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This topic comprises 2 pages: 1 2
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Topic: Theatre money plight not as bad as it looks
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David Kilderry
Master Film Handler
Posts: 355
From: Melbourne Australia
Registered: Sep 1999
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posted 01-10-2001 04:53 AM
Michael,We have had 4 "in warranty" failures of xenon lamps in the last 4 months. Two were explosions that took the mirrors with them. On a circuit of 250 plus screens we have had 5 explosions in 6 years, ALL were under the manufactuers warranty hours which suggests faulty lamps, poor transport or incorrect installation. All rectifiers and air-flows were checked after explosions. We do not allow lamps to travel past 5000 hours these days although two cinemas close to my office have just hit 5,500 with 18 footlamberts plus on c/s, no flicker or darkening of the quartz envelope evident. They are being removed this week. When you have heard a 5kw lamp go bang, everything else is an anti-climax! Switch-on, oh, look at the ammeter bounce aroun.......................BANG! We now run many more big lamps including 4,000, 4,500, 5,000 and at present we are installing more 7,000w lamps, but only in Kinoton projectors with water cooling. David
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Mark Gulbrandsen
Resident Trollmaster
Posts: 16657
From: Music City
Registered: Jun 99
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posted 01-10-2001 12:16 PM
There has been an addition to most manufacturers lamps in the last 5 to 7 years that allows them to last longer. This is due to the addition of a getter to collect the vaporized tungsten. Before these getters were built into the lamps the envelope darkened dramatically near and just past a lamps rated life. Since the getter is there to collect the vaporized tungsten,the lamp envelope stays clear and does not darken. Hense pressure and heat are not contained within the lamp like they are in one with a darkened envelope. The result is a longer life lamp that puts out more light and there is less likelyhood of a lamp explosion. For those that are nervous about changing a high hour lamp all you have to do is to wear the proper protective gear. This includes a full face shield, bullitt proof vest, and gloves as well as heavy clothing. In some states this gear is a normal state requirement when handling ANY xenon lamp. To refuse to change a lamp is ludicrous! I don't know anyone that can afford to turn down a lamp sale or service call!
Mark
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