... can run HPS and MH bulbs both automatically under 100V~240V,277V,347V 400VThey have been widely used in hydroponics, horticulture, greenhouse ... .Approval: UL,CUL, EMC, ROSH,CE,TUV.Suitable Bulbs400W, 600W, 1000W HPS/MH bulb of America and Europe standard Electrical Performance of 400W ... ) H: 34 in (135mm) UL,CUL,CE,TUV,approved hydroponic grow lights ballast