Harold Hallikainen wrote:

> Since there is no current limit resistor, the circuit should be pretty
> efficient.  You could put a bunch of LEDs in series across a single
> inductor.  Anyone tried anything like this?

  Tried, no.  The concept came up in previous "most LED efficiency from
your battery-powered PIC; no resistor" discussion, didn't it?
--
  Cheers,
        Paul B.