I moved this post over from the Cheap Chinese lamp thread so the discussion would not pull the other thread off topic.
For the heck of it I looked up the info on the so called "fake Cree" LED's made by Latticebright ( Chinese company ). The data available on their XM-L2 clone ( known as the XM ) is limited. There is no dedicated data sheet like Cree but there is some information. Anyway I compared what info there is to the Cree XM-L2 data sheets and here's what I came up with...
Comparing at 700ma, 85°C...Minimum expectations ( cool white? ) U2;
Cree XM-L2 U2....300 lumen
Chinese Latticebright XM ( bin unknown )....240 lumen ( typical is listed as 300 lumen )
Cree did not list a typical output at this level although likely it is somewhere around 350-360 lumen.
I'm not saying I would want a lamp made with the Chinese LED's but the tech behind the Chinese LED's is not too far behind the Cree LED's. Actually it wouldn't surprise me if Cree tried to buy the Chinese company just so there is no confusion in the market place between the two. Heck, they now have Chinese Kentucky Fried Chicken, why not a Chinese Cree.