JCutter electronics are offering Q4 bin Cree XR-E from the 28th june 2007.
I guess this has to be repeated before it sinks in :
"There is no such thing like a Q4 flux bin" , not at this point in time anyway.
Keep in mind that while it will be the first Cree to exceed SSC output in lumens/amp, the Crees have generally operated at a lower foward voltage, so the current SSC and Cree LEDs are actually about the same in lumens/watt already. I think it's good that there's an improved flux bin Cree coming out. Between the two, I greatly prefer the packaging of the Cree to the SSC.Judging by the specs of the Q3 bin, the Q4 bin will be the first to match or exceed that of the SSC in terms of efficiency and maximum output.
what are ratings of Q3 vs Q4 bins?