... ,600W,1000W 100~240V, 277V, 347V,400V UL,CUL, CE,,TUV, GS OEM&ODM are available. greenhouse lighting ballast Welthink WEX120 and ... ,400W,250WVoltage: 100V~240V, 277V, 347V, 400V.HPS&MH convertableCE,GS,TUV,UL,CUL approvedNo fans insideDimming function is option.Dimming ... &MH compatible OEM&ODM, customized lightings are available UL,CUL,CE,GS listed, 100V~240V, 277V,347V,400V greenhouse lighting ballast