>>28577740
Those indium-gallium-nitride LEDs naturally produce eye-searing blue light that's like halfway to ultraviolet. The eye's ability to focus depends on the wavelength to some degree; that particular blue is out of range for many eyes and requires quite a bit of effort from the rest.
In white LED lights, it's turned into a more neutral color by slapping phosphor material on the diode to absorb some of the retina rape waves and emit something more neutral. The phosphorescent material presumably costs something and may reduce efficiency a bit.
High-end white LEDs with a nice warm color and a fairly even spectral output do exist, but I guess those have to use a mix of phosphors that cost even more and thus are not used by cheap chinashit manufacturers. So you get these "white" LED lights with a mix of comfy spread-spectrum light and a nasty blue spike in one end.
There are standards that limit that blue spike at least for computer monitors, but I don't know if anything similar exists for car headlights.
