uv led 395nm source

rnldef

Newly Enlightened
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Mar 6, 2008
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:anyone:
I am looking for 5 mm UV LEDs about 395 nm that do not have the epoxy degradation problem that causes loss of UV output over time - http://wolfstone.halloweenhost.com/Lighting/bltled_LifetimeIssues.txt .
Intended for use in an art project involving uranium glass and glow pigment.
I saw a 375 nm TO-18 metal can with glass lens for $7 at LED Museum but can't find it online and I would rather work with the higher wavelengths for safety reasons.
Any leads?
 
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Have you tried ebay yet? I've bought 395's and 365's on ebay in the past. I think you just have to accept the epoxy degradation if there is any. I can't recall ever seeing a 5mm led that was glass.
 
:thanks:
In an email from a Cree rep. he said when they took a "bad" UV led and removed and remounted the die in a new epoxy mold, it regained it's original UV output. Maybe this is one reason why they stopped manufacturing these apart from lack of worldwide demand.
I did notice that some inexpensive 395 nm from a Hong Kong ebayer did not fluoresce Vaseline glass as bright as ones mfg by Cree. I have about 90 of these HK LEDs that I don't need.
Maybe UV flashlight users won't have as much of a UV output loss issue because theirs is only intermittent use, but for display cases for Vaseline glass or minerals that may be left on for hours a day, the epoxy LEDs would probably need to be replaced regularly.
Regarding Nichia's liability release form, is indirect or reflected viewing of light from 375 nm LEDs any more dangerous than that from black light poster lamps?
 
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