THE EFFECT OF RED AND WHITE INSTRUMENT LIGHTING ON THE DARK ADAPTATION INDEX-Ⅱ

摘要

When the markings on an instrument panel are illuminated by white and then by red light to levels giving equal legibility, it is found that there is some loss of night vision by white light. The loss of night vision corresponds to the level of dark adaptation which is attained after 18 minutes of darkness instead of 22 minutes. It is therefore, in practical terms, of little importance to most types of night flying.nSince the different operational roles need varying degrees of night vision, and also since individuals have special preferences, it is suggested that the experimental findings justify the following recommendations:that all aircraft instruments be illuminated by white light under variable control, and that flood lighting should be either white or red according to preference, and again under variable control. Red flood lighting, however, would be recommended where maximal night vision was required.