Hydrofarm's Phantom Digital Ballast arrives on the market as the most rigorously tested ballast in the industry. The Phantom features silent operation, lightweight design, multiple placement options and the maximum lumen output around. Resin potted ballast does not require a cooling fan. Dual resettable breakers - protects lamp and household circuits. Internal RF protection and generator ready. 5-year manufactures warranty. We recommend Ushio HiLux and Sunmaster grow lamps for use on Digital Electronic ballasts