LED Lenser X21 Flashlight Lightning Review: Really, Really, Really BrightSam Biddle9/15/11 4:30pm96EditPromoteGo to permalinkMaglite's 4 D-cell flashlight spits out around 120 lumens of brightness. The mammoth LED Lenser X21 shoots out 1,200. It's blindingly bright. It lights up entire rooms on its own. It will hurt your eyes. A lot.