Metalux, 24CGTS-L3C3, Backlit Flat Panel, Standard, Series: CGT Series, 120 to 227 VAC, 40 W Fixture, LED Lamp, 122 to 137 Lumens/W Light Output, 2 ft x 4 ft Ceiling Opening, 60000 hr Average Life, 3500/4000/5000 K Color Temperature, 80 CRI, 0 to 10 VDC Dimmable Ballast, Frosted White Lens, 3600 to 6648 Lumens, Recessed Mounting, Steel Housing Material, 47-3/4 in L x 23-3/4 in W x 2-1/8 in H Dimensions,