HPS/MH Dimming Ballasts 1)Voltage:100-268VAC 2)Input frequency: ... >0.99 4)400W/600W/1000W 400W/600W/1000W HPS/MH Dimming / Dimmable Electronic Ballasts ROSH,FCC, CE, TUV certification ... noiseless5) Fast start-up, reach full brightness quickly6) Operate HPS & MH lamps.7) Available in 220-240V and 110-120V, 150W ... rapid install and excellent energy saving. 400/600/1000W HPS/MH Dimming Electronic Ballasts