This Sylvania CF18DD/835/ECO DULUX 18W double compact fluorescent lamp with G24D-2 2-pin base has a color temperature of 3500K. This bulb is 82 CRI, ECOLOGIC for use on magnetic ballast 2-Pin Base Compact Fluorescent Light Bulb. It has a rated life of 10000 hours and a diameter 0.50 inches.