>-----Original Message-----
>From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] 
>On Behalf Of Attila Muhi
>Sent: 10 November 2004 16:01
>To: Microcontroller discussion list - Public.
>Subject: [EE]: LED liftetime
>
>
>Hi list,
>
>I need a monochrome (almost)  light source for a project. So 
>far I have been playing with high intensity LED:s around 650 
>nm (EL383-2SDRC), with an  output of about 3700 mcd at 20mA.  
>For some reasons I need more light than that, so I run the 
>LED:s at 50mA. This is way out of specs, which says a max fwd 
>current of 35-40mA. I also need to run the current 
>continously. I get a temp rise of course, the surface of the 
>LED goes up to 42-43 degrees. The temp rise itself is no 
>problem, but I wonder how much the overpowering affects the 
>LED:s lifetime ? 
>
>As far  as I can see, I have three alternatives:
>
>Continue as before 
>
>Finding a better LED (Any ideas ?)
>
>Use a laser.  (expensive solution)

You can get colour LED's with outputs of 20,000mcd and higher.  Have a look
at http://www.vishay.com/leds/ultra-bright/

http://ledmuseum.home.att.net/ has loads of information on current LED
technology.

Regards

Mike

=======================================================================
This e-mail is intended for the person it is addressed to only. The
information contained in it may be confidential and/or protected by
law. If you are not the intended recipient of this message, you must
not make any use of this information, or copy or show it to any
person. Please contact us immediately to tell us that you have
received this e-mail, and return the original to us. Any use,
forwarding, printing or copying of this message is strictly prohibited.
No part of this message can be considered a request for goods or
services.
=======================================================================
_______________________________________________
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist