In all, it's something to experiment with.  IDL is a render setting, so, when you're rendering a scene with IBL, why not select it, and see what results you get?  This was rendered with IDL, and IBL Based light (Blackhearted & Synthetic's Pro Studio - Dutch Masters).  I know it's not a whole scene, but it's not an outdoor scene ;)

Oh, and if you have questions about the Environment prop, go ahead and ask.  I'm sure there are enough people who use it that can answer your question ;)

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