I've got two 75 watt iridescent light bulbs going in a dual dome sitting on the screen top. One stays on all the time, the other is on a timer I've rigged to act like a thermostat until I get one. I've foil covered 90% of the screen top with holes for air flow. I've got a 55 gallon. Temps on hot spot are at 87-88 and cool side is 83-85. I don't have a UTH yet because he got burnt when our old one melted. I'm excited to get a herpstat soon. I also covered the back and two sides and one underside with blue foam board from lowes. We don't heat our house that high so we had to get creative.

Im thinking of making a plexiglass top to go ontop of the screen soon.