"Upgrade your old fluorescent fixtures to energy-saving LED technology with the Feit Electric 12-inch diameter LED circular lamp with a 4-pin base. This fluorescent replacement produces 2000 lumens of 4100K Cool White using only 20 watts - saving up to 38% in energy costs over an equivalent 32-watt fluorescent. Our LED Circline Fluorescent Replacement series offers relatively cool running performance with an average rated service life of 25,000 hours / 22.8 years. Installation is easy: no replacement of ballast or rewiring of fixture is needed. Choose a dependable LED fluorescent replacement bulb for all your residential or commercial applications."