Haven’t seen in real life but nearly all movies show switching to red light under stealth mode (of course also during emergency mode). Shouldn;t red light be visible from a long distance ?
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One the surface: red light doesn’t carry as far as while light does, so low-powered red lights are used at night for illumination when keeping things dark is of paramount importance (keep in mind things are generally lit just enough to keep you from tripping over stuff). It also has the benefit of not affecting your night vision as much as white light does, as well.
Undergound/underwater/in enclosed spaces: red lights are used sometimes in these conditions to allow screens and instrument panels to be as visible as possible without glare from white lights on the screen. It’s easier on the eyes when looking at the screens and panels.
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