You can flash a normal bulb at very fast intervals to get a brighter light.
However you cant make a constant light this way or it will burn out the
bulb.

----- Original Message -----
From: "Olin Lathrop" <olin_piclist@EMBEDINC.COM>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Wednesday, August 07, 2002 8:15 AM
Subject: Re: [EE]:Is this true or is it Bull .... !!


> > I have a vested interest in getting lights to be brighter for less -
> > Unfortunately I
> > don't have the money to go to HID lights.
> >
> > So - is this true or is it a crock !!
> >
> > Basically what Illustro does is this. Using a standard bulb, be it
> Tungsten,
> > Halogen or Xenon (but not HID), a 24 volt pulse is fed in rather than a
> > constant12 volts. By switching from 0 to 24 volts up to 2,500 times a
> second
> > you get a light that is 2.5 times brighter. For example a 60-watt
standard
> > Halogen bulb will give out the equivalent light of a 180-watt bulb. And
> all
> > this for the same amount or amperage!
> >
> > Page can be found at http://www.DIFFLOCK.com - New Products.htm
>
> Your link just went to some magazine main page, so I didn't see what these
> people are claiming.  However, incandescent bulbs are work on the physics
of
> black body radiation.  The only way to get more light from the same
> fillament is to increase its temperature.  Due to material limitations,
> normal incandescent bulbs operate at a lower temperature than that which
> would be most efficient for producing visible light.  Therefore, for our
> purposes, increased temperature means both brighter light and higher
> efficiency.  However, it also means reduced fillament life.  After you
work
> out all the many contributing factors, bulb life is inversely proportional
> to something like the 12th (yes, it really is that high) power of the
> voltage.
>
> I don't see how anyone can get around this basic physics without modifying
> the bulb.  The filament temperature is a function of the power supplied to
> it.  You can certainly drive an incandescent bulb with PWM.  At 2.5KHz,
the
> fillament temperature is not going to significantly change during a cycle,
> so it effectively sees the average power delivered to it, and will emit
> light based on the resulting temperature.  The usual brightness versus
life
> tradeoff should still apply.
>
>
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