Many years ago a fairly quantitative report on the performance of
bicycle lighting dynamos was published on the Web. The link is
http://www.myra-simon.com/bike/dynotest.html

Most of the brands named are long gone. Is there a more modern
report of similar quality to be found? I've looked and found nothing
remotely quantitative, just a lot of exuberant descriptions. There
seem to be a considerable number of new (mostly hub) dynamos, hopefully
somebody has measured what they can do.

Thanks for reading, and any guidance,

bob prohaska