Pasi T Mustalahti wrote
> > After all the lightsbulbs in SA all run off 220V 50Hz. Only sometimes
> > you detect a flicker - usually when there's a power dip. I suppose it's
> > because the filament does not dissipate its rated power and
> > illuminescence....
> >
> PTM: If you put a diode in series with a pulp you got a very annoying
> flicker in spite of the resulting 25 Hz. This same 25 Hz doesn't flicker
> in TV or movies. I have myself started to speak about the dead time.
> In case of the pulp and the diode the dead time is <50%, in movies about
> 5..10% (?) and in TV it depends of the phosphor.
snip
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Your flicker is at 50Hz not 25Hz

peter@cousens.her.forthnet.gr