PLus, the ambient light triggers photoperiod cycles in beardies that regulate behavior, stimulate appetite, etc. If you watch a cold beardie, they turn darker (darker colors absorb heat), and spread out like a pancake to increase their surface area. They are designed to utilize overhead heat and a heat rock just doesn't do much for them.

Overhead heat via light will do so much better, along with a good UV source. The overhead heat will also heat up the substrate to provide some heat from underneath as well.

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