The 7-LED lamphead Lupine Betty R 3600-lumen cycling light draws 40 watts from its LiIon battery pack, and is brighter than most Xenon car headlights.
And I don’t mean in theory— a night ride proves it out.
The headlights of many (if not most) vehicles approaching from the rear will simply disappear into the Betty R beam. So naturally I’d like to run two Betty R lampheads sometime soon. Then I can truly make zero concession to the night.