Strange coins I would say the easiest is probably legendary engrams. Just farm for them. You can do the weekly strikes but only once for each difficulty.
For motes of light I would say legendary engram crucible matches, strikes etc. (pretty much the same as getting coins)
English
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Do the weekly heroic strikes tie with your account or each character? Like if I do both difficulties with one character and get 9 strange coins, then switch characters and do it again, will I get more strange coins?
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You'll get more I believe.
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...well time to level up my other characters