The nextgen family of electronic/digital ballast will run up to a 1000 bulb. With flicker-free operation, fast lamp ignition and a constant lamp voltage, they are perfect for the next generation of gardening.They produce up to 30% more light than a standard core and coil ballast, while putting out much less heat. They can run any voltage from 90v - 260v. The universal lamp recepticle will accommodate most manufacturers reflector cords. These ballast have a 5yr warranty. (3yr full, 2yr pro-rated. newitem168464050 400W Nextgen Electronic Ballast newitem168464258$188.95 600W Nextgen Electronic Ballast newitem168464313$248.95 600W/400W Nextgen Electronic Ballast newitem168464358$258.95 1000W Nextgen Electronic Ballast newitem168464406$398.95 Quantum 1000w Adjustable Digital BallastAdjustable from 1000W-500W using 1 1000w lamp. 1 Ballast for every lighting need. newitem3203641848$395.95