Sylvania UltraLED™ Retrofit Door Kit, Dimmable, Specifications: 120 to 277 V, 0 to 10 V Dimming, >80 CRI, 3500 K Color Temperature, >100000 hr Average Life, 4100 Lumens, 126 Lumens/W, 47.8 in L x 23.9 in W x 2.4 in H Size, LED Lamp, 33 W Fixture, Surface Mounting, Troffer Fixture, Steel, White