Over-baked xpg?

I have just reflowed an xpg onto a piece of copper and noticed that its Vf has increased by 0.3V. I chose the led from a batch of ten because of its extra-low Vf, now it is no better than the others……ho hum……

Did i over do the heat or is this normal after reflowing?

Woody

wrong Vf reading before and now you get correct Vf readings :slight_smile:

how you cheack LED Vf ?

if you drive LED without heat sinked when testing, LED heat up rapidly and drop Vf.

Think I must have been a little generous with the heat, reflowed another with no drastic change in Vf yippee!
Don’t normally check stuff like that, if the led lights up… job done. Might have to invest in a thermometer :wink:

Woody