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, featuring a silicone photosensor instead of the standard CdS photocell. Includes 380 joule MOV surge protection and is rated for 480VAC, 50/60Hz When a job demands the highest quality light sensors, trust in the reliable name of TORK, a pioneer in the industry since 1922.