There is no way to affect the lighting inside as such though certain backdrops also include map wide effects. The "Barge of the Dead" map (not the proper name, can't recall that but shows in the description--the one with the boat) has a kind of eerie fog.
Wasn't there a way to build outside a of a space station map? In the dark section.
Yes, BUT, it uses the same lighting style as if you were inside.
I managed to make my underground map in Darkness between the Stars that way by adding dark particle effects, but my trick for making the walls dark was to choose a backdrop with lighting that clashed with the color of the walls. IE, I used a backdrop that had primarily green lighting(TRD..something) in a map that didn't reflect that color. The TRD backdrop isn't particularly dark, it's about mid-range, but the way it interacted with the purple cave walls made the walls look almost black. I tossed in some black-ish particle effects to add a bit more gloom.