Columbia Lighting tradeSELECT® Edge-Lit Flat Panel, Recessed Architectural, 120 to 277 V, 31/40/50 W Fixture, LED Lamp, 122/125/128 Lumens/W Light Output, 54000 hr Average Life, 4000 K Color Temperature, 80 CRI, Acrylic/Frosted Lens, 3400/4100/5500 Lumens, Ceiling Mounting, Extruded Aluminum Housing Material, Matte White Housing Finish, 47.7 in L x 23.7 in W x 1.68 in H Dimensions