... TUV listed No fans inside HPS/MH electronic ballast.Welthink series digital electronic ballast can run HPS and MH bulbs both automatically under ... etc. The features of the Welthink series HPS/MH electronic ballast.Run for HPS and MH lamps both.High power factorPF≥0.98Low ... UL,CUL, EMC, ROSH,CE,TUV.Suitable Bulbs400W, 600W, 1000W HPS/MH bulb of America and Europe standard Electrical Performance of 400W ...