ILO is an immersion mod for Fallout 3 and New Vegas

ILO modifies all interior cells giving them a realistic / somewhat natural look. This mod aims to increase the immersion and creepiness of the fallout world, especially inside the vaults, caves and buildings. Lighting values are adjusted as well as the addition of lighting fixtures to the appropriate places where they were left out.

ILO on Nexus[www.nexusmods.com]
ILO-FNV on Vault108 (Sarge198's Website)[www.vault108.com]
ILO-FO3 on Vault108 (Sarge198's Website)[www.vault108.com]