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Author
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Topic: How to make a xenon lamp.
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Stephen Furley
Film God
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Posts: 3059
From: Coulsdon, Croydon, England
Registered: May 2002
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posted 04-18-2013 06:16 AM
We used to have a member who worked at a company that made xenon lamps. I haven't seen any posts from him for a long time, but maybe somebody else knows the answer to this.
Apart from the high temperature required to work quartz, blowing the bulb for a xenon lamp wouldn't be particularly difficult. Sealing the electrodes into the quartz is a different matter, but I have a rough idea how it is done. What I don't understand is this; I've done a bit of work with low-pressure lamps, I'm actually going on a neon sign course tomorrow. Sealing off these lamps is easy, you just heat the exhaust tubulation with a gas torch and as the glass softens it sucks in under the near vacuum inside, and seals off the lamp. However, this obviously isn't going to work with a lamp which is significantly above atmospheric pressure even at room temperature. So, how do you seal off a xenon lamp? Do they put the whole lamp inside some sort of container at a higher pressure than that inside it or something?
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Carsten Kurz
Film God
Posts: 4340
From: Cologne, NRW, Germany
Registered: Aug 2009
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posted 04-18-2013 10:42 AM
The free online publication of CinemaTechnologyMagazine had lab reports from Philips/LTI and OSRAM in past editions (18 and 20) - lot's of information regarding specific manufacturing issues, history, photos, etc.
After you read both articles, you understand that
- xenon bulbs are still delicate to make - manufacturers basically have options to either utilize a high degree of automation/machinery, or a very well trained staff with a high amount of manual work. Both methods have their pro's and con's.
One statement from a european USHIO representative once was, that USHIO also uses a lot of manual work with very specific and long time trained knowledge on their bulbs.
Knowing this may also explain why some manufacturers sometimes have higher failure-rates or why changes in the manufacturing logistics can have such a high impact on product quality.
Xenon manufacturing obviously has no place for hire&fire staffing policy.
http://emag.cinematechnologymagazine.com/
http://emag.cinematechnologymagazine.com/Index.aspx?issue=issue20
http://emag.cinematechnologymagazine.com/Index.aspx?issue=issue18
(I know it's one of these strange online readers, but registration is free, painless, no spam, no issues, and reading is always very interesting)
- Carsten
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