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Topic: How many hours can you get out of a xenon
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Randy Stankey
Film God
Posts: 6539
From: Erie, Pennsylvania
Registered: Jun 99
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posted 05-07-2002 06:48 PM
I've always gone by the rule: Warranty + 25% but sooner if it needs it.
(It flickers, gets hard to strike, the glass gets dark or if you just get a bad feeling about it.) I have personally seen a lamp that was supposed to be pulled at 1900 - 2000 hours get run up to almost 7000 hours.
I got a call to go to this theatre becase, "The light was acting funny." I opened the lamphouse, looked inside and said, "Change the F***ing lamp!" I have a picture of it . I believe I posted it on this board somewhere.
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Brad Miller
Administrator
Posts: 17775
From: Plano, TX (36.2 miles NW of Rockwall)
Registered: May 99
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posted 05-09-2002 01:50 AM
Will, I've nothing nice to say about Perkin-Elmer bulbs. They don't put out the light that others do, they are far from reliable or stable, they come in packaging that mine as well be kitchen Saran Wrap, by the time they hit half life they are difficult to strike and not a one of them was putting out acceptable light by the time they hit their warranty period. In fact, by 75% of their warrantied life, I was usually groaning at their performance biting my tongue just waiting for the warrantied hours to hit so I could pull them. I might also add that these were used in Christie SLC lamphouses which are the best I've ever used. For several years this theater ran exclusively Christie lamps in them, but as soon as the company switched to Perkin Elmer lamps the following started to happen:  It is important to note that these reflectors were PERFECT for several years before the theater started using Perkin Elmer bulbs! I've also found that the Perkin Elmer bulbs are quite substantially "out of round". Here is a very short downloadable video showing a Perkin Elmer bulb being rotated.
LARGE QUICKTIME DOWNLOAD 1.27MB
MEDIUM QUICKTIME DOWNLOAD 863KB
SMALL QUICKTIME DOWNLOAD 286KB What's that term? "Penny wise and pound foolish". That is the definition of these lamps as far as I am concerned. The slight cost savings on one of these lamps for say 2000 hours worth of use vs. buying a Christie or OSRAM and getting several thousand hours worth of use is just a foolish purchasing decision. I am THRILLED that this theater is finally back to buying Christie lamps!  Disclaimer: these are my opinions and findings. I'm sure if anyone else out there has actually had good luck with these lamps they will post here.
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