Post by thread:[EE] Where to get RGB high power LEDs.

I'm looking for a high power LED like a Luxeon III that has red green and blue dies in a single emitter unit. Does anyone know where I can get something like this? Ideally, it should be able to output at least 70-80 lumens of white with all 3 colors on comparable to a white Luxeon III. The only referrence to such a device that I can find is here: http://wonderful-hk.en.alibaba.com/product/50144037/50664814/Xeon_High_Power_LEDs/RGB_High_Power_LED.html and they seem to be a business to business site that will want to know how many shipping containers of them I want :) Thanks, Jason

On May 20, 2006, at 12:07 AM, Jason wrote: > I'm looking for a high power LED like a Luxeon III that has red green > and blue dies in a single emitter unit. Does anyone know where I can > get something like this? eBay has become a direct retail outlet for a bunch of chinese LED manufacturers: http://cgi.ebay.com/1P-Prolight-3W-High-Power-RGB-LED-Full-Color-PG1L -3LFS_W0QQitemZ7621013046QQcategoryZ66952QQrdZ1QQcmdZViewItem IIRC, this vendor has a reasonably good reputation... BillW

That's perfect, thanks. Jason ----- Original Message ----- From: "William Chops Westfield" <spam_OUTwestfwTakeThisOuTmac.com> To: "Microcontroller discussion list - Public." <.....piclistKILLspam@spam@mit.edu> Sent: Saturday, May 20, 2006 1:09 AM Subject: Re: [EE] Where to get RGB high power LEDs. {Quote hidden}> > On May 20, 2006, at 12:07 AM, Jason wrote: > >> I'm looking for a high power LED like a Luxeon III that has red green >> and blue dies in a single emitter unit. Does anyone know where I can >> get something like this? > > eBay has become a direct retail outlet for a bunch of chinese LED > manufacturers: > > http://cgi.ebay.com/1P-Prolight-3W-High-Power-RGB-LED-Full-Color-PG1L > -3LFS_W0QQitemZ7621013046QQcategoryZ66952QQrdZ1QQcmdZViewItem > > IIRC, this vendor has a reasonably good reputation... > > BillW > --

On Sat, May 20, 2006 at 01:09:18AM -0700, William Chops Westfield wrote: > > On May 20, 2006, at 12:07 AM, Jason wrote: > > > I'm looking for a high power LED like a Luxeon III that has red green > > and blue dies in a single emitter unit. Does anyone know where I can > > get something like this? > > eBay has become a direct retail outlet for a bunch of chinese LED > manufacturers: > > http://cgi.ebay.com/1P-Prolight-3W-High-Power-RGB-LED-Full-Color-PG1L > -3LFS_W0QQitemZ7621013046QQcategoryZ66952QQrdZ1QQcmdZViewItem > > IIRC, this vendor has a reasonably good reputation... On that note... Be carefull. I've bought about 3000 LEDs of various types from cwithk on ebay. Of those many have the polatity markings on the epoxy case, the flat side, different than the longer lead marking. In a batch of 1700 flashing RED leds I once ordered and installed by hand about %1 had this defect. Didn't cause me any problems, but automated equipment might be a different story. Another batch of 100 high intensity blue LEDs worked fine to produce light. But the reverse current leakage was completely unacceptable for use in an LED matrix. Around %5 of the LEDs would light up fine, but they just were not acting as diodes, as much current would flow in the reverse direction, without producing any light. They also seemed to fail progressively over the course of a few days of testing. This was at proper votlage levels with a current limiting power supply and before I had even hooked up any other circuitry, just the power supply connected via clips. Of course, in both cases, the LEDs were at a very reasonable price. :) For the flashing LEDs they were simply the only place I could find LEDs that I could afford. cwithk was a tenth of any other price I could find. I will be buying more in the future from them all the same. -- peteKILLspampetertodd.ca http://www.petertodd.ca

I've ordered about 500 LEDs from cwithk. I haven't seen any with strange polarity markings. The high intensity blues are the only ones I've used extensively, and they seem to have about 5% that light up a deeper blue and not as bright as the others and another 5% are doa or fail within the first few hours. Overall, it's worth it for their very low price but I know what you mean. For a single $14 LED like we were talking about, I'd be very upset if there's problems with it. {Quote hidden}> On that note... Be carefull. I've bought about 3000 LEDs of various > types from cwithk on ebay. Of those many have the polatity markings on > the epoxy case, the flat side, different than the longer lead marking. > In a batch of 1700 flashing RED leds I once ordered and installed by > hand about %1 had this defect. Didn't cause me any problems, but > automated equipment might be a different story. > > Another batch of 100 high intensity blue LEDs worked fine to produce > light. But the reverse current leakage was completely unacceptable for > use in an LED matrix. Around %5 of the LEDs would light up fine, but > they just were not acting as diodes, as much current would flow in the > reverse direction, without producing any light. They also seemed to fail > progressively over the course of a few days of testing. This was at > proper votlage levels with a current limiting power supply and before I > had even hooked up any other circuitry, just the power supply connected > via clips. > > Of course, in both cases, the LEDs were at a very reasonable price. :) > For the flashing LEDs they were simply the only place I could find LEDs > that I could afford. cwithk was a tenth of any other price I could find. > I will be buying more in the future from them all the same.