> The question is, how could one characterize these LEDs to determine 
> what
> they should be driven with?



Here's where that Philips graph that I posted a ref to originally came 
from

"Understanding power LED lifetime analysis.
How intuitive graphical data sets help lighting designers accurately 
predict power LED reliability in different operating environments."


        http://www.lumileds.com/pdfs/WP12.pdf





        Russell






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