I've been playing with "The Lighting Mod" and it does improve the game a lot I think. But, before I go and try to edit everything myself and make my own mod, I was wondering if anyone knew about a mod that's out there that handles ambient lighting in a more extreme way? I am wanting to make all interiors and the exterior space at night have the same ambient lighting values that The Lighting Mod gives to caves and ruins so that the only actual light source are real light sources, and everything else is pitch dark. I'd really hate to have to go into every cell in the CS and do that if someone else has already done it before, or if there is some other way to go about it.

I use PirateLord's http://www.pirates.retreat.btinternet.co.uk/light.htm, which basically does what you ask for.