Powermaxx GLSET400CT6 400-Watt Digital Dimmable HPS MH Grow Light System for Plants with Cooled Tube Set 1- 400 Watt Dimmable Electronic Fan Cooling Ballast; Acceptable input: 110v - 240v. Dimmable Option: 50%, 75%,100%, and 110% 1- 400-watt super hps bulb and 1 mh bulb 1- Cool Tube: 23" x 6" Duct Size: 6" Made of Glass and German Aluminum 1- Pair of Rope Hanger : Weight Capacity - 150 lbs per pair w/ Improved Metal Internal Gears; One Click at a Time 1 - 24 Hour Timer Controller