Ulti-Lumenx GLSETX600DHWING Digital Dimmable HPS Grow Light System for Plants with Wing Set, 600-Watt 600-Watt dimmable digital electronic ballast accept input 110-240-volt(ac); dimmable level 50-Percent, 75-Percent and 100-Percent 1 By 600-watt super HPS bulb 19-Inch wing reflector Pair of rope ratchet Ballast also work with any 600W MH Bulb (Not include in this SET)