Sylvania 21878 FBA_FBO31/835 21878-FBO31/835-31 Watt T8 U-Bent Fluorescent Light Bulb, 3500K Length: 22.6"; Leg Spacing: 1 5/8" Average Life: 20,000 Hours Initial Lumens: 2725 CRI: 82 T8 Tube Diameter (1")