I'm not sure how your nights aren't dark enough.
For me, on Xbox, it's more than dark enough at night, to the extent that I require a torch/headlight on, and really benefit from a night-vision scope.
And you can see glowing fungus and other light sources from a massive distance anyway.
My only issue with lighting in the game, is the fact that the hanging lightbulb is the ONLY buildable light source that produces anywhere near a decent amount of light.
The industrial ones that sit on the walls are decent, but not as bright.
And the lamps and things, particularly the quite wide selection you can earn through magazine, are just atrociously bad. They light up about a foot around their bulb, and that's it.