The ballast compatible T8 4ft 20W LED tube as a clear tube with 6500K color temperature and a CRI of >80 can deliver lumens up to 2800. It is an excellent substitute for T8, T10 & T12 fluorescent tubes. This 20W can safely and easily replace the fluorescent tubes of 70W and bring energy-savings of 50W. Thus, a lower utility bill for you every month. This 20W can work with ballast and hence the existing fluorescent tube should be taken out and the LED tube must be put in its place. However, you must ask us for a ballast compatibility list. These 20W LED tubes are housed in rugged die-cast aluminum for efficient heat dissipation. For the standard ceiling height, these LED tubes having a beam angle of 120 degrees, emit enough bright light, have a long lifespan, and have a shatterproof coating unlike the fluorescent tubes that were of inferior light quality, typically low lifespan, and usually with no shatterproof. One of the best things about LED tubes from Ivanees is they are ETL listed.