Posted by NunYa Bidness on 10/24/05 07:13

On 23 Oct 2005 23:20:53 -0700, "Jim Reid" <jimreid56@aol.com> Gave us:

>There's another possiblilty. There's a theater chain here in Dallas
>that I have caught turning the lamp power down on the projector when
>it's not a full house. The picture looks dark and has what appears to
>be lag in it. I go get the mangager and yell at him and a few minutes
>later it brightens up.


Do you even know what would be required to reduce the voltage going
to the projector bulb?

Also, the amount that would decrease the brightness significantly
would not be a very big change in wattage requisite at all. The
interplay between voltage input to the bulb and light output is not
linear at all. So, there is no valid reason they would need to "turn
it down". In fact, it would likely NOT cause any significant increase
in bulb life either. It could even shorten it.

The mere task of making a circuit that allows one to alter the
voltage of a device *inside* the projector, a very delicate piece of
machinery, is a very difficult one indeed.

Hypo-chondria? Perhaps.

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