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LED's and Ebay questions

Discussion in 'Electronic Basics' started by Lord Garth, Apr 13, 2005.

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  1. Lord Garth

    Lord Garth Guest


    Others here have noted that the brightness drops rapidly if these LEDs are
    run
    near their maximum as compared to first quality / expensive LEDs. You
    should probably derate them by 50%. You can add more LEDs for more light
    output. The heat from soldering could be a problem too so use a heat sink
    and
    be quick about the task. You don't say how you are going to power the LEDs
    or if there are any reflectors involved.

    The brightness drops as you increase the viewing angle.
     
  2. Chretien

    Chretien Guest

    A little while ago someone had said that they had bought 50 LED's from ebay
    and provided a link to the item. The price was really cheap 8 dollars plus
    shipping 5 dollars. That is a real deal.

    (here is the message)
    95&category=33713


    Unfortunately the item had expired. After some searching I found another
    sale which appears to be the same thing.
    The company besthongkong.com seems to have has many,many,many LED's listed
    on ebay or on their site. I am NOT an ebay person so have never dealt with
    it and have a couple of questions about the LED's for my project and buying
    on ebay.

    I want to make a couple of night lights for the cottage pathway. Sure I
    could buy those cheesy path lights but what would be the fun in that.

    My questions are :
    1. ebay lists "50 11000mcd Ultra Bright White LED Hot! LEDs Light" Are these
    small LED's the type you would use in a small circuit. Would they be right
    for this for this project ?? Or are they simply too small to really provide
    enough light?

    http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=66952&item=7508025261

    2. I'm not sure what the viewing angle means. These above are 20. It appears
    that most are 20.

    3. I have also seen from this same company the below LED. It has a MCD of
    20000. Unfortunately they only seem to sell them in quantities of 100. I
    cant tell if they are 5mm or not. Its not clear to me. Are these better than
    the ones above. They seem to have almost twice the brightness ?
    http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=66952&item=7508019489


    4. I see that the company has jumbo LED's maybe that what I should use. They
    are 12V. But I can't see how much light they give out.
    http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=7967991061&category=33713
    10 White LED Wedge Base Bulb 194 158 168 Light LEDs

    Sadly the shipping is more than the bulbs, not sure why. 10 of the bigger
    LEDS must weigh less than the 50 of the smaller. Anyway would this be a
    better solution? The only thing is they seem to have a base on them, This is
    yet something else I would have to get, and deal with.


    5. What is the best way to buy things on ebay. Is this paypal free, and the
    best way to go. Any suggestions. or even any better place to get cheap
    LED's.
     
  3. Lord Garth

    Lord Garth Guest


    Yep! Do not expect top performance from a bargain bin. Learn to recognize
    what I call "sales speak" which is often the art of verbosely saying
    nothing.
     
  4. Lord Garth

    Lord Garth Guest


    I think you've answered your own question! If you want the best quality, go
    to the
    manufacturer. They don't want their name associated with crap so they don't
    sell
    it themselves.

    The bulk vendors buy parametric failures, functional but they don't meet
    spec. There
    is no telling what specifications were failed. Often, these are fine for
    non critical or
    hobbyist use.

    The bulk vendors buy these because they maximize their profit in this way.
     
  5. Chretien

    Chretien Guest

    Others here have noted that the brightness drops rapidly if these LEDs are
    What you are saying is that these LEDS are not the best quality and may not
    produce the desired result.
     
  6. Chretien

    Chretien Guest

    Others here have noted that the brightness drops rapidly if these LEDs are
    How do you know when you buy LED's that they have not simply bought the same
    one's Im looking at and are reselling them.
    How do you know they are good quality? Generally they are in their some
    packaging which does not identify really who made them. BestHongKong most
    likely does what everyone else does. Goes to manufacturers and says I need 1
    Million LEDS what the price. Then packages them up. Who knows who makes them
    ??

    Regards
    Chretien
     
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