... compatible UL,CUL,CE,TUV listed No fans inside HPS/MH electronic ballast.Welthink series digital electronic ballast can run HPS ... and MH bulbs both automatically under 100V~240V, 277V, 347V, 400V.They ... ,CUL, EMC, ROSH,CE,TUV.Suitable Bulbs400W, 600W, 1000W HPS/MH bulb of America and Europe standard Electrical Performance of 400W ...