If you really want to find light geeks, go to candlepowerforums. Holy cow.
I do enjoy good, bright lights, though. Our power went out Saturday night, and I have this little tactical light that throws 700 lumens....it's slightly bigger then a mini-mag....if I pointed it at the ceiling it would reflect back down enough light to fill the entire room and be able to read comfortably with. Pretty darn impressive little light.