... ,277V.347V,400V 250W,320W, 400W,500W, 600W,800W,1000W CE,TUV,UL,CUL,GS approved No fans HID electronic ballast ... ,250WVoltage: 100V~240V,277V, 347V,400V.HPS&MH convertableUL,CUL, CE,GS,TUV approvedNo fan,no resin insideDimming function is option ... free operation.· Input voltage: 100V~277V, 400V· HPS/MH compatible Approval: CE, GS, TUV, UL.CUL Customized integrated grow light soluaitons are ...