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I have had a 5mW for some years and find that quite adequate for my purposes. I also have a licence in Victoria to possess, store, use this "prohibited weapon". But, as I saw them vanish from Australian catalogs, I thought I'd better get another in case my laser failed. I couldn't buy less than 20mW, from a Queensland supplier, so I bought it. 20mW is more than I wanted and, on testing, is clearly more than I need.... except for pointing to a light-polluted sky for a large group of people.
I have not seen a reason for using >20mW and in most cases, for scope pointing and small group use, 5-10mW would be sufficient.
I will be interested to see how you go justifying 100mW.
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