The only way that those beams would be visible is if light was scattered from them. And, it would be blue in hue, scattered by the oxygen molecules as I recall. As every photographer should know that's why the sky is red near sunset. It might be, if the flashlight had an LED source tuned to blue, that over time, enough light would be scattered to make the beam visible. I don't think it would be with an incandescent source, but I don't have clear enough air to test it. But then, maybe I do inside my house. But then, any evidence of this would probably not be regarded as appropriate for this list. roger Sent from my iPad
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