On Sun, 29 Jul 2012 21:50:06 -0700, Jim Thompson
wrote:

Maybe make it wind-powered ?:-)
...Jim Thompson

Only if you have a suitable source of rising hot air directly under
the fan blades. However, without a ducted fan arrangement, it will be
rather inefficient.

You might be thinking of an outdoor wind turbine. You could install
it on a rooftop tower, run a speedometer cable to the indoor fan
through the ceiling, and drive the indoor fan directly.

Powering the LED's on the fan blades is fairly easy. Attach iron core
solenoid coils near the ends of the fan blades. Install a circular
ring of magnets with alternating polarities around the circumference.
Such a generator should provide sufficient capacity to run the LED's.

--
Jeff Liebermann
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558