Seen prove that wrong, why is it the healthiest and most colorful, largest iguanas never see sunlight or UV bulbs? I guess I should specify those that are kept by people who know what they are doing with reptiles.

Iguanas need UV bulbs in captivity as much as any other reptile, in fact I remember a study done with chuckwallas, they used groups with sunlight, without sunlight and with UV bulbs, without sunlight or any light, all had the same temperatures except those that had sunlight were exposed to more natural temps (sometimes cooler) as this is a byproduct of a screen top cage, all fed the same amounts, some given extra supplementation, some not.

Throughout this study, blood tests were taken over a few years time every month. The lowest calcium D3 levels were in those exposed to sunlight during cooler days when their metabolism was effected. There was no difference from UV exposure at all. Heat and food was what mattered to them, not UV.

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