> d
> >be pretty efficient.  You could put a bunch of LEDs in series across a
> >single inductor.
> >        Anyone tried anything like this?
>
> They use a technique similar to this (no inductor, no FET) for night
> flying model airplanes.  They basically just use the multiple voltage
> drops to limit current.  LOTS of LEDs in series.
>
> Andy
The helicopter guys put their LEDs(in the blades) in parallel across
a 3V Lithium or 2 Ni-Cads with no resistors.
  Mike DeMetz sect. Michiana R/C Choppers
  miked@technologist.com
  http://www.elkhart.net/~miked/