I've switched my T12's over to T8's, No question T8's are a stronger output with less heat, A total plus!
Unless your growing catts, Dens, multi's bloomers, some of that nature, then you should be fine with lower lighting levels.
You can always add clamp on CFL's down the road if you feel you don't have enough light. Great source for strong spot lighting.
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Gloria
"If you don't ask, you'll never learn"
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