Oooooohhhh, i see now.
From my understanding of light tracer, it's not meant for detailed renderings like close ups of wood (Granted, I realize this isnt exactly a CLOSE UP, but in the land of photometric lighting, it is). It's meant more so for lighiting, oh saaaaay, the civic center in some Califronia center (to those that caught that,

). I think they'd more so encourage something like photometric lights with a radiosity solution for something like this. However, being deadline's coming up, I dont know if that would be the wisest thing to do...You might just want to leave light tracing out of THIS scene. Just do it on the scenes wehre it works. That'll give you the technical edge while even though consistancy throughout the animation wont be the same.
If you can, try some photometric lighting (Its in create>lighting>photometric) and try creating a radiosity solution, maybe even for simply that scene. Lemme know what happens, and if ya wanna, my AIM S/N is specialagentjim, we can see if we can figure it out step by step. Talk to ya later. good luck!
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AIM S/N: Specialagentjim