I just bought a triple tube all glass strip light which says it is for T8 lights, but I could only find T10's at my LFS. The T10's work fine in it, but it is a tight fit. Is there any danger to using T10's in a T8 fixture? Or is the only difference the diameter of the bulbs?
Edit: I just answered my question the T stands for tubular and the number stands for the diameter of the lamp in eights of an inch. http://energyretrofitters.com/lampballast.html
explains it in a little more detail. As far as i can tell there's no harm in what I'm doing, but if anyone knows otherwise please let me know.