The lumotec light comes with a built in zener diode to regulte voltage/amperage (watts) to help prevent the bulb from getting fried by the dynamo when speeds become excessive. I have a lumotec head light and am using a very cheap ($11.99 US) dynamo to supply current, and I've seen 30mph with the dynamo in the active position, and the bulb has survived with no issues.
By the way...what does RMS stand for?
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1 bronze, 0 silver, 1 gold