Since you are using lamps, its a bit debatable. I would personally put the probe on top of the substrate on the hot side (you can call it a basking spot, but they don't really bask). Then you will set the thermostat at 90-94 to get your hot-spot temp. This is the most important temp because it helps them to properly digest their food. While the others are also important, they can be more forgiving.









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