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[Physltest] [Phys-L] Re: LED mini-flashlight price break



Hi all-
This seems to be the new technology in high-intensity LED's. They
are beginning to appear as traffic lights, and heaven knows what else.
Google gave me thousand of hits on something like "LED stage lighting".
Regards,
Jack



On Wed, 26 Jan 2005, John Denker wrote:

Next to the checkout stand at Walgreens they are selling
little LED flashlights for $1.00 apiece. Your choice of
-- red
-- green
-- blue
-- white

I remember when they sold for many times that price.

These are *not* lasers ... they are not collimated and
they are not monochromatic. But the colors look reasonably
intense.

They're remarkably bright for their size (2cm*2cm*.5cm),
the "bulb" will never burn out, and battery life is very
good.

They're great fun to play with. You can arrange three
primary colors in a circle, pointing inward, and make
little Venn diagram with white in the center.

Also remember, if you don't have a nice diffraction
grating handy, a CD (especially a blank CD-R) will do
the job after a fashion. (DVDs don't work.)



--
"Trust me. I have a lot of experience at this."
General Custer's unremembered message to his men,
just before leading them into the Little Big Horn Valley
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