GE, F13BX/841/ECO, 13W, CFL Plug In Biax 2 Pin Compact Fluorescent Replacement Bulb, GX23 Base, Nominal Length = 7", 10,000 Hours, 825 Lumens, 4,100 Kelvin Color Temperature, CRI=82, Minimum Start Temperature = 32 Degrees Fahrenheit, TCLP Compliant, Energy Star Rated, Boxed.