This is topic Storing Xenon Bulbs in forum Film Handlers' Forum at Film-Tech Forum ARCHIVE.
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Posted by Aaron Mehocic (Member # 15) on 10-01-2000, 10:16 PM:
Just a quick question:Does it matter if a xenon bulb is stored in a vertical or horizontal position for long periods of time inside a locked cabinet? In other words, can devitrification occur faster if the bulb is in one stored position over another position?
Thanks for your input,
Aaron
Posted by Steve Guttag (Member # 268) on 10-01-2000, 10:52 PM:
It is wise to store larger lamps vertically with the postivie end down but I don't have the stats...If you get Christie xenon lamps they will have an arrow as to which end is up for storage.
STeve
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"Old projectionists never die, they just changeover!"
Posted by John Walsh (Member # 168) on 10-02-2000, 04:45 PM:
Storing them vertically is what we do, too. The reason (I heard) is the heavy tungsten piece inside might bend down over time.What is (de)vitrification with a xenon bulb? My dictionary says: "vitrify: to change into glass or into a glassy substance by heat and fusion."
Posted by Gordon McLeod (Member # 33) on 10-02-2000, 05:18 PM:
It is the breakdown of the quartz to glass seal
Posted by Randy Stankey (Member # 64) on 10-02-2000, 07:25 PM:
Xenon bulbs are installed into lamphouses either horizontally or with the large electrode up and it doesn't hurt them.If you look on the Christie box, it says that the arrow goes up for shipping.
Posted by Richard Hamilton (Member # 321) on 10-02-2000, 07:35 PM:
If you go by the arrows on the outside of the box, that means you can't take the bulb out and inspect it when you receive it. 
Posted by John Pytlak (Member # 331) on 10-03-2000, 11:37 AM:
I doubt that "electrode sag" is much of an issue with storage of cold xenon lamps. Horizontal lamps are rotated to even out any blackening of the bulb, and to overcome the slight "sag" over time of the hot electrodes. The arrows on lamp cases probably indicate the optimum direction to minimize the risk of lamp breakage during shipping, if the case is accidently dropped. I prefer storing individual cased lamps on their side, only because if stored vertically, the cases could more easily tip over and fall out of the cabinet.------------------
John P. Pytlak, Senior Technical Specialist
Worldwide Technical Services, Entertainment Imaging
Eastman Kodak Company
Research Labs, Building 69, Room 7419
Rochester, New York, 14650-1922 USA
Tel: 716-477-5325 Fax: 716-722-7243
E-Mail: john.pytlak@kodak.com