I would not use the light bulbs. The uth should be enough.

I've got my hold-back female from this year in a 20 long until
she's big enough for a 4 foot Vision.

I use an UTH and what I do is tape cellophane wrapping to the
screen to block off about 80% when she goes into shed to raise
the humidity. My temps are good but I'm in Miami the temps here
are easy to deal with.

Good luck. You may need more heat depending on the ambient temps
of the room your using. (Too cool is better than too hot)...tc

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