UPDATE: See the final version on page 2 of this thread
Decided to re-render "Window" with real radiosity instead of the old version's manually-placed lighting.
One light, sixteen passes, six hours:
The only light leak I wasn't able to address was that bit under the lip of the table . . . I chalk it up to it being geometry that was modeled six years ago. Otherwise, I'm impressed. Working GI in A:M. Ain't that some chit?
Thanks to Yves P. for his radiosity primer.