What is the best way to solve the scattering of car headlights?

[DiRonan]

First, park the car 7.6 meters away from the wall and turn on the headlights. Next, adjust the beam position based on the light pattern on the wall. Some car models have an integrated headlight height adjustment knob inside the vehicle. Then, measure the following three distances below the car headlight position in advance; Distance A is the distance from the center of the low beam to the central axis of the car. Set these reference lines on the wall to facilitate adjusting the headlight focus. Before adjusting, project the headlights onto the wall and observe whether the beam is misaligned, too high, or too low.