New reviews at The LED Museum (Part 5)

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The_LED_Museum

The_LED_Museum

*Retired*
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Continued from here...


New evaluation: Executive Style Pen w/Laser

penlas1.jpg


http://ledmuseum.candlepower.us/tenth/penlas20.htm

Rise and shine CPF! It's 0624 hours! Early bird gets the gagh! ;)
 
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The_LED_Museum said:
I've heard (from "the horse's mouth" as it were) that the 5mm NUV LEDs are going to be replaced with two ~254nm fluorescent light bulbs sometime in the not-too-distant future.
Click to expand...

This move makes a lot of sense, as there are stamps that are coated with phosphors that only react to shortwave UV. I believe this is done to enable sorting machines to differentiate between different classes of stamps.

A long time ago I remember that "air mail" stamps were coated with a phosphor that would produce a bright but extremely brief flash of phosphorescence (after-glow) when a shortwave UV source was turned on and then off. I was experimenting with one of those stamps under an unfiltered shortwave UV germicidal lamp to see if I could see the phosphorescence. I recall that the only way that I could see the flash was if I closed my eyes, turned the UV lamp off and then opened my eyes at the exact moment that the lamp extinguished, then I saw a flash that was less than a half-second in duration.
 
As far as I'm able to determine, they're grain-of-wheat incandescent bulbs, not LEDs as the catalogue indicated - and why I purchased the silly thing to begin with. :green:
I just now examined it very closely, and yes, they're incandescents, not LEDs.
 
Oh well, it's still very colorful anyway! Hmm, also wondering about the tp being on the outside.... remind me never to shake Santa's hand! :laughing:
 
I found your website years ago about 2001 at my friends house when I was looking for something to make my 3D Mag light run longer. That night I discovered LED's, thank you for that Craig Johnson. I just recently found CPF and now you again, full circle huh? Anyway keep up with the great work and thanks again!
 
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