Autumn and winter are here, and so is the lamp replacement season, which brings with it problems for car enthusiasts. Many car owners who have had their lamps replaced will pay special attention to their car lamps, as they are always afraid of water getting in and damaging the lamps... And many car owners are really worried about it. I discovered the problem: I woke up and walked around my car in the morning. Wow, why are the headlights fogging up? Could it be that they are not sealed? If not, I will go to Brother Qian. I promised that no water will get in. I promised "Yi Deng was born for you"... Today Brother Qian is here to explain this issue in detail to eliminate the doubts in the minds of car friends.
Let’s first talk about the principle of headlight fogging.
The reason why there is water mist in the headlight is because the water vapor in the headlight condenses in the form of film and water droplets on the surface of the mask that is lower than its saturation temperature. That is, the water vapor encounters the lampshade under certain conditions and condenses on its surface. The result of gas-liquid transformation. The saturated concentration of moisture in the air is closely related to the temperature. When the temperature is high, the air can hold more moisture; when the temperature is low, the air can only hold less moisture, so the excess moisture will condense on the surface of the object. In the car lamp, after the lamp is lit, the air temperature around the lamp increases. The temperature inside the lamp decreases from the center of the lamp to each side wall inside the lamp (including the reflector and lampshade), with the lowest temperature near the inner surface of the lampshade. . When the lamp contains a high concentration of water vapor, the air on the side close to the lampshade has the smallest capacity to hold moisture. Moisture will precipitate from the air and condense on the inner wall of the lampshade, resulting in fogging; similarly, when the car lights are turned off, If the car lamp is exposed to the sun, the moisture contained in the internal materials of the lamp will evaporate, and the air humidity in the lamp will increase. When the moisture reaches saturation, fog will form on the inner surface of the lampshade. The schematic diagram is as follows

So how to judge whether the headlights are filled with water or foggy? Let’s take a look with Brother Qian.
There is a difference between headlight fogging and water damage. Water intrusion is internal water accumulation caused by poor sealing and cannot be eliminated, while fogging is a physical phenomenon that can be eliminated. After the fog inside the car lights appears, it will take 1~1.5h to completely eliminate the fog when the lights are on; in the static state, the fog inside the car lights can be automatically eliminated after being stored in a dry environment with humidity

These two are the more obvious ones. Water beads have condensed on the lampshade and dripped down.

This picture is more vivid (O(∩_∩)O haha~)
Next, we will mainly look at the problem of lamp fogging encountered by riders.

The fogging position of this car is at the turn signal, far away from the headlights.

The fogging position of this car is also at the auxiliary light position which is far away from the headlights.

This lamp is also


These are all unmodified cars, but they still produce water mist. Look at the Mercedes Benz, it’s misting.
Don’t worry, the manufacturer has thought of it and will explain it to riders.


There is an explanation on the car's trip computer

Many vehicle owner's manuals will also explain this.

The 4S store will also provide explanations


Of course, you will also encounter it after upgrading LED headlights
Next, I will share with you some tips on defogging.
1. Remove the dust cover of the lamp so that the water vapor in the lamp can be quickly discharged.
2. Keep turning on the light for 30 minutes to accelerate the vaporization of internal water droplets through the temperature inside the lantern (the engine is running at idle speed)
3. If the fog cannot be completely eliminated, it is necessary to extend the power-on time of the lamp.
4. Use an air spray gun to blow air into the lamp to increase the air circulation in the lamp, which can speed up the dehumidification and defogging speed (the air spray gun must use an air source that has been treated for water removal)
Note: When cleaning the vehicle, do not use a water gun to flush the headlight vent position. After the treatment is completed, reinstall the light dust cover back to the light.


How about it, friends, do you have any ideas? Keep following Brother Qian, there will be more exciting content about car lights waiting for you!

Due to low temperatures in winter, the sun rises relatively late, making it difficult to see the road ahead clearly without headlights when driving in the morning. It can be seen that car lights are very important and can illuminate the road ahead for us. With the development of science and technology, there are more and more types of car headlights, including not only halogen headlights and xenon headlights, but also advanced LED headlights and laser headlights. But sometimes our headlights suddenly fog up while driving. What is the cause of this? How should we solve the problem of headlight fogging? Next, the editor will give you the answer.

