Love how people are like "oh but you need radiance or you die a lot" like, well, yeah. We use that to run out and deal as much damage to everyone as we can, knowing we're going to die eventually. It causes me personally, cant speak for every warlock, to just run out carefree with my shotgun and blow pounds of damage into enemies, if they don't die. My teammate's jobs are made easier to just pick them off. And then just self res and find cover with my team, picking off the stragglers until I get to blast them in the face with shotgun shells again with no self preservation in mind.
Feel free to spit on that tactic but I've never once needed to be carried as a warlock and that tactic generally clears rooms quite quickly. It works for me, my team. But if anyone else has a better way to use radiance, I've always wanted to learn em.