OK, so I'm giving Sunsinger a test run and exploring Earth with my friend. Suddenly we find a new cave with crazy spawns in there... stuff is rushing out like crazy. I kill a few Thralls and Radiance comes up! I activate Radiance and jump into the stream of enemies spewing from the cave. I literally fill the cave with Sun Grenades so much so that the poor critters spawn already in flames and die less than a second after materializing. The floor is littered with ammo and even some engrams drop. My friend in the meantime tries to locate stuff to kill because most of them never make it out of the cave! So... OK, Sunsinger FTW! :)