12-10-2009, 01:48 PM
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Going back to my post, it really depends on what the ballast is rated for. The ballasts are designed to run specific types of bulbs, this should be clearly printed on the ballast itself. If it is a T8 ballast, then only T8 bulbs should be run on it, if it is a T12 ballast, then only T12 bulbs should be run on it. I know the T12, T10, and T8 all have similar pins seem to be interchangable, but it really depends on the ballast. Since T8 bulbs run at a lower current than T12, they should really be run with a different ballast.
From my experience, running T12 bulbs in a T8 ballast would decrease the life the ballast because the T12 lamps run at a higher current. On the other hand, T8 Bulbs running on a T12 ballast would decrease the life of the bulbs because the current running through the bulbs would be higher than needed, overworking the bulb. This is just my two cents, if other people claim that they see no ill effects, then you should be fine. Just keep in mind there are no advantages to running certain types of bulbs in different types of ballasts, no added brightness or life of the bulb.