RE: Connectix QuickCam problem

Marc Lindahl (shark@dti.net)
Thu, 4 Apr 1996 04:37:28 -0400


>Bzzzzt...wrong...thanks for playing.
>
>To be perfectly correct, unless one's incandescent lights are
>connected to a DC power source, they are turning on and off
>at whatever your AC powersource's line frequency is (60 Hz in
>the States, 50 Hz here in Australia).
>
>It only -looks- continuous to the human eye. To the degree that a
>a camera is sensitive to light transitions is the extent to which
>flicker will be faithfully reproduced.

NOT! Incandescent bulbs GLOW. The tungsten filament does not cool down
between current bursts (which by the way are 120/100Hz, since they conduct
on both halves of the sinewave). Flourescents on the other hand are
completely off most of the time -- the gas has a 'trigger' or threshold
voltage at which it ionizes.

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shark@dti.net (Marc Lindahl)
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