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I didn't quite set up exactly as you asked, but this should be good enough. I got started with a certain setup at 80% and I just kept going from there. If you really, really want to see a more controlled example, you need to tell me exactly where you want the light as well, because distances over which a given % amount of falloff occurs depends highly on the actual distance to begin with.

Anyway, here is 80% intensity, but not at the front. For reasons I won't explain, P8 ISF reference distance is not adjustable, and is always 1 PNU, or about 103 inches. This is behind the back wall of the wood box. The light is 50 inches from the tall white box.

It's better than good enough.  That shows exactly what I wanted to see and all I can say is WOW!

Thanks for doing the renders.

Can you say anything else about the new feature that influences low light?