<div id="RTEContent">I jst bought some white LEDs from a well-known<br> surplus dealer. Maybe 30% of them were defective.<br> The bad ones did not light up... and had a forward drop of only<br> 1.6V instead of the normal 3.5V (or so). Probably, they<br> are static damaged. Beware !!!<br> <br> I will work it out with the retailer (they are reputable) but I got<br> way less yield than I needed...<br> <br> H^) harry<br><br><b><i>clark@andrews.edu</i></b> wrote:<blockquote class="replbq" style="border-left: 2px solid rgb(16, 16, 255); margin-left: 5px; padding-left: 5px;"> <br>> Be careful with the Hong Kong sellers... many are probably reliable, but I<br>> won & paid for a batch of Red/Blue bicolor LEDs from the seller "*<br>> spectrumleds*<http: //feedback.ebay.com/ws/ebayisapi.dll?viewfeedback&userid="spectrumleds&item=7574969754&iid=7574969754&frm=1883&ssPageName=STRK:MEWN:SID">"<br>> 23 days ago and have had no communica!
tion and
no LEDs so far... waiting<br>> for<br>> a reply to my "contact this seller" attempt, but suspecting that the money<br>> is gone and I will need to try again. No point complaining to Baywatch,<br>> as<br>> they don't care the tiniest bit about ripped-off buyers as long as they<br>> get<br>> their cut of the take.<br>> As always check feedback and seller's history... happy hunting<br>><br>> On 1/15/06, Colin Raffel <colin @experimentalistsanonymous.com=""> wrote:<br>>><br>>> Check eBay. There are lots of sellers from Hong Kong who sell white<br>>> LEDs for cheaper, they just have fairly high shipping prices.<br>>><br>>> Here are some for 19c apiece shipped, a tiny bit cheaper...<br>>><br>>> http://cgi.ebay.com/New-100-Mega-Bright-10000mcd-3MM-White-LED-Free-<br>>> R_W0QQitemZ7580316357QQcategoryZ66952QQrdZ1QQcmdZViewItem<br>>><br>>> Wrong size....<br>>><br>>>
http://cgi.ebay.com/Lot-of-100x-Ultra-Bright-White-LEDs-5mm-<br>>> dia_W0QQitemZ7579578236QQcategoryZ66954QQrdZ1QQcmdZViewItem<br>>><br>>> Give it a try.<br>>><br>>> -Colin<br>>><br>>><br>>> On Jan 14, 2006, at 1:21 PM, xamboldt wrote:<br>>><br>>> > Anyone know a good source for relatively cheap white LEDs? The best<br>>> > I found was $0.20 for 3mm here:<br>>> > http://www.rjmods.com/product_info.php?products_id=90<br>>> ><br>>> > But this seems so much cheaper than every place else (around $1.00/<br>>> > each for the cheapest), it seems kind of fishy. Has anyone heard of<br>>> > rjmods before?<br><br> Hi Chris,<br><br> I'd be very wary of cheap white LEDs. Of course my concern is largely<br>centered around two issues:<br><br> 1) White "color"<br> 2) Color matching between LEDs.<br><br> Most "white" LEDs that I've seen are really a "blue" color, s!
ome
so<br>significantly so that I don't know why they don't sell them as "light<br>blue" LEDs and not "white". Getting a more neutral (or warm) colored<br>white is difficult and not many suppliers carry them.<br> I've gotten some nice warm white LEDs from this company:<br><br> http://www.ledtronics.com<br><br> They aren't cheap, but again, it's very hard to come by true warm white<br>LEDs.<br><br> The second issue, color matching is pretty critical if you are going to<br>have more than one or two of these LEDs together. My company has a<br>product which is lit by yellow LEDs. We initially went with some of<br>the cheapest LEDs we could get our hands on, only to find out that the<br>manufacturer doesn't bin-sort the LEDs according to color. So we'd<br>have some which were a lemon-yellow and some that were almost a dark<br>orange!<br> So I went back through various supplier data sheets until I found one<br>from Agilent which are bin-sorted for color. These were alm!
ost
as<br>cheap as the ones we'd been using but dead-on accurate in color.<br><br> So, just be aware that a 20 cent white LED may not get you what you<br>really want...<br><br> Good luck!<br><br> Tony<br>-----------------------------------------------------------------------<br> Great Lakes Modular<br><br> Custom Design, Engineering, and Manufacturing Services<br> www.greatlakesmodular.com<br>-----------------------------------------------------------------------<br><br><br></colin></http:></blockquote><br></div>