What does 1.0% mean for headlights?

[LaMatthew]

1.0% represents the tilt amplitude value, meaning the headlight beam tilts downward by 1 meter every 100 meters. Introduction to car headlights: Also known as car front lights or LED daytime running lights, they serve as the "eyes" of a car. They not only relate to the owner's external image but are also crucial for safe driving at night or in adverse weather conditions. Usage of car headlights: Car headlights come in two forms: high beam and low beam. Use low beam on urban roads with streetlights, and switch to high beam when driving on roads without streetlights or on highways. When meeting another vehicle, turn off the high beam and switch to low beam.