E. Walter Le Roy wrote:
We have a 7 foot water wheel in a mountain stream and would like to hook up
an alternator, and light up the fish pond. Can anyone tell me what RPM it
needs to turn to run one headlamp?
Thanks
Walt

Here is a URL for some people that built wind machines complete with the
direct drive alternator: http://www.otherpower.com/trips1.html It is
very cool how they did it. The alternator arrangement probably could be
modified to work with a water wheel.

Good Luck,
Bob