Apologies; didn't realize I had previously responded to this thread. Anyway this is thus more a continuation.
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I suspect it is much of the "to each his own" type situation. For me, I have lots of flashlights (handhelds, bike mounts, rifle mount, bug out bags, backup power, share-out sets for contingencies, etc.). Some time back really took a hard look at the various issues centering on power to weight to cost ratios. In the end, I standardardized on 18650 based/powered devices and just began to replace things as they broke or got donated. Getting rid of things that run off various coin batteries, 123A, AA and AAA really simplified my kits. Admittedly, some situations took a bit of work; such as building up my tactical shotgun. It needed a flashlight, a laser sight, and an illuminated scope. Having found that there wasn't a viable set of those add-on that ran on a single source required work. In the end, the best answer was to mount a 4-6,000 lumen zoomable LED flashlight, that runs off a pair of 5-6,000 mAh 18650's and mounted on the left side of the barrel with a doubled-up pair of picy rail mounts, and wiring it so that its batteries powered everything on the gun. I suspect one could leave the flashlight on continuously for several days at a time before needing to recharge (or switch to spare sets of batteries). I think most folks could be well served on their bikes with 2 or 4 each 18650's and it is fairly easy to wire them up to charge off a internal hub alternator or a solar panel, if desired. Just for thoughts.