GE's Daylight T8 LED tubes replace 48-inch T8—1-inch diameter—fluorescent bulbs using the existing fixture and electronic ballast. It’s slim size fits in the same fixtures as traditional 48-inch T8 fluorescent bulbs. Why make the switch to LED? GE's LED tubes are rated to last 36,000 hours. They use less energy than a 32-Watt T8 with nearly the same light output helping you save money on energy. And, they’re mercury free. Use Daylight T8 LED tubes in active spaces and commercial applications like light industrial and clean rooms to provide very cool, bluish-white light.