Bill, what would you suggest as a wattage? I've never tried a UTH with my planted vertical enclosures.
the two people I know who set their geckos up in the way you suggested had arid substrate, turning me off that method.
perhaps they were not misting adequately?
(thanks for correcting me; I don't always hit a homer)
I'm not sure I can give you a 'wattage'. I have almost 250 glass enclosures on Metro wire rack shelves for Tokay. I started using the pet store sticky-back heat pads. Most of the original 50 pads peeled off within a year. I have heat cord, heat tape and other heat pads under the enclosures now.
The trick is to have a good layer of substrate of several inches. I use Cyprus on top of an inch of Hydro-balls, expanded clay balls. The other trick is to adjust the UTH thermostat to balance the drying effect. Too cold, and you have a swamp in the rainy season. Too hot, like in the dry season, and you have the desert kindle you've seen.
So right now I'm misting 4 times a day with a heavy soaking for one of them. It's the rainy/breeding season. The rooms are a bit cooler, (high 80's day/mid 70'2 night), than summer months but I have the under heat up a bit to off-set the monsoon.
For folks with a single enclosure in a typical house, the under heat is the saving grace for keeping the Tropical enclosure up to temps.
Come summer, the misting will fall off to 2 short mistings a day and the ambient temps will be in the high 90's down to the high 80's, but I'll dial back, or turn off the under heat depending how I'm misting them.
I find if I can almost dry out the substrate daily it will last all baby season. 7 months.