Red light is used to prevent night vision loss and to reduce the chance of being spotted.
But you may ask yourself, why red light, why not say Blue or Green. Well the simple fact is that red light is at the bottom of the visable light spectrum just befor it become infrared. Now infrared as every 1 knows is a light we cant see, we can feel it tho (called heat), but we cant see it. So if your using a visable light source thats damn close to a light source we cant see, what do you think happens. Our pupils expand of course to gather as much of this nearly none visable light into the retina so as our feeble brains can process it.
Blue light believe it or not is actualy the closest colour light to white light, so its of course no good, Green follows not to far behind.
Also of interest, when a match stick is struck onto the box and the immediate flaring that you get - thats visable on a good clear night to 1 mile. Now you can see why the red light's are always so dull, to even further reduce the Night vision loss and detection.
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