TORK turn-lock photocontrol light sensors meet the most stringent safety and accuracy certifications for reliable use on roadways, bridges and general commercial facilities. Use this light sensor to turn on road lighting from dusk to dawn. The delayed OFF response prevents false switching from passing headlights and the sensor's UV stabilized polycarbonate housing and window maximizes protection against extreme weather elements and moisture. This light sensor provides superior accuracy and is calibrated to duplicate a human eye response. Other features include surge protection, UL Listed DC relay and compatibility with 105-130VAC, 50/60Hz, 1000W loads. When a job demands the highest quality light sensors, trust in the reliable name of TORK, a pioneer in the industry since 1922.