"For those times runtime claims seem overly inflated, Michael Hess, vice president of marketing for Armament Systems and Procedures, warns that when “…you look at four models that are about the same size, with similar claimed output, using the same power source — two CR123A batteries or one 18650 cell, for example — and one is claiming twice the runtime of the others, be a little skeptical. It is true that similar lights and batteries can vary significantly in performance, but just be a little cautious about dramatic outliers when it comes to specs.”