Orb of Light
Orbs of Light are a type of item within Destiny. Orbs of Light recharge a player's Super meter, and are released whenever an ally uses a Super. This encourages players to use Supers frequently when in groups. Sometimes gear can have perks where collecting orbs of light heals players. Killing a normal enemy typically yields one orb, while killing a major will yield four. Ward of Dawn, which is a purely defensive super, generates about two orbs of light upon activation; however, the Defender class has other ways to generate orbs as well.
Besides using supers, artifacts are also useful for generating orbs of light by other means, such as melee or grenades.