LED28ET5GHO-4-3CC-1T. It is a 28 watt, glass T5 shape with a mini bi-pin base. It is equivalent to a 54 watt linear fluorescent. The bulb provides 3800 lumens. The bulb allows use to select from 3 color temperatures: 3000 (warm white), 4000 (cool white), or 5000 (daylight) Kelvins. With a CRI: 80 and an MOL: 45.75". The bulb is not dimmable with a rated life of 50000 hours. Can be used in enclosed fixtures.