I noticed this as well. The shaders on the PS3 aren't exactly perfect- I believe it's because the PS3 uses OpenGL, and the Unreal engine hasn't built proper support for everything in OpenGL yet. Or at least, that's my guess.
If this is the case, there's probably no way to fix it, aside from patching Unreal. Apparently Ninja Theory has created their own modified version, so if they had a 3D engineer they may be able to do it through an update. Fortunately, most of the best scenes in the game don't have the kind of light where this would show up.
Although I love the PS3 for various reasons, this is one really good reason to get the PC version, to get the best visual experience. Of course, the colors and texture quality on the PS3 seem to be better than the XBOX 360 version from the comparison shots I've seen.