Originally Posted by
Looigi
Does the generator spin at wheel speed or cog speed? If it spun at cog speed, light intensity could be independent of road speed.
The generator spins at wheel speeds and does not need a lot of speed to generate full power... the hub is 47 years old but was pretty much NOS when I built it up into the wheel.
The IGH is a 3 speed with 2nd being direct drive where the cog speed matches the wheel while 3rd is a 4/3 step so the wheel will spin faster than the cog... it was an issue in the old days as there is no regulator and extremely high speeds could overdrive the bulbs.
As a winter bike it is not going to get driven that fast and an LED headlight is in the works as these are brighter, more efficient, and work well with older generator hubs.