I have installed http://skyrim.nexusmods.com/mods/7654 and it's an awesome mod, no FPS hit, brighter and more lively colors in outdoors, problem is night are too dark and interior cells are too dark as well, now granted I made myself a little mod alternative to candlelight to make things better http://skyrim.nexusmods.com/mods/27743/; I really dislike the almost pitch black vision I get into interiors, with normal brightness in-game, that's how I see in Winterhold College at midday:

http://img827.imageshack.us/img827/5716/55680144.jpg

The only way I found so far to improve the visibility is to shoot the brightness to the roof by in-game controls, but if I do that exteriors are f**ked up and it feels like being in Africa:

http://imageshack.us/a/img823/3776/29323654.jpg

I also tried installing http://skyrim.nexusmods.com/mods/13049 but it has NO EFFECT AT ALL even after fiddling with the controls as detailed in http://skyrim.nexusmods.com/mods/11422

I am a little lost, considered there are several "realistic lighting config" and none of them seem to be doing what I want, which is basically clearer interiors (dark is okay, bare visibility as in my first screenshot is not) and leave the exteriors the way they are which is all right.

Can anyone direct me to the right solution?

The "Vanilla with customisation" version doesn't make it that much darker really. What version are you running?