Actual Length (in) 21.91 Actual Length (mm) 556.5 Average Rated Life (hr) 9000 Base Recessed Double Contact Bulb T12 Color Rendering Index (CRI) 60 Color Temperature/CCT (K) 4200 Diameter (in) 1.59 Diameter (mm) 40.46 Industry Standards ANSI C78.81 - 2001 Initial Lumens at 25C 1650 Mean Lumens at 25C 1337 Nominal Length (in) 24 Nominal Wattage (W) 35.00