You can neither see into or out of that sphere, which means it's not very helpful when it gets cast on your entire party, especially when your opponents have area-of-effect spells at their disposal. Their light-fueled misadventures would be embarrassing enough on their own, but they also confess to a multiplayer-based horror with the spell Darkness, which conjures a sphere of, well, darkness in an area. I think my favourite confession comes from user Fluffy-Tanuki, who says they have repeatedly attempted to hide in bright light, thereby wasting both their action and their bonus action.