T8 4 feet LED glass tubes to render a total of 1700 lumens, with a color temperature of 4000 kelvins. Thanks to its size and frosted coating, it is also quite an energy-efficient lighting fixture compared to the standard T8, T10 or T12 fluorescent tubes. These lights are good for lighting large areas, as they have a beam angle of 220 degrees. One can avail warranty of 3 years on this product while the total life of these lights is already 30, 000 hours. The 18 watt light renders a total of 1700 lumens and is 80% more energy efficient than the equivalent old fluorescent lights.