In the past year I've bought several LEDs - 2 x 7W dimmable PAR 30s, 2 X 5W and 1 x 7W from Chinese suppliers on ebay. Of those, the failure rate is now ~75%. Never again.
I have others I bought from more reputable sources and with proper warranties - they're still going fine, so far; although they were three to four times the cost, if they actually last the expected/claimed lifetime, the cost will be trivial.
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