RAB Indoor Troffer, Backlit, Series: T17, 120/277 VAC, 0.33 A, LED Lamp, 40 W Lamp, 112.9 Lumens/W Light Output, 50000 hr Average Life, Neutral White Light, 4000 K Color Temperature, 80 CRI, 10% 0 to 10 V Standard Down Dimming Ballast, Frosted Polystyrene Lens, 4472 Lumens, Ceiling Mounting, Galvanized Steel/Plastic Housing Material, 2 ft H x 4 ft W x 2.78 in D Dimensions