Question about AP flexwatt.

If you only have one enclosure I'd suggest that a commercial UTH (like an ultratherm) might be a simpler solution flexwatt can be a big pain to deal with. It sags if mounted to the enclosure it does better placing the enclosure on it. I use flexwatt but I don't love it.

Thats what I wanted to get, but I remember in another thread someone saying that it wouldn' be able to heat a t8?

I have 11 inch flexwatt and a zoo med UTH they are about the same heat unregulated the ultratherms don't get seriously hot they hit about 100ºF the enclosures I have hold 90º and the UTh runs at 93-4 so IMO the commercial stuff would be fine. The ultratherm is a touch questionable but most of the others will be fine.

I suspect the ultratherm would be too but I can't say for 100% certainty.