The ZTL series photocontrol is designed with enhanced ZERO-CROSS switching technology allowing it to withstand the high inrush currents commonly found in LED Luminaires. NSI Turn Lock Photocontrol, Instant Response, Series: ZTL, 105 to 305 VAC, 50/60 Hz Frequency, 1000 W Tungsten, 1800 VA Ballast, Molded Sealed Infrared Sensor, Turn On Is 1.5fc to Off-On Ratio Is 1.5:1 Average Sensitivity, Environmental Conditions: -40 to 140 deg F Operating Temperature, Twist-Lock Mounting, Polycarbonate, 2-3/16 in H x 3-3/16 in W Dimensions All LED, CFL, Induction, HPS and HID lighting fixtures requiring dusk-to-dawn control and enhanced protection against extreme inrush currents Ideal for roadway, area, parking, flood and security type lighting fixture Enhanced 510 J MOV surge device providing superior surge protection against unpredictable line voltage spikes Superior light sensing technology driven by a non-drifting filtered silicone sensor designed for extreme accuracy and human eye response Circuit Board protection enhanced with conformal coating to protect against extreme weather elements and moisture Photocontrol designed for 20 year long life requirement found on most LED fixtures