Some quick notes on area lighting, fog and weather. This is going to be made into a better page later.
Lighting in NWN has become a bit more nuanced in NWN:EE. There is a better lighting engine as of 2020 and this improves the tile and dynamic lighting and how it interacts with things.
Concepts:
Day and Night Lighting
Sun and Moon
Skybox
Fog
Dynamic Lights
Currently you cannot control the Sun/Moon Ambient/Diffuse options.