LED's from ebay.

"Spehro Pefhany" <speffSNIP@interlogDOTyou.knowwhat> wrote in message
news:ellq80p12a87s6opvblekj7mmi9pfv4bve@4ax.com...
On Mon, 26 Apr 2004 18:16:50 GMT, the renowned "Bullwinkle Jones"
bullwinkle_01_01@hotmail.com> wrote:

I don't have a serious purpose for them, and re: white LED's they
were just an
example. I was actually just trying to get a feel for the quality of
basically
all the 'steal of a deal' LEDs on EBay. I'm thinking about buying a
bunch, and
even if 50% are bad, it's still a good deal for my purpose of
experimenting.
I'm actuallying thinking about multiplexing a bunch for an LED sign,
computer
controlled of course.

Watch the shipping charges too, sometimes they add $10 or even $20 US
for something that costs $2 to airmail, which means that the real cost
is much higher. They do this partly to catch your eye and partly to
deprive eBay of their fees, which are based on cost before shipping is
added. I see one that has $20 for first and $18 for each additional
lot..

I also have some argument with listing the "maximum" brightness (and
"typical") rather than the "minimum". ;-)

IOW, they guarantee the brightness will worse than some figure, but
not better than anything..
Click to expand...
That's exactly what happened in my case. They advertised 3000 mCd, but
that was the max further down in the fine print, and even then I believe
that to be way too optimistic, I doubt that any of them were near that
bright. They Sucked.

Later ads from the same H.K. Co. said 2500 max. It's all a matter of
what you can get away with on ebay. Lately I've been seeing a lot of
auctions for LEDs that have an additional word like Honda or another
make of car, totally unrelated to LEDs. This is called search
manipulation and keyword spamming and is a clear violation of their
regulations, and is prohibited.

Lately I've been reporting these and other violations. I've gotten
several spammers kicked off because they auctioned email lists, which is
clearly another violation of policy.

Just one thing that I'd like to see in their web pages. I wish they had
a way to filter out specific vendors. Some vendors use (or misuse!)
ebay as an advertising medium, they don't really care if they sell an
item, they just want to get the buyer to their website. The seller
usually overprices the item, usually with an excessive minimum bid. I
see more than one parts seller that have items with a minimum bid of say
9.99, and I see them continually repost the same item over and over,
with no buyers, for months at a time. I've added dozens of their items
to the keywords to delete when I search for an item.

One vendor misrepresented, IMHO, some transistors, and I emailed him and
told him that I thought so. But they insisted they were correct. The
transistor was marked 1039-3, but they insist that it is a 2N1039, but I
believe that any JEDEC registered part would not be marked without the
2N before the number. If anything, I hope others see this clearly
inappropriate claim, and take this as an indication of a seller that is
either clueless, or at worst, a seller that the buyer should _not_ do
business with. Buyer beware!


Best regards,
Spehro Pefhany
--
Click to expand...
 
"John Miller" <me@privacy.net> wrote in message
news:c6h771$1n9$1@n4vu.com...
Spehro Pefhany wrote:
The low price is for
Pakistan, India etc. and the parts contain many fallouts and other
floor-sweepings. The third-world buyers don't mind sorting through
them to save a bit of money. Maybe they are like some hobbyists! ;-)

Lots of us who are slingin' solder in retirement don't mind it a bit,
either
(now that the company is no longer buying the parts).

What's today's closest equivalent to Poly-Packs?
Click to expand...
There are many surplus places online, among them MPJA.com, electronic
goldmine, All Electronics, Mendenhall etc. Is Jameco still around? I
haven't bought anything from them since the '80s because they were
clueless, and couldn't get the sales tax correct, trying to dun me for
the difference in Calif sales tax between where I live and the Bay Area,
S.F. I ignored their nonsense, applying exactly what their magazine ads
said to do. Idiots.

I never bought any Poly Paks(sp?) I thought they were too junky, and
over priced. Looking back, tho, I bought a lot of stuff from local
shops that were also too junky and overpriced. So over the years, I got
my fair share of crap.
;-(

--
John Miller
Email address: domain, n4vu.com; username, jsm
Click to expand...
 
