Dusk-to-dawn roadway, area and parking lot lighting. Areas with variable sky conditions. Floodlights and security lighting. Ideal for LED fixtures totaling 1650 W @ 277 V AC. Non-drifting silicon light sensor IR filtered for human eye response. Zero-cross technology helps device withstand severe in-rush current and extend relay life. Exceeds 10000 ON/OFF operations at full load, to meet life expectancy of LED fixtures. Conformally coated PCB for extended life. All components meet 15-year life requirements. ANSI C136.10-2010 compliant CSA certified to both U.S. (UL773) Canadian (TIL A15) safety standards.