Re: 750 watt lamp in a VM stereomatic

[P3D Elliott Swanson <e3d@xxxxxxxxxx>]

Re: John Ohrt's response in the previous digest--

John Ohrt is approaching this from exactly the staindpoint I was trying to
get at. Thank you John. The real trick is figuring how how much heat is
dissipated from the halogen. I know the heavy cooling isn't good for the
lamp, but the increased light output makes the combination very tempting
(the rating for the BTP halogen is 200 hours of operation at 20,000 lumens
@ 3200K). The VM is definitely under illuminated.  Wolfgang Sell posted
that Walter Sigg had run a 750 watt tungsten in a VM, and while it worked,
the heat had permanently bowed the chips in the reels (which means they
will scratch when you try to run them thru a viewer). Wolfgang's advice--
don't stick your House of Wax movie preview reel in there!

So what I'm coming up with is that the socket and electrical components
should handle the 750 watt draw. This has been tested by Walter. Thermal
stress factors re halogen lamps is another matter entirely, and a cause
for concern. Probably what is called for at this point is an actual
empirical test measure of heat output in the VM environment. (And since I
don't own a House of Wax movie preview reel, this is not a problem...  :) 

--Elliott




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