... 2.T5-4x14W,T5-4X54W T8-4x32W 4 foot industrial High Bay fluorescent light fixturesSpecificationHousing 0.6 or 0 ... lampholder and prewiredInstallation surface mounting or suspending with S hook.Options high frequency electronic ballast,VS,Osram,Fulham,Tridonic ... usually found in stores, warehouses, schools or any other industrial buildings with high ceilingsHighBay lights offer reduction of energy cost ...