the "Max Headlights" entry in the player.json should enable you to limit the amount of cars that cast light onto the track and environment. This entry works untill you go below 10. Anything below 10 gets discarded and no matter how low you go, 10 cars will cast light onto the track. example: 20 cars, "Max Headlights":20 in player.json, 20 cars with headlights on track | good 20 cars, "Max Headlights":10 in player.json, 10 cars with headlights on track | good 20 cars, "Max Headlights":5 in player.json, 10 cars with headlights on track | bad 20 cars, "Max Headlights":2 in player.json, 10 cars with headlights on track | bad This seems to be with at least the GT3 content, LMP3 content and the Clio's.