Hey guys, I found a way to get motes of light fast and easy lately. Just by unlocking (don't need to actually upgrade it) at least 1 perk on a gun or armor, and dismantling it, will give you at least 1 mote of light. Every time. So you can equip all the blues you have, play some PVP, and dismantle everything as soon as the first perk is unlocked, and there you go. I hope some of you will find this useful!