Hi Boss,
Good news here, this' the original reply from the supplier:
灯珠我们使用的都是美国普瑞芯片,3W白灯亮度达到180LM,和CREE Q5亮度差不多,性价比更高。
恒流源是国内厂家代工生产的,质量很稳定。
Basically what they said is they are using BridgeLux LED from US, they are much brighter (180LM) which equivalence to CREE Q5, and the Driver is made in china, but very stable.
Well, for those wanna know more can refer to: http://www.bridgelux.com
or,美国普瑞LED芯片的特点-原料技术-中国LED信息网: http://ledinfo.cn/Article/trends/2009-04-21/2254.html
Hope the above info helps.