Photocontrol devices use photocells to determine ON/OFF status of outdoor lighting based on the ambient light level.
While generally understood as responding to visible light, some photosensors also respond to infrared (IR) and ultraviolet (UV) radiation.
Normally used for roadway, area, parking, flood and security lighting, photocontrols automatically control the ON/OFF cycle to optimize the effectiveness of the lighting and maximize energy savings.
In daylight harvesting applications, the photocontrol is mounted inside the occupied space (eg, classroom) and it sends light level information to a control module. The control module uses this information to modulate the electric light output either by raising or lowering the light output by controlling, most often, the dimming ballast.
This system allows the total light inside the space to remain stable throughout the day ¨C optimized light for the occupants and energy savings for the facility.
Photocontrols Designed for Traditional Light Sources Will Not Work with LED Of significant importance today is the compatibility of photocontrols for LED light fixtures. All it takes is a quick online search for "can photocells be used with LEDs" to discover a broad range of lighting forums, electrical contractor news feeds and other sources expressing complaints about how their photocontrol set-up does not work with LED fixtures.
Traditionally, photocontrol manufacturers only had to design there controls to work with tungsten (incandescent / halogen) and ballasted (fluorescent / HID) lighting loads. It turned out that these traditional photocell devices did not work, or did not work very well, with LED.
Eventually the manufacturers caught up. They learned about the unique electrical characteristics of LED and built the required control capabilities into their devices.
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