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LED UV emissions?

Discussion in 'Hobby Electronics' started by Wayne., Mar 5, 2009.

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  1. Wayne.

    Wayne. Guest

    Just curious, but does an off the shelf white or blue LED emit any UV of
    a usable level?

    I use a CFL for UV exposure, but it is a PITA to set up, and for the
    cost of one UV LED, I can by a bag of 10 ultra white or ultra blue LEDs.
  2. **Even better, you can buy UV LEDs. They're not really UV, they're deep
    purple, but they do the job. I've used them in place of unobtainable cold
    cathode UV tubes.

    Jaycar ZD-0260
    Farnell 105-7106
  3. Clint Sharp

    Clint Sharp Guest

    Just be careful not to overdrive them or you might get smoke on the
  4. Wayne.

    Wayne. Guest

    For the cost of one from Farnell, I can buy 10 blue/white LEDs.
  5. K Ludger

    K Ludger Guest

    Very sharp! :)
  6. ian field

    ian field Guest

    The "stupid with a flare gun" inspired the only good single they ever did!
  7. **You asked about UV, not white or blue. If you want UV, use a UV LED.
  8. ian field

    ian field Guest

    You obviously didn't read what the OP said!
  9. **I did. He clearly failed to read what I wrote. You want UV, use a UV LED.
    I don't know how much UV is delivered by a blue or a white LED. I do, OTOH,
    know that a UV LED delivers UV. A UV LED may deliver 10 (or 100) times the
    amount of UV that a white or blue LED delivers.

    It seems simple enough. He wants UV light, he uses UV LEDs.
  10. Bob Parker

    Bob Parker Guest

  11. Bob Parker

    Bob Parker Guest

    I've bought quite a lot of stuff from Lance there. Excellent LEDs
    and other things at good prices, in my experience. :)
  12. Jasen Betts

    Jasen Betts Guest

    I seriously doubt that any blue/white ones emit more than a 2% UV.
    but check for yourself farnell have links to data-sheets (and
    most of them work)

    wikipedia says UV is wavelengths smaller than 400nm, and a quick
    search of a different site found no datasheets for visible light leds
    that emit a measurable amount of UV

    AIUI UV LEDs are made out of a different semiconductor to those used
    for visible LEDs.
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