... . CE & UL Dimmable Digital Ballast 1000W for HPS/MHOne ballast can run 3 different wattage bulbsKey Word: Electronic Ballast, Dimmable Electronic Ballast, Grow Light Ballast 400W, Hydroponic grow ballast 400w, electronic ballast 400w, 110V, UL Listed1 ... power 4) Light weight, small size, non-flickering, noiseless 5) Fast start-up, reach full brightness quickly 6) Operate HPS & MH lamps. 7 ...