What Causes Yellowing on the Surface of Car Headlights?

[MirandaLee]

Car headlight surfaces turn yellow due to prolonged exposure to air, high temperatures, UV radiation, and oxidation, which cause the headlight covers to age, resulting in yellowing and cracking. Here are some maintenance tips for car headlights: 1. Replacement: Ensure that car headlights maintain good sealing, especially to prevent contamination or damage to the reflector coating. When replacing bulbs or diffuser glass, avoid touching the lens with your fingers to prevent leaving sweat or oil marks, which can dull the reflector and reduce its efficiency. 2. Regular Inspection: Periodically check and adjust the headlight beams to ensure the illumination distance meets requirements and that the high and low beams are aligned correctly. The diffuser glass should be installed properly as per specifications to prevent loosening or misalignment and to maintain the vertical orientation of the prisms.