On 11/28/05, Jinx <joecolquitt@clear.net.nz> wrote:
> > PWM-like "turn them on and off real fast" thing will work fine
> > for making the lights appear to fade in and out
>
> A filament bulb isn't going to be *that* fast because of thermal
> inertia. Moderately crude PWM would do.

 But what about the filament life time ? One of the biggest problem
of the halogen lamps appear in the cold-warm transient of the filament.
The PWM is keepig the same pulse current through the filament, even
the effect for the eyes it's a dimmer light.
I saw many lamps dying like this with a lot of electronics nearby.

cheers,
Vasile

If you want fast and
> fancy you'd have to use LEDs (no bad thing - another project for
> you)
>
> http://www.siliconchip.com.au/cms/A_30305/article.html
>
> I have the print article (a very comprehensive 10 pages), showing
> how to make the various "bulbs" etc, which I can scan
>
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