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I get most of mine from turning in engrams. I hold on to them until I have a large number to turn in...and I seem to get them more often than not....might give it a try.
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You get 1 every time you level your light bar, so the more bounties, missions, strikes, etc completed the faster you level it. I've also have got a lot of motes from engrams lately, which is random. Also, I pool all my motes, coins and other materials from all of my characters in my vault so I know my total. Helps come Friday when Xur shows up and when one character needs materials for upgrades. Just a tip.