Home Depot sells a double stick tape that sort of looks like a thin white foam. It is very sticky and strong. I think if you buy the $12, 36" single fluorescent fixture you could cover the back of the fixture with this tape and then stick it to the glass of the back wall.

Using the pythagorean theorem you should mount it so the bulb is about 17.5 to 18" above the substrate that way it will be no more than 20" from the front bottom corner of the tank. For 20" penetration you would go with the Zoo Med Reptisun 10.0. Then you could cut a notch in the screen to get the cord to the outside of the tank. If you buy one of those lights you'll also need a power cord. I'd just buy a 3 prong extension cord of the appropriate length and cut off the female end.

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