Originally Posted by noglider

Funny you started this thread because I just got to thinking about something similar. In my case, I'm thinking of running lights made for dynamos but with a USB battery pack instead of a dynamo. My favorite battery is the Anker Astro E1 rated at 6,700 mAH. The 'm' is small because it stands for "milli." The E1 costs about $25. Someone here proved that even though dynamo lights expect A/C, they do OK with DC. I have to work out how to mount the battery to the bike and how to run the wiring. Neither should be hard.

Headlights made for dynamos have some advantages. They're not as bright but for many of us, they are just as effective because of the beam shape. No one knows how many lumens they put out since they're rated in Lux rather than lumens. My guess is that they're 200 or 300 lumens. Honestly, it's enough for me. I get compliments on how sharp the light looks, and I see pedestrians noticing my light and backing off on their plans to cross my path.