Mine are in a rack system with undertank heat only. If yours are in an aquarium, you can either use UTH and then cover most of the screen top with plexiglass, plastic wrap, or even a towel. This will help to hold in some of the heat to keep your cool side up a little.

Or you can dump the UTH and use a red bulb, or one of the special reptile night bulbs for heat. If you do this do not put anything else on the top as it would be a fire hazard, and can get your tank too hot. I myself would use the UTH with a thermostat or dimmer, but either of these will work.

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