All LED, CFL, induction, HPS and HID lighting fixtures requiring instant response dusk-to-dawn control Enhanced 360 joule MOV surge device provides protection against unpredictable line voltage spikes Superior light sensing technology driven by a non-drifting filtered silicon sensor designed for extreme accuracy and human eye response Circuit board protection enhanced with conformal coating to protect against extreme weather elements and moisture Long life components exceeding the 20 yr long life requirement found on most LED fixtures