Red, green and blue are in reality the only three true colors that the eye can see. That is because your eyes have sensors for each of these three colors. Therefore, using red light might "saturate" your red sensors, but leaves your green and blue sensors still sensitive, and hence you still retain your "night vision"... whell, at least that was more or less the idea, but modern science has discovered that it is actualy better to use green light in low light situations (what color are the modern night vision cameras?)
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