everything you have just pointed out has already been answered. All the problems you came up with for why not to breed iguanas are problems that affect breeding most species of reptiles. They just really aren't that big of an issue. There are many more problems that arise by supporting the wild-caught iggy trade, and even the people that breed them in their native lands. Breeding isn't done because people don't understand how to do it. All this has already been pointed out.

Also, you mentioned that early (EARLY) iggy keepers had iguanas fail to live before the invention or the 'uvb bulb'. Did they bother to try anything else? There are so many other aspects of husbandry that are still missing to this day. This is for most reptiles (if not all) in general.

If you want to look at tests, there's plenty of tests on UV bulbs. The ones I look at you would never find on a manufacturers website though. The ones that indicate how low the amount of UV flourescent tubes produce is (low enough that you might as well use a regular flourescent), and the literature that suggests that mercury vapor bulbs can be harmful.

I don't think UV bulbs are necessarily a bad idea, just poorly executed and not necessary.

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