This file will change how X-Plane looks at night at a very realistic way, without any noticeable performance penalty. Changes the default X-Plane file, so should work with any addons. For better experience, remove anything that alters X-Plane lighting.
Go to X-Plane 11/Resources/bitmaps/world/lites folder and backup the lights.txt file.
Put in place the lights.txt from the archive you've downloaded.
Enjoy flying at night!
If you have any problems, replace with the one you have backed up.
In a future update, X-Plane might override this file. Keep the archive safe in a place to put it back.