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I use a 50mw and its probably over kill however compared to my mates 5mw his you need to strain to see where as mine is like a deathstar.
Being so bright helps not so astronomy minded people easily see it and see what you are pointing at, you know those kind of people who go camping with flood lights and shine head torches in your face while you try and point out constellations.
I saw an American using one of those 1000mw ones and in the photo it was very intense but I think NASA might have something to say about if you were to shine it at the ISS "Astronaut blinded by land based laser"
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