Can someone please explain why light shining through a window does not illuminate a room with IDL regardless of the number of raytrace or IDL bounces? If I have an Infiinite light at 100% intensity representing the sun shining through three windows at a 36° angle above the horizon, why is the room still so dark? The floor where the light initially strikes is lit properly, but the light doesn't seem to bounce and illuminate the room adequately. (The image attached above)

I'm seeing this occur in other renders as well. The light doesn't appear to behave correctly or realistically. This render by carodan seems to have the same problem.