Attila,

These papers from Agilent may give you some insight into LED lifetimes 
under abusive operating conditions.

pulsed <http://cp.literature.agilent.com/litweb/pdf/5966-3087E.pdf> 68k
continuous <http://cp.literature.agilent.com/litweb/pdf/5967-5763E.pdf> 36k

Regards,

Dave


Attila Muhi wrote:

>Hi list,
>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 ? 
>


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