What type of wattage and lense assembly from a handheld laser is needed for this in a remote heavily forested mountain area, if your friend is 5 or so miles away, that he can easily see with the naked eye? My survival 2.2w blue 445nm with a g2 lens could easily be seen at 2 miles, with the beam 'about the size of a golfball'. His house is roughly 5 miles as the crow flies, and on a remote hill, easily seen from my position, with no houses or lighting sources in between.