What is the standard adjustment for car headlights?
2 Answers
The adjustment of car headlights usually involves the left-right and up-down alignment of the high and low beams. This can be done by using the knobs at the back of the headlight assembly with appropriate tools. The standard for left-right adjustment of car headlights is as follows: 1. The light beam of car headlights should be as concentrated as possible. Excessive dispersion can cause blurring, affecting illumination and potentially disturbing other drivers. There are two adjustment screws at the back of the headlight assembly—one for height and one for width—which can be turned to adjust the left-right and up-down alignment. If the light beam is not concentrated, left-right adjustment is necessary. 2. Park the car 10 meters away from a wall, measure the distances from the low beam to the central axis, the high beam to the central axis, and the low beam to the ground. Then move close to the wall and mark these measurements on the wall. Observe whether the light beam is offset left or right or too high or low. If the focal point of the headlight does not align with the marked point, it indicates misalignment. Adjust the width knob to align the focal point with the mark on the wall. 3. Generally, the width of the light beam is preset at the factory and is not recommended for self-adjustment. If there is misalignment, minor adjustments can be made. During adjustment, the right headlight beam can be slightly tilted to the right to improve visibility of the right-side road in low-visibility conditions like rain or fog. However, it is more advisable to have the adjustment done professionally at a 4S shop or repair shop.
I often drive long distances, and I remember one time at night when the headlights from an oncoming car were blinding, and I almost had a collision. Since then, I've learned to adjust my headlight height myself. The standard adjustment mainly prevents glare. Find a level parking spot with a vertical wall, park the car 5 to 6 meters away from the wall, and turn on the low beams. The center of the beam should be slightly lower than the height of the headlights, usually around 60 cm above the ground. The light spot shouldn't be too scattered or too high to avoid dazzling other drivers. Using simple tools like a cross-head screwdriver, locate the adjustment knob at the rear of the headlight and turn it counterclockwise to raise the beam. Safety first—proper adjustment makes nighttime driving clearer, reduces accident risks, and avoids police fines. Every time I change a bulb, I check the adjustment. It only takes a few minutes and is really practical.
