Ref the article on red light in the cockpit. Some years ago in a simulator of an aircraft that had red lighting on the instruments, the captain complained of feeling dizzy and could not focus. We stopped the session and the next day he went to the the eye specialists.
After about a week of tests they diagnosed "red light pre-focussing" where the brain does not know whether to focus at the red end or the white end of the spectrum, and does neither. We were all told to restrict the use of red light at night, and these days it is rare to see a red light fitted in an airliner flightdeck for this reason.
For some reason, after a flight, pilots are attracted to bars with red lights and further research is needed in this area.
FWIW