... ,110V/240V dual voltage MH/HPS compatible UL,CUL,CE,TUV listed No fans inside HPS/MH electronic ballast.Welthink series ... startingDimming function is option.Approval: UL,CUL, EMC, ROSH,CE,TUV.Suitable Bulbs400W, 600W, 1000W HPS/MH bulb of America and ... ) Customized integrated grow light soluaitons are available UL CUL CE TUV listed HPS/MH electronic ballast