aka Tom Reingold
Join Date: Jan 2009
Location: New York, NY, and High Falls, NY, USA
Posts: 40,502
Bikes: 1962 Rudge Sports, 1971 Raleigh Super Course, 1971 Raleigh Pro Track, 1974 Raleigh International, 1975 Viscount Fixie, 1982 McLean, 1996 Lemond (Ti), 2002 Burley Zydeco tandem
Mentioned: 511 Post(s)
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My understanding is that a hub dynamo can produce a range of voltages depending on speed. Lights built for dynamos are designed with the assumption that the bike may not go faster than the speed that produces 6V even though it does at times. If you ride fast, you should be able to get 7.5W, but I don't know about the voltage curves of dynamos.