Hardly. You can try reducing his "GlowScale" or "AmbientGlow" below 1 (I don'T know how it is called exactly anymore, because I tried these things a few times but they never worked for me in similar situations as yours). They are practically the only thigns with "Glow" in the name in the "Display" section of the thing's properties.
What I did with some ice-stalagtites/stalagmites was to take their texture into a colormodifier and simply darken it.
To do that, open the texturebrowser, create a new texture in the creation select "colormodifier". Then open the colormodifier's properties and assign the texture you used for the bunker to it (if there are more than one, you need more color modifiers) and then darken it down.
Then go to the bunker, open its properties, go to Display and change the "Skin" for the colormodifier.
Not an optimal way of solving it, but if you only need it for a few objects you can do it.