GE, F5BX/827/ECO, 5W, Warm White, T4, 2 Pin, Biax Ecolux Compact Fluorescent Light Bulb, 5W Equivalent To 20W Incandescent, G23 Plug In Base, 4.25" MOL, 10,000 Rated Life, 2700 Kelvin Color Temperature, 265 Lumens, TCLP Compliant.This 5 watt compact fluorescent bulb has a G23 2-pin base, is equivalent to 20 watts. a warm white light output and a 10,000-Hour rated life. The overall length is 4.25".Brightness 265 LumensEstimated Yearly Energy Cost: $0.60 based upon 3 hrs/day. 11c/kWh. Cost depends on rates and use.Life: 9.13 years based upon 3 hrs/dayLight appearance: 2700KEnergy Used: 5 wattsContains Mercury: For more on clean up and safe disposal visit:epa.gov/cfl