Why did one of the xenon headlights suddenly turn yellow?

[McJesse]

Xenon headlights suddenly turning yellow is due to lower color temperature. Here is relevant information about car lights: 1. Headlights: Combined headlights are located at the front of the vehicle, primarily serving illumination and signaling purposes. The light emitted by headlights illuminates the road conditions ahead, enabling drivers to drive safely at night. Combined headlights can be categorized by light source into halogen tungsten lamps and xenon lamps. 2. Taillights: Combined taillights are located at the rear of the vehicle, mainly serving illumination and signaling purposes. Taillights generally consist of rear position lights, reverse lights, brake lights, rear fog lights, rear turn signals, and retroreflectors.