The real "dark knight" who actually set the venue for the idea of Batman was Jimmy Dale the Gray Seal. Jimmy Dale was a playboy by day and a totally different figure, with mask, by night. And, of course, used the night as his ally. Frank Packard wrote these adventures in the early 1920s, so the Gray Seal carried a WWI era flashlight. Yet the Gray Seal was up-to-date with the technology -- flashlight, lock-pick kit, and a "powerful 100 HP" car. Always interested in preserving night vision and stealth, he would probably now use something like a small variable intensity light such as the photon or perhaps Proton having the addition of the red led as well as a photon-like UV led. Too bad the movie makers focus on Batman; the Gray Seal is a far more interesting, plausible and gritty character than Batman.