dealsjetbeam pa20 edc 230 lumens tactical flashlight…

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I want to go on a trip to the mountains and I will camp in a forest where you climb the mountain. In this regard, I want to buy a good torch and military Flashlight. I've searched and I found a pattern:
http://www.youtube.com/watch?v=UBBJEqsin84
What is the difference? Which is better?