That makes perfect sense to me. First, I'd be shocked if good glass (say, Borofloat) wasn't optically superior (in most respects) to Lexan / polycarbonate. Second, humans are very non-linear animals, but particularly so where aural / visual senses are concerned. It all makes sense to me. You must have gotten up on the right side of the bed today.I've gotta say that my old 80's 2D Maglite seemed brighter with a glass lens. It just seemed to throw a little farther. Once I got above 2cells I really didn't see a difference. Like in a 3D or 4D using alkalines the output through a glass lens seemed about the same. But when it was only tossing out 25 or so lumens, my eyes said "check it out, that looks brighter".