Where are the files for day/night/twilight?

[Hitman]

I'm looking for the files that control how much light is rendered depending on the hour of the day. In many games those are graphic files with a colour gradient going from white (Day) through orange (Dusk/Dawn) to night (Black or dark blue), are they in the "EnvAtlantic.dat" and such, in the "Env" folder? Or is there any other file that controls how much light is rendered in the 3D world depending on the hour of the day?

I'm interested in tweaking the dusk/dawn ambient light to reduce it heavily, for the purpose of reducing the vampire vision bug (If I can't have the crew spot well during twilight, I might alternatively make twilight be as dark as night so their spotting range is correct for the visibility :hmm: ).

Thanks for any help