... 240V, 277V, 347V,400V UL,CUL, CE,,TUV, GS OEM&ODM are available. greenhouse lighting ballast Welthink WEX120 and WEX230 series Horticultural ... of the Welthink series HPS/MH electronic ballast for Horticultural Lighting.Power range:1000W,600W,400W,250WVoltage: 100V~240V, 277V, ... OEM&ODM, customized lightings are available UL,CUL,CE,GS listed, 100V~240V, 277V,347V,400V greenhouse lighting ballast