I am curious regarding the visibility of a green laser beam with a long-distance focus ie more or less parallel beams. I know that especially for green lasers with power greater than 50mW or so, the beam is very visible in low light conditions, but this is from the holder's point of view. How visible would the beam be from an onlooker who is say 300 meters (1,000 ft) away from the beam and has a 90 degree viewing angle (looks perpendicular to the path of the beam). How visible would that be? Would it still be as strong ? Anybody looked at a green laser beam from a distance before (provided that the beam was not directed at them) ?