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Posted by NunYa Bidness on 10/24/05 17:38
On Mon, 24 Oct 2005 11:00:29 -0400, John Harkness
<jharkness@sympatico.ca> Gave us:
>Actually, it's not done to save power.
>
>It's done to prolong the life of the bulb. Those boys is expensive.
>
>Oh, and it's cheaper to air condition an empty theatre than it is to
>air condition a full one.
>
>John Harkness
Reducing the voltage to the bulb does not increase its life.
If anything it would be reduced as the stress on the bulb's filament
is related to mechanical / thermal expansion and contraction, and said
filament, if giving off white light, has already had said motion
applied to it.
So it does not increase bulb life.... at all.
I would think that they are fed by DC as well, since they would want
flicker effects to be minimized. If that is the case, then it would be
even harder to make the circuit for adjusting the voltage down. One
doesn't simply reduce the line voltage at the projector plug for this
to occur. It ain't no easy task.
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