I have no idea how the PCB got this effect.
this post was submitted on 13 Jul 2023
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Baked in it's own heat?
I was gonna say the led bulbs I’ve had exposure to get extremely hot. Might have baked the paint
Traces seem ok, maybe wicking enough heat away?
The traces can probably sustain higher heat than that paint. Besides, the hottest part is generally the LEDs themselves.