@mayankdixit
The problem of fogging is one that headlight designers have grappled with for years. A compounding factor is that headlights are becoming increasingly larger and therefore contain more interior air. This air heats up while the car is being driven – due to the warmth of the lamps and the heat from the engine. Almost all modern headlights have a ventilation system that prevents a build-up of pressure by displacing this hot air, and this system is carefully designed to allow no direct ingress of water into the headlight housing. However, in line with normal physical laws, air from outside is sucked back into the headlight interior when the inside air cools down again. If this outside air is humid, due to the prevailing weather conditions, condensation forms on the inside of the cover lens.
Fogging disappears of its own accord after the headlights are switched on. Designers seek to accelerate this demisting process by diverting the residual heat from lamps or control gear through the headlight housing. Despite all these efforts, not enough dry air is able to reach the farthest corners of the housing, and this is where condensation persists the longest. How long it actually takes until the lens is completely clear depends on the current weather conditions and level of humidity. When a vehicle is stationary, it takes even longer – and warmer weather – before the condensation finally disappears.
In many cases, daytime running lights have made the fogging situation even worse. Typically using LED light sources, daytime running lights generate far less heat than the low beam function – and they’re frequently installed as a separate unit. When trying to prevent fogging, it therefore makes sense to drive with your low beam headlights on instead of your daytime running lights, as more drivers tend to do in the fall and winter seasons anyway.
Source:
carlightblog
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Check headlight vents whether they are blocked, as this can lead to persistent moisture and fogging issues. Insects, road debris and spider webs can block vents. You can also spray compressed air through the vents in order to clear the vents.
However, I wouldn't advice repacking the headlight if it was never removed before. Like VISHNUCARCRAZY and Suryaputhra said, resealing properly is more important otherwise fogging issue will be become worst then before.
I have upgraded to Mini projectors I am extremely satisfied, half a KM throw and no condensation in my lamps due very tight seal.
One of my friend also got it from Aliexpress in the beginning of this year and we both installed the same in his Maruti Swift. I wanted to post product review but kept on postponing.
Here are the some of product and after installation photos.
![[:)]](https://www.theautomotiveindia.com/forums/images/smilies/Smile.gif "Smile [:)]")
