What is the suitable adjustment level for low beam from 1 to 5?

[Costa]

Low beam is generally adjusted between level 1 and 2. Normally, the numbers represent the downward adjustment height of the light—the larger the number, the greater the downward adjustment. Below are the relevant details: 1. Low beam: Designed for close-range illumination, the low beam has a wide coverage (160°) but a short illumination distance, and its focus cannot be adjusted. 2. Corresponding situations: Level 1 has the least downward adjustment, followed by level 2, while level 3 has a more significant downward adjustment. Beyond its focal point (between 1x and 2x the focal distance), the low beam emits light in a diffused pattern, illuminating a larger area at close range. The illumination distance of the low beam is 30 to 40 meters, with the beam cutoff line appearing at about 12 to 18 meters.