac LC120BC-4 Dusk to Dawn Twist Lock Light Control
AmerTac SLC5BCW-4 Dusk to Dawn Light Control Socket Area Lighting CPGI-ALR-ACL-11 Photocontrol MP39040
AmerTac 758FPCTCC-4 Dawn Light Control Area Lighting CPGI-ALR-PL-120S- Photocontrol Area Lighting CPGI-ALR-AA-305 Post Security Photocontrol
AmerTac OLC5CFLBC-4 Dusk to Dawn Floodlight Control Photocell Area Lighting CPGI-ALR-PL-120S Photocontrol Area Lighting CPGI-ALR-AA-105 Post Collar Photocontrol
AmerTac SW103CTC-4 Dusk to Dawn Swivel Eye Light Control Area Lighting CPGI-ALR-LC-208-2 Thermal Bimetal Photocontrol AmerTac SLC6CBC-4 Programmable Light Control Socket
MP39010 MP39042 Westek AT15BC-4 Dusk to Dawn Stem Mount Light Control
MP39052 MP39062 MP39012
MP39020 MP39032 Amertac SLC2BCB3-4 Light-Sensing Socket Reducer Socket Adapter
Area Lighting CPGI-ALR-SPT-15 Thermal Bimetal Photocontrol Area Lighting CPGI-ALR-TL-115 Swivel Mount Photocontrol MP39050
MP39053 Area Lighting CPGI-ALR-AA-105W Post Collar Photocontrol Area Lighting CPGI-ALR-OLC-5C Photocontrol
MP39011 MP39022 MP39051
MP39013 Heathco HZ-5690-AL Light Fixture Arm Extension HLP Photocontrol, Twist Lock MV Utility (Long Life Version), 120-277VAC, 1.5fc T
Heath Zenith HZ-5697 Dusk to Dawn Replacement Photo Control Twist Lock 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.