General > General Technical Chat
High power LED damage reasons
floobydust:
It's an awful failure.
The power supply might be slowww. You have to test it to really know. Although it has a fast CV spec, overload is 500msec and no specs exist for CC response time.
Some power supplies screw up at the transition from CV->CC or CC->CV, either done slowly or lots of overshoot.
Since the power supply can easily overpower the LED, I would have added a ballast resistor which can be (voltage) monitored to see if the PSU is well behaved.
I would wonder if the LED thermal (paste and screw torque) was properly done. Were you getting decent heat transfer? Looking at Vf can give a rough estimate of LED temperature.
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