Since asymmetric light distribution appeared on the market in 1957, there have also been statutory provisions for headlamp adjustment.
Headlamps were first aimed at the so-called "10-meter wall". That means a vehicle is driven to a distance of 10 m in front of a light-coloured wall which has certain markings on it. The headlamps are then checked or adjusted on the basis of these markings.
This has remained the statutory test method until today. It is still used particularly for checking agricultural or special vehicles. One of the disadvantages of this method is that a relatively large, light-coloured and free wall needs a corresponding amount of space. Both were, and are, not exactly often present in workshops.
These circumstances were also ultimately among the factors responsible for the development of beamsetters. Such devices enable quicker and more flexible checking of light distribution.
The following describes the measuring methods, the legal basis, and the most important stages involved in professional headlamp adjustment.