I am having trouble figuring out a lighting debug. I have a mesh in the center of the map which you can see is showing up as red with the lighting debug shader. This mesh only has three lights hitting it.

http://i.imgur.com/pzl4qOc.png

But you can see in the bottom right corner of the screenshot that I have a mesh with FIVE lights hitting it and it is only showing as purple/red. I know that's pushing the limit too, but the problem is, that red mesh is causing a rendering artifact that changes based on player camera angle as shown in the next two screenshots.

http://i.imgur.com/BKCdOoS.jpg

http://i.imgur.com/E1IyTJE.jpg

I am not getting this artifacting anywhere else in the level and I have already gone as far as I want to go in "compromising my artistic integrity" with the lighting design on the space. Is there some other way to approach this problem other than reducing the light count?