Nice info I am sure users would like to read it! Thanks!
that is funny you posted it cuz I spend all day on this theme regarding light and all the stuff.. i love my nerdy stuff on Sunday!! lol

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I was testing today some things based on the real light and shadows , got even ambient occlusion colored, what i mean here is that the color surface of the model change the colors to darker in place to have the ugly grey AO shadows what set this everything in a total new light.. the most funny thing about  that the model surface ( diffuse color) was set to almost black but still everything was working as it works in nature.. the light controled the surfaces, no hard sharp textures was needed as only light diffuse colors, the bump maps, hdri and ao handle everything with amazing reality... i am still working on this article and as soon as I am done i will post online, it set the poser a little bit up-side-down but very interesting..

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"Surrender to what it is - Let go of what was - Have faith in what will be "