I always found it amazing that all of those headlights installed on many of the 1960's "Mods" scooters could possibly be powered by the 45 watt generators in the scooters of that era.
BTW, I started riding on a 1962 Vespa 125 and it had 8" diameter wheels, which was one of its several, not so great, features, which included a lack of suspension damping, little weight on the front wheel and an ignition point system that needed to be cleaned every 50 miles. It was really scary on pot-holed roads and in stiff crosswinds.