Equipped with energy-saving ballasts, Die-formed channels, Heavy-duty, apertured or closed-top reflector, Pressure-lock lampholders (RS), spring loaded lampholders (SL, HO), Deep-draw, full-width reflector ribs add rigidity, Baked white enamel finish, Apertured reflector standard with 6% uplight, Porlux and silver-lined finishes, Also available in tandem 8' lengths