Red vs Green filter compass legibility comparison
Red vs Green filter compass legibility comparison
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And now we know why the military uses so much green light....
A big part of it has to do with running night vision. On aircraft what used to be red lighting is now NVIS friendly green. My limited understanding is that it is within a range of the light spectrum that can be seen by the naked eye (obviously) but prevents glare/bloom when seen through night vision.