On Tue, 27 Apr 2004 04:57:42 -0700, in
alt.binaries.schematics.electronic you wrote:

That's exactly what happened in my case. They advertised 3000 mCd, but
that was the max further down in the fine print, and even then I believe
that to be way too optimistic, I doubt that any of them were near that
bright. They Sucked.

Later ads from the same H.K. Co. said 2500 max.
Click to expand...
Ha. Even duds will meet that spec. ;-) They don't even need two leads.

It's all a matter of
what you can get away with on ebay. Lately I've been seeing a lot of
auctions for LEDs that have an additional word like Honda or another
make of car, totally unrelated to LEDs. This is called search
manipulation and keyword spamming and is a clear violation of their
regulations, and is prohibited.

Lately I've been reporting these and other violations. I've gotten
several spammers kicked off because they auctioned email lists, which is
clearly another violation of policy.
Click to expand...
Good for you. Otherwise it just ruins the marketplace.

Just one thing that I'd like to see in their web pages. I wish they had
a way to filter out specific vendors. Some vendors use (or misuse!)
ebay as an advertising medium, they don't really care if they sell an
item, they just want to get the buyer to their website. The seller
usually overprices the item, usually with an excessive minimum bid. I
see more than one parts seller that have items with a minimum bid of say
9.99, and I see them continually repost the same item over and over,
with no buyers, for months at a time. I've added dozens of their items
to the keywords to delete when I search for an item.
Click to expand...
Interesting. Sellers have a way of blocking buyers from bidding, but
buyers have no way of blocking sellers from their searches. That would
be a good feature. I'm not sure eBay would see it that way, but they
should.

One vendor misrepresented, IMHO, some transistors, and I emailed him and
told him that I thought so. But they insisted they were correct. The
transistor was marked 1039-3, but they insist that it is a 2N1039, but I
believe that any JEDEC registered part would not be marked without the
2N before the number. If anything, I hope others see this clearly
inappropriate claim, and take this as an indication of a seller that is
either clueless, or at worst, a seller that the buyer should _not_ do
business with. Buyer beware!
Click to expand...
Yes, and feedback is not always reliable. You can assume that if there
are a few roaches, there are probably a lot more. OTOH, there are
unscrupulous buyers (more in some categories of goods than others) who
attempt to hold sellers with a good record to ransom. A few (1-2%
negs) is okay IMO, some people are just pr*cks.

Best regards,
Spehro Pefhany
--
"it's the network..." "The Journey is the reward"
speff@interlog.com Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog Info for designers: http://www.speff.com
 
"Spehro Pefhany" <speffSNIP@interlogDOTyou.knowwhat> wrote in message
news:v7ks801332vq7i5pe37gh9ddbijh5llih7@4ax.com...

[snip]

One vendor misrepresented, IMHO, some transistors, and I emailed him
and
told him that I thought so. But they insisted they were correct.
The
transistor was marked 1039-3, but they insist that it is a 2N1039,
but I
believe that any JEDEC registered part would not be marked without
the
2N before the number. If anything, I hope others see this clearly
inappropriate claim, and take this as an indication of a seller that
is
either clueless, or at worst, a seller that the buyer should _not_ do
business with. Buyer beware!

Yes, and feedback is not always reliable. You can assume that if there
are a few roaches, there are probably a lot more. OTOH, there are
unscrupulous buyers (more in some categories of goods than others) who
attempt to hold sellers with a good record to ransom. A few (1-2%
negs) is okay IMO, some people are just pr*cks.
Click to expand...
I read in some forum that a buyer should _run_, not walk, away from any
seller that has less than 98% neg fdbk. But I've done biz with a local
seller that has 97.something%, however I go there and pick up the
package and pay for it in person, so I know who I'm dealing with.
However I've beeen buying $50 pieces of old test equipment from them,
not a $1000 HP sig gen or whatever. If I were going to spend that much,
I might have second thoughts about dealing with them.

