... compatible , 120V/240Vconvertable UL,CUL, CE,TUV, listed No fans inside The features of the Welthink series Grow light ballast,digital ballast.Run ... .Soft startingDimming function is option.Approval: UL,CUL, EMC, ROSH,CE,TUV. Suitable Bulbs250W, 400W, 600W, 1000W HPS/MH bulb of America ... : 24.60 in(97mm) H: 34 in (135mm) UL,CUL, CE,TUV, listed 120-240V,1000W,600W,400W, digital ballast