This is the current ProfitUI Nightvision, just put that in an ingame macro and you are good to go:
/r_flat_ambient true
/r_min_dir_ambient_intensity 0.8
To go back to "normal" vision ProfitUI currently uses this:
/r_flat_ambient false
/r_min_dir_ambient_intensity 0.3
There you go, you now have nightvision without any mods.