Why make the switch to LED?
They provide long 16-year life based on six hours use per day, so you'll replace less often. 48" T8/T12, 40 W, T8 Tube, Bright White, PK6 GE's T8 LED tubes replace 48-inch T8—1-inch diameter—fluorescent bulbs using the existing fixture and electronic ballast.. GE's LED tubes are rated to last 36,000 hours.