Convert your existing fluorescent fixture to LED technology with the Feit Electric T848/840/LEDG2/10 4 ft linear tube LED lamps. This 4100 K cool white light lamp is non-dimmable, produces a similar fluorescent lamp output (1800 Lumens), uses 18 W electricity and up to 41% less energy than a standard fluorescent lamp. Get instant on to full brightness with relatively cool running performance.