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Originally Posted by SteamWake
"Rigged for red" was only used when the ship was preparing to surface after dark. It was done to allow the sailors pupils open and have better night vision. Under 'normal' conditions surfaced, submerged, day / night normal 'white' lighting was used. No they did not spend all night under red lighting. Some guys may have turned the lights down / off while sleeping.
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Can you find support for this, because I'm dubious. My understanding is it can take 30 minutes or more to fully acclimate your night vision, and in wartime steaming why take the chance on having to wait 30 minutes if some need to look around at night suddenly comes up (potential target or emergency). If you were
sure you wouldn't need night vision on short notice I could see this, but what captain could be that sure?
Certainly on surface I'd question any sub running with normal lights inside. We always set night time lighting on surface ship, and a WWII sub was nothing much more than a small surface ship that could submerge part of the time. Sub isn't big enough to isolate your watch reliefs to allow night vision to fully acclimate, easier to darken ship.
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Originally Posted by SteamWake
I remember reading somewhere that modern subs alter lighting levels to simulate day / night cycle for moral purposes. See as how the boys literally havent seen the sun for months.
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Again, my brief (overnight on USS Gurnard) at sea experience on a modern US Navy sub confirms this is done, and part of the reason is to keep some sort of reference fram on real world.