At what distance should high beams be switched to low beams?

[DelDavid]

High beams should be switched to low beams when an oncoming vehicle is between 150 to 200 meters away. Relevant details are as follows: High beams: The intensity of the light is adjusted based on the distance of the filament. High beams focus the light parallel, emitting a concentrated and bright beam that can illuminate distant and high objects. Low beams, on the other hand, are positioned beyond the focal point (between 1x and 2x the focal distance), emitting a divergent light that covers a wider area at closer range. Difference between high and low beams: Both are used for nighttime illumination, but high beams have a higher angle and longer range, while low beams have a lower angle and shorter range.