Download the Wola Brudnowska map too get map lighting from that map - https://ls-portal.eu/wola-brudnowska-v1-2-1/
Just drop the map into mod folder and option in AGS too pick it's lighting will appear.
Additional Game Settings - https://www.farming-simulator.com/mod.php?lang=en&country=us&mod_id=203370&title=fs2019

I won't explain how too install ReShade there are many videos on YouTube that explains it.
Once you installed ReShade put given files into your FS19 folder.

Reshade 4.9.1 Install this version
https://reshade.me/ 

Tutorial how to install ReShade - https://youtu.be/UTRc2yBMxhI

Put given files in your FS19 folder

Example: D:\Steam\steamapps\common\Farming Simulator 19\x64