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There's a video at the bottom of this page showing difference:
http://www.sp-dynamo.com/8seriesdynamo%20hub.htmlWhen riding, I don't notice anything. It'd have to be ~10W difference between on/off before it became obvious enough.
hippy
Every day's a school day!
I've tried spinning the wheel with the light on and off and I couldn't tell the difference.
Maybe irs too subtle for me to have noticed. I'll try it again.
Cheers for the electronics/physics lesson.