Feedback is something else. One local guy I've dealt with seems
friendly and likeable. I went over and picked up some parts from him
and paid in cash. But he got four neg fdbks from some non-paying buyer
after the buyer got shipped overseas (military?) and didn't pay after
months. When he, the seller, posted neg fdbk, the non-payer retaliated
and posted four negs. Otherwise, this seller's record is clean. It
takes only a few retaliatories to foul up an otherwise decent seller.
So go in and read the neg fdbks before you make a decision that the
seller's a flake.

So far I've posted one neutral fdbk, seller packaged the item without
_any_ padding and it got broken in shipment, or else he may not have
revealed all the deficiencies in the item during the auction, so I
shipped it back and got most of it refunded. In either case, he claimed
I was having "buyer's remorse" and I retorted, not buyer's remorse, but
buyer beware!

And always "do your homework" before you bid, or you will be
disappointed!

Best regards,
Spehro Pefhany
--
Click to expand...
 
John Miller wrote:
Spehro Pefhany wrote:
The low price is for
Pakistan, India etc. and the parts contain many fallouts and other
floor-sweepings. The third-world buyers don't mind sorting through
them to save a bit of money. Maybe they are like some hobbyists! ;-)

Lots of us who are slingin' solder in retirement don't mind it a bit, either
(now that the company is no longer buying the parts).

What's today's closest equivalent to Poly-Packs?
Click to expand...
Umm... Radio Shack. You are referring to quality?

--
Jerry wa2rkn no email @ present
 
Jerry Koniecki wrote:
John Miller wrote:
What's today's closest equivalent to Poly-Packs?

Umm... Radio Shack. You are referring to quality?
Click to expand...
Heh. No, price and range of product. When it comes to components, today's
Radio Shack doesn't have much selection or bargain prices, but their
quality is O.K.

--
John Miller
Email address: domain, n4vu.com; username, jsm

Emerson's Law of Contrariness:
Our chief want in life is somebody who shall make us do what we
can. Having found them, we shall then hate them for it.
 
Though this doesn't have anything to do with ebay the prices of LEDs
are astoundingly cheap. I remember my Dad bringing home some when they
were just becoming available. I think it was 1969. Anyway, they were
in these nice gold plated packages with a glass lens and were quite
dim compared to the ones made today. And the size of the point of
light was also quite small. The ones I was shown were worth about
$100.00 each. In 1969 dollars. Now, we have LED lasers! And you can
get 'em for less than 5 bucks in a nice package batteries included.
ERS
 
"Eric R Snow" <etpm@whidbey.com> wrote in message
news:3po09050mgcjgfdqjlr8h2m4n4b9ri2lc9@4ax.com...
Though this doesn't have anything to do with ebay the prices of LEDs
are astoundingly cheap. I remember my Dad bringing home some when they
were just becoming available. I think it was 1969. Anyway, they were
in these nice gold plated packages with a glass lens and were quite
dim compared to the ones made today. And the size of the point of
light was also quite small. The ones I was shown were worth about
$100.00 each. In 1969 dollars. Now, we have LED lasers! And you can
get 'em for less than 5 bucks in a nice package batteries included.
ERS
Click to expand...
You've made a good point. Prices have come down dramatically. But at
that time, the LEDs being made were only bright enough for indicators,
panel lamps, dials, etc. There was no market for LEDs for illumination.
Now that there are LEDs that have a thousand times more candelas
brightness, they can be used for a whole new field of use, such as
flashlights, task lights, etc. To get the needed illumination, these
lights have to use multiple LEDs, and that means that the total cost of
those LEDs has to come down to the point where they are competitive with
other forms of lighting. That competition won't happen when LEDs are
each a dollar or more, and they must use a dozen or more LEDs per lamp.
The competition, incandescents, might cost a dollar or less for the same
amount of light.

So as demand for larger quantities and market pressure push LED prices
lower, more of them will be used for special lighting applications that
now use incandescents. It takes time, tho. LED flashlights were a lot
more expensive a few years ago, and now have dropped substantially. But
they use only a few LEDs; lighting might use dozens.


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