I know my friend has an iguana that has never had a UV light. It thrives living in his finished basement. Basking in the windows of his house. It is over 4 feet long not sure of its age. I am sure some herps need UV lighting depending on there situation. If kevin has been using them for couple years now and his herps are thriving with no ill effects. There is some evidence it works for his herps.
thanks mike and cheryl