red diodes

Frederic Preffer preffer at
Fri Nov 12 10:04:50 EST 1999

Hello Alice, and everybody

I know exactly what is going on. The red diode lasers available stink.
Average lifetime in our instrument is about 5 months.  My recommendation is
that no one purchase a FACSCalibur without demanding a 2 year warrantee on
the red laser; better yet, 15,000 hours of time.

F Preffer

At 08:39 AM 11/11/1999 EST, Alice L. Givan wrote:
>Hi Flowers,
>What are people's experiences with red diode lasers?  I have been told
>that the manufacturers rate their lifetimes at 15,000 hours --- but
>that they seem to need replacing in cytometers after about 6 months.
>Is this true?  Any ideas as to what is going on ?
>Alice L. Givan
>Englert Cell Analysis Laboratory
>of the Norris Cotton Cancer Center
>Dartmouth Medical School
>Lebanon, New Hampshire NH 03756
>tel 603-650-7661
>fax 603-650-6130
>givan at
         Frederic I. Preffer
preffer at
Department of Pathology- Room 7140
149 13th Street 
Massachusetts General Hospital-East
Charlestown, MA 02129
v(617) 726-7481  fax (617) 724-3164

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