This 1000 watt Galaxy DE operates on 277 volt power and features high frequency 105 khz microprocessing technology for running double ended lamps. This Galaxy DE Select-A-Watt ballast can operate a 1000 watt lamp at 600, 750, 875, 1000 watts and Turbo Charge. This ballast will properly drive 600, 750 and 1000 watt lamps. Set the desired wattage on the Select-A-Watt dial and install the correct lamp. Very quiet operation and limited vibration. It has a thermally optimized non-fan cooled aluminum housing. Galaxy DE ballast comes pre-wired with a dual universal lamp cord receptacle that is compatible with all Sun System brand reflectors as well as other branded reflectors. Includes a hard-wired 6 foot 277 volt power cord with a L7-15p 277 volt twist lock plug.