... MH/HPS compatible Water proof, No fans. 1000W Dimmable Electronic Ballast.The features of the 1000W electronic ballast.100V~240V, 277V,347V,400V HPS&MH convertableNo ... fans insideDimming function is availableUL,CUL,CE,TUV,GS approvedElectrical Performance of 1000W ...