> there are no headlights that meet DOT requirements that are purple or yellow. FMVSS 108 doesn't directly define a permissible color for headlamps. It referen

> there are no headlights that meet DOT requirements that are purple or yellow. FMVSS 108 doesn't directly define a permissible color for headlamps. It references some SAE documents that define it, but you have to pay money in order to access them. Headlamps can have a range of permissible color output (e.g., halogen vs HID vs LED), and, apparently, bulb manufacturers like Sylvania manufacture halogen bulbs with a blue filter that apparently complies with FMVSS 108 even though they have a bluish color.