In the United States, for example, the National Highway Traffic Safety Administration (NHTSA) regulates the type of headlights that can be used on vehicles. According to the NHTSA, headlights must be white or amber in color. Any other color, including purple, is not allowed.
However, some states have their own laws and regulations regarding headlights. For example, California allows vehicles to have purple headlights as long as they are not used in conjunction with white or amber headlights.
Therefore, whether or not nokya purple headlights are legal to have on a vehicle depends on the laws and regulations of the specific jurisdiction.