Quote Originally Posted by DaveW
Bah, who gives a crap anymore. Now i'm going to have to breadboard the simplest LED circuits, all because of this thread. Thanks a lot guys!

-Dave (who is only kidding )
Got a variable power supply? Make a graph of V/I for an LED, Start from zero. Once it starts to light, go up in 100mV steps until you burn it out.



See how sharply the current rises once it starts?

If you have the means, measuring the light output would also be useful info.