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There's a variety of reasons:

- Lower-quality components (especially capacitors) being used to meet the lower price point. This is by far the most common failure mode I have experienced, it's never the LEDs dying but the power supply.

- Higher-quality LED light is usually result of driving the LEDs harder, causing them to fail earlier.

- Probably some other reasons too.




The design may also be completely ignoring heat dissipation, and cook its components.


From what I've seen, it's usually skimping on the heatsink over the rectifier.




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