What is the appropriate color temperature for headlights?

[ClaraAnn]

The color temperature of headlights should be between 3500K and 5000K, with 4300K being the optimal choice for illumination effectiveness. Excessively high color temperatures tend to emit a bluish hue, and even higher temperatures may produce a purple tint, which significantly reduces visibility in hazy weather conditions. This can impair a driver's ability to clearly see the road ahead, while simultaneously dazzling oncoming drivers or pedestrians, thereby increasing the risk of traffic accidents. Color temperature serves as a standard metric for evaluating the spectral quality of a light source, defined in relation to an ideal black body radiator. When the visible radiation spectrum of a light source perfectly matches that of an absolute black body, the temperature of the black body at that point corresponds to the color temperature of the light source.