What is the reason for the standard reference values of car headlight height adjustment?

[KeiraAnn]

H1 height up to 62.5 mm, H3 not exceeding 42 mm, H4 not exceeding 92 mm, etc. More details are as follows: No adjustment needed: Vehicle lighting regulations usually apply to the left and right of the low beam, while the high beam generally does not require adjustment. The adjustment can be made via the knob at the rear of the headlight assembly, allowing owners to adjust the lights themselves with tools. Self-adjustment of headlights is not allowed: Generally, self-adjustment of headlights is not permitted. According to relevant automotive safety standards, headlights are adjusted to the optimal irradiation range and height before leaving the factory. It is generally recommended to have professionals or use professional equipment for adjustments. Individuals should not attempt adjustments lightly, as this may lead to unforeseen consequences, ultimately requiring the vehicle to be sent back to a 4S shop for repairs.