HBA-126 520mm Aluminium High Bay Housing Aluminiumreflector to provide high efficiency direct light distribution. Lamp Holder E40 porcelain lamp holder IP Rating IP20 for Open Type Wattage 250-400w Gasket Weather proof and durable silicone rubber Cable High temperature cable and high voltage pulse cable where applicable Gear Box Aluminium dia-casting gear Three models of gear boxes recommended. : GB11 , GB12 and GB16 Lamp Type1 Metal Halide, High Pressure Sodium , Mercury Application Suitable for height installation and wide area light distribution such as shopping malls , super markets , convenience stores , warehouse , storage.