How to Distinguish Between Low Beam and High Beam?

[DelLola]

The difference between low beam and high beam headlights lies in the adjustment of light intensity based on the distance of the filament: the high beam is focused, emitting light that travels in parallel, is more concentrated, and brighter, capable of illuminating distant and high objects; the low beam is positioned beyond the focus (between 1x and 2x the focal length), emitting light in a divergent state, which can illuminate a larger area of nearby objects. When driving in dark areas without streetlights, during dusk when it's dim, or at dawn, it is necessary to turn on the low beam. In cases of heavy fog, snow, or heavy rain that obstruct visibility, the low beam must also be turned on even during the day. On some roads with insufficient lighting despite having illumination equipment, the low beam should also be used. Under normal circumstances, when driving on urban roads, the low beam is sufficient because urban areas generally have good lighting conditions. Using high beams can easily dazzle oncoming vehicles and cause accidents. On highways or in rural areas without streetlights, high beams can be used to expand the field of vision.