This 1000 watt Galaxy DE operates on 277 volt power and utilizes 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 watts and Turbo Charge. Set the desired wattage on the 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 6 foot 120 volt power cord.