http://www.nexusmods.com/fallout3/mods/18753/?
It is an awesome ENB for FO3 but unfortunately due to the weather plugin at certain times of the day it goes very dark. I had a go at fixing it but I didn't have much success, I found this thread (http://taleoftwowastelands.com/content/fellout-20-coversion-blackout-noon) on the issue for Fellout though so hopefully that helps anyone who has a go.
Thanks!