More examples would be good. I've seen this page [Ambient Occlusion](http://www-viz.tamu.edu/students/bmoyer/617/ambocc). To me it looks similar to what the ProbeLight node does, but I could be mistaken. ([The Probelight node](http://www.keindesign.de/stefan/poser/probelight.html) and [An Efficient Representation for Irradiance Environment Maps](http://graphics.stanford.edu/papers/envmap)) Single overhead spotlight, left half normal, right half with ProbeLight nodes plugged into Alternate_Diffuse.