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Re: Frustrating Flicker in Fluorescents (WAS: Season misconceptions innewspaper)



-----Original Message-----
From: Larry Cartwright
Sent: Thursday, June 26, 2003 7:12 AM
Subject: Re: Frustrating Flicker in Fluorescents (WAS: Season
misconceptions innewspaper)
The new strategy is to use fewer and brighter phosphors, perhaps as few
as 3 (e.g. red, green and blue). When one looks at the spectrum
produced by a tri-phosphor coating, one is tempted to predict a garish
and unpleasant outcome. But the actual result appears quite
attractively "white" to most people. It makes sense if you remember
that your TV and your computer monitor create "whiteness" using only 3
phosphors.

For those interested in a nice discussion of lamp phosphors, see:

"Lamp Phosphors" by T. E. Peters, R. G. Pappalardo and R. B. Hunt, Jr.,
Chapter 10 in Solid State Luminescence: Theory, materials, devices, ed. by
A. H. Katai, Chapman and Hall (1993).

Larry Woolf
General Atomics
3550 General Atomics Court
Mail Stop 78-110
San Diego CA 92121
Ph:858-526-8575
FAX:858-526-8568
http://www.ga.com
http://www.sci-ed-ga.org