Is It Normal for New Car Headlights to Fog Up?

[MacValentina]

New car headlights fogging up is normal. Here are the extended details: Reasons: Due to temperature changes inside the headlight, once humid air enters, it becomes difficult to escape, causing moisture to accumulate inside. This is especially noticeable when the headlights haven't been used for a long time. When the car is driven, particularly during nighttime with frequent headlight usage, the residual heat from the headlights will warm the air inside the headlight housing, evaporating the moisture and accelerating its removal. Principle of Headlight Fogging: In all current vehicle models, whether equipped with halogen, xenon, or the more technologically advanced LED headlights, there is a rubber vent tube behind these lights. When the headlights are turned on instantly or during normal driving, the generated heat is expelled through this tube. However, the presence of this tube also allows moisture from the air to 'seize the opportunity' to enter the headlight interior. Over time, this moisture forms fog and accumulates into small water droplets.