In spring and autumn, the temperature difference between day and night is large. If there is continuous rainy weather, a layer of water mist will appear on the inner surface of the vehicle's front combination light lens (commonly known as the mask) during car washing, and in severe cases, water flow will occur (as follows) As shown in the figure), this is the so-called headlight fogging/sag phenomenon. If the temperature is below 0℃ (or even lower than -20℃), the water mist layer will condense into ice crystals.
This is because the interior of the vehicle's front combination headlight is a relatively sealed and small space. When the low beam and low beam are working, the temperature inside the light is very high. In order to meet the heat dissipation requirements when the front combination light is working, the lamp housing part of the front combination light is There will be heat dissipation holes to form convection heat dissipation with the surrounding air. The greater the temperature difference, the stronger the air convection. During the air convection process, the water vapor contained in the air inevitably enters the inside of the lamp, causing fog, frost and water vapor around the edges, corners and other parts of the lamp. This phenomenon is similar to what we often encounter. The fogging of the front windshield is the same as the fogging of the glass at home, and it is a normal physical phenomenon.
So how can we quickly eliminate the fog in the front combination lights? The following methods are recommended to everyone:
1. General treatment method: When the engine is idling, turn on the high/low beam of the front combination lamp, increase the temperature inside the lamp to accelerate the vaporization of small water droplets inside, and observe the dissipation of fog in the lens of the front combination lamp every 10 minutes, usually within 60 minutes. Can be completely dissipated.
2. Quick dissipation method (applicable to Binrui halogen lamps): If it is difficult to dissipate the fog in the headlights and your vehicle uses halogen lamps, you can open the back cover of the front combination lamp and use a hair dryer (cold air) to The water vapor in the lamp blows away
Precautions to prevent front combination lights from fogging:
1) Frequent use of front combination lights can effectively alleviate vehicle fogging
2) Modify the lamps carefully. Accidental impact may easily affect the air-tight structure of the headlights and cause water leakage.
