Yeah doing a bunch of Court is pretty good for getting a consistent flow of blues to slowly increase your light. Basically by using your reciprocal runes on those statues it will spawn a specific boss you have to kill in like a 3 min time limit. Only the person inserting the rune will gain the loot from the chest, but other people in the area can help like a public event. This people can have a chance to get some runes or loot by helping. Best way though is to just grind the strike vanguard playlist if you want to level pretty fast.