Kenjamin1 MI submitted a new map: Terror Station - H5 - Infection - dark and scary, keep runnin' Read more about this map...
If you use the gloom effect, it increases darkness significantly. Maybe something to look into. I use it for my Nightmare maps (single player linear easy puzzle maps) https://www.forgehub.com/maps/our-nightmare-5.6891/ That's a link to Nightmare 5. Just to use as a reference for what I do.
@munk07 - I did try some of the filter settings and decided on none. Having it almost fully enclosed, with this skybox, keeps it dark enough. *I did a quick test with the 'gloom' effect, It goes way dark! Too dark maybe.
Well at least you tried. Everyone has their opinions and design choices. It probably would have been WAY too dark especially for infection anyways lol.