OK, then I take it that the regulation is in the light, not the dynamo. As I've said, I've run the light with no problems. And Loogi, I forgot about load. You're right that I measured it without a load. I'll put a load in and see what I get. As long as I have enough light, I'm OK, but I wonder if producing too much power is why it's so much draggier than a hub dynamo.