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Originally Posted by JREX53
Rig for Red implies that the lights with red lenses are lit so that your eyes will become accustomed to the darkness, thus allowing you to see things at night better.
The control room and the berthing compartments are usually the only areas that are rigged for red.
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That and, the ammount of light given off by red lenses, is 1/5 of what white light is. (Immagine a 60 watt light bulb verses a "nite-lite")
From a distance of 3000 yards, you could easily see a sub by the light shinning up throught the conning tower. With red lenses, it is possible, if the conditions were just right, for subs to sneek right up to within 1000 yards without being seen or detected.