Use_Skybox_Ambience option in Preferences.json gives more light in the night which affects to gameplay on my server where night supposed to be absolutely dark (if you dont have flashlight or nvg). And as far as I know this option does not represented in in-game options.
This is comparison of enabled and disabled Use_Skybox_Ambience
Default settings ("Use_Skybox_Ambience": false)
Default with gamma boosting (doesn`t really help)
Tweaked settings ("Use_Skybox_Ambience": true)
Tweaked with gamma boosting (bright as day)
