What makes an LED “bad”?
I work at a company where they hand-solder LED leads onto wire. All the LEDs are tested before they are soldered and again after they are soldered. From a lot of 25 pieces, 8 of them do not light up under a 20mV DC power supply after they have been soldered. I’ve looked at them under a 40x microscope and the wire that connects is still intact, exactly like the LEDs that light up. I think the heat from the soldering iron (500°F) may have ruined them, but what exactly have they ruined to make 20% of the product fail and 80% of the product pass?
Heat is VERY bad for LEDs
http://en.wikipedia.org/wiki/LED_diodes#Lifetime_and_failure
You may need a heat clamp to protect the LED during soldering. Contact the manufacturer about the recommended way to handle their LEDs.
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