Thanks for posting that, I did not know that the T-8s held their output better than the T-12s. It looks like dirt accumulation has alot to do with declining output too.
I think the T-8s are only 32 watts = more efficient. The older T-12s were 40watts, then dropped to 38 watts. Most of the cheaper shoplights fixtures still use the thicker T-12s unless that has changed in the last two years. (For those of you who don't know, the number represents tube diameter in 1/12 inches, I forget what the "T" stands for.)
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