I have been keeping desert iguanas for a few years and they appear to be thriving here. I keep them with chucks and in setups similar to chucks. My basking temp gradient is higher than Melissa Kaplan suggests. Ambient mid 90s to mid 80s, basking ranges from 90 to 120F. That is the best variation that I can get in the enclosure sizes that I have and they bask at various temps, including the hottest.