It's kind of ironic that, in order to get the ability to light up dark areas, you have to make your way through a dark area. Though the way darkness works in the games, you can still see a little bit immediately around your main character. That's not all that realistic though, and just having everything really dark is much better for jokes. It would be kind of an annoying gym to work in though. Just stand around all day in the dark and see if anyone bumps into you. Yeah... Not much fun at all.