> >Switching a simple diode in series with it will reduce the power a little
> >(30% or so).
>
> Actually, adding a series diode reduces the power by exactly 50% (1/2).

Not necessarily.  Some devices will draw more power during the remaining 1/2
cycle.  DC supplies with large filter capacitors will do this.  So will
motors because the motor will draw more current as it slows down.


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