This 1000 watt Galaxy Grow Amp operates on 277 volt power. The Select-A-Watt feature allows the ballast to operate a 1000 watt lamp at 600, 750 or 1000 watts and Turbo Charge . It will also properly operate a 600 and 750 watt lamps. Dual universal lamp cord receptacle is compatible with all Sun System brand reflectors as well as other branded reflectors. It features a hard-wired 6 foot 277 volt power cord with a L7-15p twist lock plug. Grow Amps are extremely efficient – 99.9%, soft starting, feature an extruded aluminum housing, are very quiet and lightweight.