This Galaxy? Select-A-Watt? ballast can operate a 1000 watt lamp at 600, 750, 1000 watts and Turbo Charge?. This ballast will properly drive 600, 750 & 1000 watt lamps. Set the desired wattage on the Select-A-Watt? dial and install the correct lamp. 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 (#903082). The Legacy? ballast runs on 120-240 volt power. This ballasts has an extruded aluminum housing that is very lightweight. It features soft starting and fan cooling. The Legacy? ballast is extremely efficient at 99.9%. This state-of-the-art ballast is manufactured to provide today?s serious grower with maximum flexibility & performance.