Headlight aim has a big effect on headlight performance. A change of only 0.1 degrees vertical aim has visible consequences. A car in movement obviously has variations in headlight aim, and in the future we will have real time, dynamic automatic aiming of high accuracy. But it won't come cheap. https:/
...Good lighting requires a good headlamp, well aimed. This investigation [by Audi lighting engineers] looks at the effect on headlight aim of individual tolerance contributors from car body parameters like load, tire pressure, suspension as well as temperature parameters of chassis and plastic parts.... DVN : What technology of automatic aiming could solve the tolerance problem? Michael Hamm: In this case a possible correct answer would be rocket science. No jokeâ€”in missiles there are precise 3D positioning devices; we should think on something similar adopted in automotive. A kind of triple gyroscopic determination of the headlamp coÃ¶rdinate system, the car coordinate system, and the street coÃ¶rdinate system. Then we would have perfect aim everytime and everywhere. DVN: OK, but that would surely take a long time to perfect In the meantime? M.H.: We must continue in small steps. Improve awareness, improve aiming. We should try to increase automatic levelling to reduce glare and increase ADB systems penetration because they are less influenced by vertical aiming deviations. Wherever possible, decrease tolerances and improve sensor ability. A very big milestone would be any kind of closed loop between the aiming and the resulting light distribution on the street. This is an important task, also for future digital projections on the road.