No, red headlamps help the wearer too. Red light triggers less of an adaptation [1] response than other hues relative to the amount of useful illumination they

No, red headlamps help the wearer too. Red light triggers less of an adaptation [1] response than other hues relative to the amount of useful illumination they provide. Red light lets us perceive our surroundings, but doesn't trigger our eyes to close the pupils and become less sensitive to the incoming light. (Blue has the opposite effect, which is why a room lit only by blue light can feel both dim [hard to see] and harsh [unpleasantly bright] at the same time.) [1]: https://en.wikipedia.org/wiki/Adaptation_(eye) https://en.wikipedia.org/wiki/Adaptation_(eye)