I use self res for night falls and the crota fight, and when I use sunsinger in pvp, I use radiant skin, and I generate orbs at the beginning of the fight and when I need health because I use light beyond nemesis for the orb regeneration perk on HM cause I have nothing better at the moment. I use void walker for the whole raid except crota, because I don't wanna be the guy that causes a wipe