had Raleigh RSW bikes with either drum or Dynamo hubs.
The have 16" wheels and roll ok.
Even blew a bulb going up hill on one.
But the bulb may have been 30 years old
My Blue Falcon has a Dyno hub with a normal light with no switch.
Same as on a Viking racer I used to have
People called it a Volvo. As lights on all the time