Re: LED's and Ebay questions


"Chretien" <Cretian@xxxxxxx> wrote in message
news:q-OdnQXWKfP31MDfRVn-3Q@xxxxxxxxxxxxx
> 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)
> >If you don't mind waiting two weeks for the LEDs, check out
> >besthongkong on ebay. I purchased 50 ultra bright white LEDs for $8 +
> >$5 shipping, 11000mcd. They work great and you can order a 1/4w
> >resistor for each one for a penny each. The LEDs are the same specs as
> >the rip off shacks at $5 each.
>
>http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&rd=1&item=79665925
> 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.
>


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.





.

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