Save Money On The Costs Of Energy With This Energy-Efficient, 20-Watt Bulb. A Unique Capsule On The Inside Provides Instant Light That'S Rated At 2,700 Kelvin. As The Bulb Warms To Its Full Brightness, The Halogen Capsule Turns Off To Use 75 Percent Less Energy Than Regular Incandescent Bulbs. A21 Bulb With An E26 Base Provides Up To 8,800 Hours Of Light. Compact Fluorescent Bulb Is Rated With A Cri Of 82 And Provides 1,100 Initial Lumens..