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I have a 5mw lazer and it's plenty bright enough. I know people with 20mw ones and they are definitely easier to see (not that mine is hard to see). But this is the way I see it: 5mw is easily enough, and already strong enough to blind someone. 20mw may be better, but accidentily point it at a reflecting surface or someone else and the resutl could be very bad, not worth the extra brightness.
You know how it is in the dark - thumbling around for things and all, it can be possible to not realise you have it pointing the wrong way, or accidentily hit the on button when it's not fully in your grip pointing the correct location, etc.
So I'd go with the 5mw.
Just make sure you keep it in your pocket. I find an enormous difference in performance based on temperature. Once the batteries get a little cold it becomes significantly fainter. Same for all strengths.
Roger.
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