It's been a long time but IIRC that set up uses a large IDL emitter box and a reflector (soft box) in a void. I imagine you would want to increase or decrease the ambient values on the emitter box and fiddle with IDL intensity in the Render Firefly dialogue. I believe that the default intensity for that would be around 65. The set up includes a rim light. Very nice soft shadows and articulation of forms there.

As I said it's been a very long time since I've read that or used the lighting set up there but it's a fascinating and very informative thread, you should read through the whole thing...

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