In my case, it's less often the environment itself and more often my character I'd like to see better. As someone who cares about the cosmetic look of outfits, it can be annoying that in order to really see how a given piece of gear looks on me, I have to find someplace with good lighting. It'd be nice to have a feature that will temporarily let us see as though we were in bright sunlight regardless of our location or the current in-game time and weather conditions.