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Forum Thread
Celestron Night Vision Red LED Flashlight $4
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The red doesn't ruin our night vision; A regular flashlight would cause our eyes to need time to adapt back to the dark environment while the red light doesn't cause that problem.
It's like walking into a dark room from a bright room, everything will look dark for a bit while your eyes adjust. If your "bright" room only had a red light and you walked into a dark room, your eyes would adapt much more quickly.
You should not compare these to regular flashlights like that you tube video did.