Also is there a better night vision mod? The stock nightvision in Skyrim is laughably bad nearly useless.
Gopher has a nightvision mod but you will need SKSE. If you are using an ENB it might not work.
http://www.nexusmods.com/skyrim/mods/22274/?
As for darken up caves I have not found one that I liked at all. I found that Vanilla did a better job overall. I found the lighting mods might have done a better job in a cave or two and then in other places it was just totally off
Lighting mods would do it, Realistic Lighting Overhaul is modular so you could use the Interiors or dungeons(?) module only, its not configurable though