In article , Jose wrote:

I don't know whether it counts for the alleged problems, but there is
a nontrivial difference betweem laser light and the diode in your
headband.

Yes, the nontrivial differences are that my headband is around a thousand
times closer and puts out a hundred times as much energy.
We're not talking about a precision instrument here. How big a circle would
be illuminated at 5000 feet? If it spreads even 0.01 degree it's over a foot
in diameter. 5 mW spread over a couple square feet? I'm extremely
skeptical of this. Extremely.

Mike Beede