What is the difference between aftermarket lights and OEM lights?

[LeLondyn]

The difference between aftermarket lights and OEM lights lies in quality and price. Aftermarket headlights are more affordable, but their housings tend to lose sealing performance over time and show more noticeable aging. In contrast, OEM headlight housings maintain their sealing performance for many years and exhibit minimal aging. Here are some ways to distinguish between OEM and aftermarket headlights: 1. Inspect the edges and joints of the headlight for imperfections. Aftermarket headlights often have inconsistent quality, and the engraved characters on them may appear blurry. 2. Check the gaps between the installed headlight and the car body. Aftermarket headlights may have uneven gaps or significant left-right misalignment due to inferior manufacturing standards and poor tolerance control, whereas OEM headlights fit more precisely. 3. Aftermarket headlights may have poorer light projection, slower response times, and even uneven brightness between the left and right lights.