On Fri, 28 May 2004 08:52:32 +1000, David Duffy wrote
> Martin McCormick wrote:
>
> >        Some of those electronic light switches that are for
> >incandescent bulbs only use a SCR instead of a triac so the bulb runs
> >on half-wave pulsating DC.  If they do that in the circuit, there is
> >the other half-cycle of AC that is un-touched and will be at about the
> >same voltage no matter if the light is on or off.  The bulb will burn
> >at a slightly lower brightness because the over all energy level is
> >.707 times the RMS level, but it will basically work normally.
> >
> >
>
> "Slightly lower brightness" ?? Try it for yourself one day.
> Running a lamp with half wave is more than slightly reduced!
> David...
>
That's because the lamp sees 1/2 the voltage not .707 as was suggested.

Randy

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