Click the arrow to move it to the list on the right.
Once the mod is active, use the standard lighting controls to see the effect:
: You can find it on the Steam Workshop or download the .zip archive from external modding sites.
: Designed to work with all standard SCS trucks included in the base game.
: Move the downloaded .scs or .zip file to your ETS2 mod directory, typically found at: Documents \ Euro Truck Simulator 2 \ mod Activate in Mod Manager : Open Euro Truck Simulator 2 and select your profile.