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Topic: Anyone use LTI xenons?
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David Favel
Jedi Master Film Handler
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Posts: 764
From: Ashburton, New Zealand
Registered: Feb 2002
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posted 04-30-2002 04:48 AM
I used Ushio for years. I tried an LTI just after they started & was pleased with it. It failed after 750 hours so they are sending me a replacement. One happy customer I am.Have had little luck with Osram. The least I have had from Ushio was 1800 hours The most was 2800 hours & I use that as a spare. Small flicker but .... Osram was the one that failed today after 5 minutes. Funny side effect, it turns your trousers brown.
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Scott Norwood
Film God
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Posts: 8146
From: Boston, MA. USA (1774.21 miles northeast of Dallas)
Registered: Jun 99
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posted 02-03-2003 05:53 AM
(...digging up an old thread...)
For what it's worth, one theatre where I fill in fairly regularly bought three 2kw LTI bulbs a little over a year ago. Previously, they had used Osram 2kws.
With relatively new Strong lamphouses (installed circa 1998) and good ventilation, the Osrams lasted about 3500-4000 hours at 75-80 amps, which I consider to be very good. We pulled them at 4000, regardless of flicker or brightness; several were still good at that point. Now the LTI bulbs are starting to flicker at about 2500 hours (one quite badly), which isn't unreasonable, but is much worse than we were getting with Osrams. Operating conditions have not changed.
The LTI bulbs were all purchased at the same time, so we may have gotten a bad batch, but they probably won't be ordering LTI again soon. The quality of light was quite good for both, but Osram appears to be cheaper on a per-hour basis.
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John Pytlak
Film God
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Posts: 9987
From: Rochester, NY 14650-1922
Registered: Jan 2000
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posted 02-03-2003 02:30 PM
Opinions about how much beyond the rated life vary, but the guideline cited by Mark Gulbrandsen is a good starting point:
quote: Anyway, running lamps as long as you are saying is dangerous and will eventually result ina loss of your reflector, or RH mirror. I always say not past rated life plus 10 to 15% extra.
Much will depend on things like proper ventilation, current ripple, lamp type, etc. But once you have a lamp explode due to excessive age, you'll wish you had replaced it sooner.
BTW, old lamps with imminent seal failure or vitrified quartz are especially dangerous to handle, even when cold. Follow all safety precautions rigorously --- or that old lamp may be the last thing you see.
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