A Mote of Light is a type of currency that can be used to purchase items from The Speaker and Xûr. In the Taken King, Motes can be used as a consumable to award an amount of XP to the player and his/her munitions.
Once a Guardian reaches level 40, any experience earned goes to acquiring a Mote of Light. One Mote of Light requires about 80,000 experience. Motes can also be awarded randomly for completing Crucible matches, completing Vanguard Strikes, in loot chests, in rare engrams, dismantling rare armor and weapons or finishing a Public Event with gold ranking.
- (2014) "Anyone know how much XP it takes to get a Mote of Light after level 20?". Reddit. Retrieved 19 November 2014.