The Tork ZTL124 Turn-Lock Advanced Led Photocontrol Light Sensor Provides A Simple Way to Control Residential or Commercial Exterior Lights and Appliances Based On The Ambient Light Level. Features Include The Zero-Cross Switching Technology, Enhanced Surge Protection, Silicone Sensor Designed For Human Eye Response and The Coated, Weather-Resistant Circuit Board. Designed For Applications Including Led, CFL, Induction, HPS and Hid Lighting Fixtures In Roadways, Parking Lots, and Security or Flood Lights.