Tungsten-Halogen Replacements

[DavidH8083@xxxxxxx]

I am reposting this, since the first version never made it to the list.

For those of you who requested info on the quartz-halogen replacements for
TDC 3-D slide projectors....

OK, now that I have my Sylvania handbook in front of me, I can answer your
question about the tungsten-halogen quartz replacements for the standard
incandescent projection lamps.  The TDC projectors were built with a
lamphouse that uses the same sort of bulbs that standard theatrical fresnel
spotlights once used.

So, here's the list:

Both the BTL and the BTM are 500 watts-the BTL is rated at 11,000 lumens, a
color temp of 3050 degrees K and a life of 750 hours; the BTM is rated at
13,000 lumens, a color temp of 3200 degrees K and a life of 100 hours.

Both the BTN and the BTP are 750 watts-the BTN is rated at 17,000 lumens, a
color temp of 3050 degrees K and a life of 500 hours; the BTP is rated at
20,000 lumens, a color temperature of 3200 degrees K and a life of 200 hours.

And now for the really brave, the BTR is rated at 1000 watts with 27,500
lumens at a color temperature of 3200 degrees K and a life of 200 hours.

My little New York City studio apartment was wired when Edison was still a
boy, so I don't dare use anything bigger than the 500 watt lamps-and even
then I have to make sure that everything else in the apt is turned off,
including the refrigerator.  But you more modern guys with lots of power can
go for the big guns, if you projectors don't melt down or your polarizers
fry.

I buy the bulbs locally, but then here in Manhattan, I am surrounded by
theatrical supply houses and lighting companies; those of you outside the big
cities will probably have to find a mail order source. There is also a neat
little insertion tool the grips the ceramic base of the lamps allowing for
easy removal and installation.

David Hutchison
STARLOG Magazine
davidh8083@xxxxxxx


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