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What Can Be Done With Them?

Discussion in 'Electronic Basics' started by Ron Hubbard, Oct 11, 2003.

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  1. Ron Hubbard

    Ron Hubbard Guest

    I found a bunch of ultraviolet LEDs at a surplus place and
    bought them for a buck a piece; they seemed like a good buy at
    the time. But I realized later that I really didn't have a
    good practical purpose for them.

    Does anyone have a suggestion for using UV LEDs?

  2. the Wiz

    the Wiz Guest

    Get some UV fluorescent chalk or paint and create some masterpieces of art, then
    use the UV LEDs to illuminate them in a darkened room.

    More about me:
    VB3/VB6/NSBasic Palm/C/PowerBasic source code:
    Drivers for Pablo graphics tablet and JamCam cameras:
    johnecarter [email protected] mindspring com. Fix the obvious to reply by email.
  3. Garrett Mace

    Garrett Mace Guest

    Make floater lights for your bike, rollerblades, kid's tricycle, the dog or
    cat, and your mailbox.

    Walk around house with an LED, resistor, and battery held together by your
    fingers and Scotch tape, pointing it at various things and saying "Hmm, not
    fluorescent" until someone else goes crazy.

    Try to make a UV circuit-board lightbox until you realize that not only is
    the wavelength too low, but milliwatts of power don't mean a very fast

    Try different highlighter markers until you find one that glows, scrawl your
    name on a piece of paper and prop it up at work with a UV LED pointing at

    Get neon cables for your computer, gash a huge window in the side and light
    it up. No reason necessary or possible.

    Resell them on eBay with a four-page-long rant extolling their virtues in
    large-sized multicolor fonts.

    Set up an admission booth to your house and require all entering to have the
    invisible UV stamp on their hand.

    Use the LEDs to create a line-following robot that follows a UV ink line
    invisible in normal light. Whoa...I think that was actually a serious
    suggestion. Maybe now I have something to do with my OWN stock of UV LEDs
    bought on impulse?
  4. Garrett Mace

    Garrett Mace Guest

    I meant *too high* of course. Frequency too low.
  5. John Fortier

    John Fortier Guest

    Sew them to the insides of your long johns for a winter tan?

  6. JeffM

    JeffM Guest

    Motel room inspection lights.
  7. I was going to suggest temporary tattoos. Colors are a small
    problem of pain, but...
  8. Mark Haase

    Mark Haase Guest

    That's actually a good idea. The OP could build a few enclosed units and
    label them with some funny product name and sell them as novelty items.
  9. Garrett Mace

    Garrett Mace Guest

    I think you need an LED further up into the UV spectrum than the ones I've
    seen priced cheaply. Not that any definitive test data is available. I'm not
    about to be the one to shout "hey it works!" and allow questions to brew in
    people's minds.
  10. Charles Jean

    Charles Jean Guest

    On Sat, 11 Oct 2003 20:29:36 -0400, Keith R. Williams

    As you say, the wavelength is too high. Most fluorescent "stuff"
    requires a wavelength lower than 280 nm, some down as far as 200, in
    order to do much fluorescence. Pyrex and plastics are notorious for
    actually "absorbing* this UV range. Anybody that works in this UV
    range usually uses quartz, for its good UV transmission. I wonder if
    these "UV" LEDs are encapsulated in either glass or plastic? The
    lowest peak emission wavelengths I've seen have been about 375 nm, not
    low enough for any dramatic UV effects.

    The scorpions here in AZ fluoresce very nicely at night with a "black
    light." I would like to have a little more range than one of these
    LEDs can provide, however.

    Hey, we've got infra-red to blue. Why not REAL UV? I feel like a
    deprived child! Maybe we could start a petition to our legislative
    bodies for relief.... No, never mind, I'm OK now.

    God invented. Newton, Maxwell and Einstein were just reverse

  11. Not so. Fluorescein for example gets excited at 490 nm. 400 nm will
    probably work with those white fluorescent dyes contained in washing
    powder. Also there are fluorescent marker pens to mark property, the
    marking should be excited at this wavelength.

    In some countries bank notes are marked with a fluorescent pattern that
    can be excited at about 400 nm (to check for forgeries).

    Postage stamps are sometimes printed on fluorescent paper (from some
    German stamps there are both fluorescent and non-fluorescent versions,
    with a huge difference in value).

    Some minerals show fluorescence at relatively long wavelength.

    If you have a microscope, 400 nm LEDs could be used to make UV
    illumination to see the fluorescence of chlorophyll, and the
    auto-fluorescence of some tissues (in particular after
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