Not proven. Street lights in all Chinese cities are LED's from locals,Taiwan and Korea. They are very competitive.
LED's are used extensively and heavily in the East (where is the East?) and no one has complained of the bulbs being defective. NO one has complained? How do you know that- do you work for the Chinese Citizen Consumer Protection - CCCP? People ARE COMPLAINING here in the US. Is there a secret that we don't already know here? The problem with the Chinese and Taiwanese bulbs is they have tried to copy the manufacturing processes that Cree perfected. Cree spent 20+ years just perfecting the process to make the substrate that the LED reflects light off. That is a very important element in these lights.