DetailsThe 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. 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.