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Galaxy® Commercial 1000 watt 208-240 volt ballast can operate a 1000 watt HPS, MH or DE lamp at 50%, 75%, 100% or 110% settings. The Galaxy® Commercial ballast comes pre-wired with a Sun System® lamp cord receptacle. It is compatible with all Sun System® branded reflectors. Includes a 6 ft 240 volt power cord. Efficient >98% PF operates 1000 watt HPS/MH and DE lamps, smart start feature, fully sealed extruded aluminum housing, lightweight and quiet operation. Compliant with FCC Article 18 Part A (governs commercial use) as tested by an independent US testing lab in a true as used configuration. Operates at 72 kHz.