I don't know what an average lifespan might be; I would think it depends
upon the wattage of the tube it is filtering.  My understanding as to why
the filters expire is that they become saturated, i.e., the filters absorb
the UV rays and they can only hold so much.

Catherine Bruck
University Archivist
Illinois Institute of Technology
Paul V. Galvin Library
35 W. 33rd St.
Chicago, IL  60616
312/567-6840
FAX 312/567-5318
[log in to unmask]

-----Original Message-----
From: Archives & Archivists [mailto:[log in to unmask]]On
Behalf Of Heidi Dressler
Sent: Wednesday, December 12, 2001 4:57 PM
To: [log in to unmask]
Subject: UV light filters


Hello,

Can anyone tell me what the average lifespan of a UV filter sleeve for a
fluorescent light bulb is? (And for bonus points, why they expire, if they
do.)

Thank you,

Heidi Dressler
Local History Librarian
Wichita Public Library

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