The NextGen 600/400 Electronic Ballast will run up your choice of 400 watt or 600 watt bulbs. 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. The NextGens are the smallest ballasts available and weigh just 4.25 lbs for the 600w/400w ballast. They can run at any voltage from 90v - 260v, making them very versatile. The Universal Lamp Receptacle will accommodate most manufacturers' reflector cords. In addition to these great features, the NextGen Electronic Ballasts can run your bulbs up to an amazing 65' away from the ballast. The NextGen Electronic Ballasts come with an awesome 5 year warranty. (3 years full, 2 years pro-rated)