Features high frequency 105 kHz microprocessing technology optimized 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. Smart Volt brand technology allows ballast operation 120 240 V. Includes a 6 foot 120 volt power cord. Purchase a 240 volt power cord separately (#903088). 277 volt ballast includes a hard-wired 6 foot 277 volt power cord with a L7-15p 277 volt twist lock plug.