Modder raidenfrank has released a new mod for Fallout 4, aiming to overhaul the lights and shadows. This mod, titled Fallout4 Dynamic Lights and Shadows Overhaul, removes some orginal fake light sources, add more dynamic lights that cast more realistic dynamic shadows, resulting in more natural and realistic visuals.
Source: N4G PC Fallout 4 mod adds dynamic lights that cast realistic dynamic shadows in exterior places