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The headlight is an essential device to ensure the safety of motor vehicles at night and improve driving speed.
The vehicle is subject to vibration during the driving process, which may cause the installation position of the headlight to move wrongly, thus changing the correct direction of light beam irradiation. The insufficient luminous intensity or headlights aimed too low reduces the driver’s sight distance when driving the driver can not see ahead of the situation. But if the headlights are aimed too high, the oncoming driver caused be dazzling, which may cause night traffic accidents.
Therefore, in order to ensure the safety of night driving, the position of the headlight beam irradiation is listed as a mandatory safety inspection project.
You might need to fix your headlight alignment if:
- You replaced your headlights assembly
- You have upgraded your OEM to LED headlight bulbs
- Your vehicle was in a collision
- You’ll be carrying more weight than usual
How high should headlights be aimed?
According to the test and data check from AUXITO, the headlight beam irradiation position can achieve the standard lighting and not dazzle the oncoming car if it can meet the following requirements.
1. Motor vehicles (except transport tractors) in the test headlights low beam irradiation position, headlights at 25 feet from the screen, the height of the midpoint of the beam should be 2-4 inches downward offset from the headlight’s reference center height, its horizontal position to the left and right offset shall not exceed 100mm.
Headlight Aiming Wall Chart
You can also refer to the rules specified in SAE J599, if your car’s headlight height is less than 36in, you can directly take the horizontal height of the headlight as the base without offsetting down a distance.
2. If the vehicle is a dual-beam light with high beam and low beam, the low beam light is the mainly adjusted. Adjusting your low beams will also reset your high beams to where they should be, as most cars don’t have a separate adjustment for the high beams. But for lamps that only can adjust the single beam with high beam light, adjust it directly.
3. You can always check the owner’s manual of your model or Lighting Inspection Code for low beam cut-off height adjustment to get the standard lighting.
Test your alignment on the road
After all the steps are completed, you can drive your car on the road to ensure that the beam of the headlights is appropriate. If necessary, repeat the above steps until it is suitable.