There are a lot of foggy weather in winter, especially in the morning, so the headlights need to be turned on to illuminate the road ahead. But sometimes the headlights fog up, so what causes the headlights to fog up? First of all, it is because of the temperature difference. Everyone knows that the temperature difference between morning and evening is large in winter.
When the temperature difference between the inside and outside of the headlight shade is too large, water molecules in the air will gather in places with lower temperatures, causing fog to form on the surface of the shade. If the car headlights fog up due to temperature differences, we don’t have to worry at all. The fog inside the car headlights will dissipate on its own with the heat. But never bake it against the headlights, as this will cause great damage to the headlights.

Secondly, when the vehicle wades into water, it will also cause the car headlights to fog up. When we drive on a rainy day, the car will inevitably wade into water, and water vapor will enter the inside of the headlights along the ventilation pipe. At this time, we can open the back cover of the car headlight assembly and then turn on the engine. The fog inside the headlight will evaporate quickly.

Many people like to use a high-pressure water gun to clean the engine when washing their cars, and they directly cover the engine compartment without cleaning the water. At this time, the water vapor in the engine compartment will enter the headlights, causing the headlights to fog up. Therefore, we try not to use a high-pressure gun to flush the engine when cleaning the car. We can buy some desiccant and put it inside the headlights to absorb excess water vapor to prevent the headlights from fogging.

In addition to the problem of fogging headlights when we usually drive, we also encounter the problem of yellowing car headlights. So what causes car headlights to turn yellow? The reason why car headlights turn yellow is because the car is exposed to the sun for a long time, and the plastic headlight shades will turn yellow under long-term exposure to ultraviolet light. Also, headlights will turn yellow after being used for a long time. So what should you do if your car headlights turn yellow?

Many car owners will go directly to the 4S store to replace the headlights after discovering that their car headlights are yellow, but this is too expensive. In fact, we can use soapy water to clean the yellowed areas of the headlights and dry them after cleaning. Then polish and wax, and the headlights will become as bright as before.

When we use car headlights, we should pay more attention to the maintenance of car headlights. Try to park the car in a cool place and avoid prolonged exposure to the sun. And regularly check and clean the headlights to extend the life of the car headlights.
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Today Da Haohao will show you how to renovate car headlights in Pakistan. It happened that my friend heard that headlights could be repaired in Pakistan, so he drove his Toyota to a small shop that specialized in headlight repairs. We all know that after being used for a long time, car headlights will become yellow and blurry after exposure to wind, sun, rain, and the light transmittance cannot reach the brightness of normal use. Basically, in China, the problem can be solved by directly replacing the headlight assembly.
But in Pakistan, the lampshade can be renovated and repaired, because it needs to be renovated as a whole, so the lampshade needs to be disassembled. In Pakistan, there is a shortage of materials. If there is no hot air gun, the master will use a gas blowtorch to heat around the lamp shell to soften the internal sealant. However, the temperature of the flame gun is not easy to control, so the master did not dare to heat it for too long and separate the lamp body and lampshade with his bare hands.

·After the lamp body is disassembled, the master will then remove the fixed frame from the lampshade to facilitate subsequent work.
·After the disassembly is completed, the master will first use soapy water to clean the entire lampshade. Because soapy water is alkaline water, it will not damage the lampshade and can also remove the yellowing oxide layer inside the lampshade. I really didn’t expect that Master Batie was actually a master of physics. Rinse once with soapy water and then rinse again with clean water to remove any foam on the surface.

·After cleaning is completed, the master will wipe the inside of the lamp housing clean with a rag.
·After wiping clean, you can assemble the lamp body and lampshade back together. Before installation, it is also necessary to use a gas blowtorch to soften the surroundings, and then the lampshade can be buckled back.

·After the lampshade is installed, use tools to install the fixing screws around the lampshade back to achieve the best sealing effect to prevent water intrusion during later use.
·After the headlight assembly is completed, the problem of yellowing on the surface of the lampshade can be solved. The master first uses sandpaper and water to polish. Because the gap between water and sandpaper is smaller, the grinding debris is also smaller, so there will be no serious scratches during polishing, so the polishing effect is more ideal.

·After polishing, in order to increase the gloss and brightness of the lampshade, use a polishing machine to polish it to increase its original transmittance.
After the polishing is completed, the problem of yellowing of the headlights is considered to be repaired.
What do you think of Master Batie’s craftsmanship? Please leave a message in the comment area. Thank you.

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