... electronic ballast.Welthink series digital electronic ballast can run HPS and MH bulbs both automatically under 100V~240V, 277V, 347V, ... : UL,CUL, EMC, ROSH,CE,TUV.Suitable Bulbs400W, 600W, 1000W HPS/MH bulb of America and Europe standard Electrical Performance of ... grow light soluaitons are available UL CUL CE TUV listed HPS/MH electronic ballast,250W,320W,400W,500W 600W, 800W,1000W ...