600-watt dimmable digital electronic ballast accept input 110-240-volt(ac). dimmable level 50-percent, 75-percent and 100-percent * 1 x 600-watt super hps bulb and 1 mh bulb * 6-inch standard air cooled hood * Pair of Rope Ratchet * 24-hour timer * 1600-watt super hps bulb and 1 mh bulb