Originally Posted by steelbikeguy

I've heard favorable comments about using modern LED headlights with dynohubs from other sources too. It also suggests that the dynamo is producing 6v with that load. A further reading of Sheldon's (and John Allen's) info on the dynohub does specifically state that it is intended to be a 6v dynamo.
https://www.sheldonbrown.com/dynohubs.html

I fully agree that dynamos with incandescent bulbs produces a barely tolerable stream of photons.
How did we ever survive? Of course, I do recall augmenting my little Jos block dynamo with a Cateye Micro II light. Between the two of them, I managed to see most potholes and roadkill.

Steve in Peoria