David Fontaine wrote:

> Does the bulb immediately stop emitting light when the power is cut, or does
> it "cool down"?

I used the example for purely illustrative purposes. Obviously is does
take a filament time to cool down and in fact they are specifically
designed not to. But if we were to model the filament to have a perfect
heat discharge that followed the current cycle through it in the form
of a shape edged square wave the example would fit the explaination.
LED's in fact come much closer and that is why I also mentioned them
in my example. I just didn't expect you to come along and nit pick.
If you have a better example to offer I am sure Peter would be happy
to hear it.

> Sigmund's right, it's 120 times a second ;-)

Not on a 30hz system.

-- 
Ken Tyler - 1400+ POV-Ray, Graphics, 3D Rendering, and Raytracing Links:
http://home.pacbell.net/tylereng/index.html http://www.povray.org/links/

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