The T5s are only 8 watts each = 24 watts. BUT, they are WAY brighter than the 36w CF that they replaced. Her's was a 2006 model with the 36W CF, and they replaced the hood. The other BIG difference is that the T5s don't heat up the water like the CFs did.

That being said, I probably wouldn't try to grow SPS under them. Remember though, these 12g nanos are really about 8 gallons.