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Light sensors, also known as photocells, are used in various industrial, commercial and residential applications. Like many other sensor technologies, photo detectors help save energy and money by automatically turning lights on and off. A photo detector senses when the sun is setting or rising and turns fixtures such as outdoor street lamps on or off based on the time of day. At 1000Bulbs.com we offer light sensors in various designs, including lock-type mounting, stem mounting, stem and swivel mounting, fixed position mounting and receptacles. Search our selection to find the right technology for your needs. If you have any questions or concerns regarding our product, don't hesitate to contact customer service and talk to our experts!