stupid question

Wattage usaully. The t-12 ballast are generally rated for something like 28w t-8s are rates for 32w and I believe a 48" t-5 or good for 50w or close, so the answer would be, no, not the same. You will probably ruin the ballast or the lamp or both.
 
Something that i thought was wow, nice to know (prob. will sound lame to others) is that the T-rating is how many 1/8ths of an inch the bulb is.
 
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