Step One:

To add lighting, you need to download the "Additional Game Settings" mod: https://www.farming-simulator.com/mod.php?mod_id=308552&title=fs2025
and place it in the mods folder in: Documents\My Games\FarmingSimulator2025\mods

Step Two:

The next step is to go to the Farming Simulator 25 folder on Steam, located at:
C:\Program Files (x86)\Steam\steamapps\common\Farming Simulator 25
and paste the "data" and "x64" folders there.
In-game, open your saved game and go to the additional settings. Look for the "custom lighting" option and change it to mapeUS "RIVERBEND SPRINGS." And reload it by entering any machine in the shop and then exiting.

P.S. I'm giving you a few mods for the game that improve the machine physics.