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. Feit Electric shatter-proof lamps have an average life of 35,000 hrs/32 years are RoHS compliant and are 100% mercury-free. Choose a dependable flicker-free lighting for residential or commercial applications. No replacement of the ballast or installation of LED driver or removal of old ballast required.T8 and T12 plug and play replacementInstant full brightnessShatter-resistant coatingNo flicker or strobing, non-dimmable