Is it generally the low beam or high beam that gets modified when upgrading headlights?

[DelRuth]

When upgrading headlights, it is generally the low beam that gets modified. The requirements for lighting are as follows: Low beam irradiation position requirements: When the headlights are projected onto a screen 10 meters away, the horizontal position of the low beam should deviate left by ≤170mm and right by ≤350mm. However, this is only a recommended maintenance item, not a disqualifying one. Even if the vehicle does not meet this standard, the overall evaluation on the report will still be qualified. Light intensity requirements: For four-lamp vehicles, achieving 12,000 CD is sufficient for qualification, while two-lamp vehicles need to reach 15,000 CD.