Ulti-Lumenx GLK600CRHM 600 Watt Grow Light Digital Dimmable HPS MH System for Plants Air Cool Hood Set 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 6-inch standard air cooled hood Pair of Rope Ratchet