H.E. Williams Low-Profile Wrap, Series: 18 Series, 120 to 277 VAC, T5/T8 Fluorescent Lamp, 32 W Lamp, 4 Lamps, 86.3 Lumens/W Light Output, Electronic Ballast, Clear Acrylic Prismatic Diffuser Lens, Surface/Suspended Mounting, 20 ga Die Formed Cold Rolled Steel Housing Material, White Polyester Powder Coated Housing Finish, 4 ft L x 16-3/4 in W x 3-1/16 in H Dimensions,