Glen Berry wrote:
> 
> Actually, a common houshold lamp can't flash that quickly. The
> filament won't cool off enough between the rapid pulses of current. So
> this isn't purely a simple case of Persistence Of Vision, it's also
> partially a case of "Persistence of Illumination" as well.

Go to the movies for a better effect ;) Actually I had a lab project with a
light sensing thing and an oscilloscope some years ago. We could easily
identify the variation of the light from a light bulb. A gas lamp produced a
very weird noise curve.

sig

(followup to off-topic)

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