Ulti-lumenx GLSET400CRHM 400-Watt Light Digital Dimmable System for Plants - Air Cooled Hood Set 400-watt dimmable digital electronic ballast accept input 110-240-volt(ac). dimmable level 50-percent, 75-percent and 100-percent 1 x 400-watt super hps bulb and 1 mh bulb 6-inch standard air cooled hood Pair of Rope Ratchet