Thermostat probe sounds good, just make sure you put a probe right on the glass above the UTH, under the substrate. Set your thermostat at whatever temp it needs to be to get the thermometer to read about 90*.
I would also have another thermometer on the cool end of the tank to measure the ambient temperature. If you keep your house at or above 75*f then you probably don't need a light. If you keep it colder, you could get a low wattage red bulb and use it with a dimmer to only heat the tank a little bit.
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