... ,1000W CE,TUV,UL,CUL,GS approved No fans HID electronic ballast 250W,320W, 400W,500W, 600W,800W,1000W.Welthink ... WEX120 and WEX230 series HID electronic ballast are specially designed for horticultural lighting in greenhouse. Lamp ... function is optional. The features of the Welthink series HID electronic ballast.Power range:1000W,600W,400W,250WVoltage: 100V~240V,277V ...