I'm at work so I don't have a reference render, but I'll try to explain my problem and see if anyone can help me.

The scene I'm working on right now takes place in a narrow corridor, which is completely enclosed.  My camera is inside the corridor, looking down the hall.  As I normally do for interior scenes, I planned to light it by adding bulb lights at intervals down the hall near the ceiling.  However, whenever I add more than one bulb, the wall at the end of the corridor gets lit a lot more than the rest of the walls, causing it to appear much "brighter" and out of place.  Can anyone think of what's doing this?  I'm not using any global illumination, there's no other light source (except default ambient light), the back wall is part of the same object as the other walls and uses the same texture map, and the shininess/reflection settings are set at zero.