The Galaxy® Grow Amp® 600 Watt ballast can operate a 600 watt lamp at 400 watts & Turbo Charge® a 600 watt lamp. These ballasts will properly drive 400 Watt HPS/MH, & 600 watt HPS lamps or properly drive 400 Watt HPS/MH, 600 watt HPS & 1000 watt HPS/MH lamps. Set the desired wattage on the Select-A-Watt® dial & install the correct lamp. Galaxy® Grow Amp® ballasts come pre-wired with a Sun System® lamp cord receptacle. They are compatible with all Sun System® branded reflectors. Includes a 6 foot 120 volt power cord.