uv question

So I got a red iguana about a week ago, got everything he needs including his UV bulb, most places say he needs 12 hours of this but he's usually in his hide for 4 of those hours is this ok?

Yep. He would spend those hours in the wild hiding as well. For an iguana, use a good, strong UVB bulb, the kind sold for desert species. They have high UVB requirements.

He may be hiding becaus ehe is stressed or improper housing. Make sure everything is perfect and I promise he'll start basking more.