It's funny that you posted this today. I was just reminded yesterday that I had promised to post a sample scene showing how to light an outdoor setup with IDL. You're doing it.

This is just the sort of activity I love to get sucked into. Unfortunately, I have a big out-of-town meeting all day tomorrow so won't be around much to participate until tommorow night.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)