Originally Posted by
Wiggle
I think output wise, the MC-E is going to be pretty much identical to the P7 for most cases, but the P7 can be pushed a little harder. The MC-E does have a couple features that make it more useful in some applications (such as individually accessible dies).
The MC-E available at DX uses a parallel connected board but Cree shows a series connected board as well. That one would work perfectly for a dynamo driven light. The Cree MC-E emitter dome is the same size as the XR-E so standard single die optics will work just fine. From the Lumen/current chart a dynamo driven series connected MC-E should be around 500 lumen with a standard 6-volt 3-watt (500mA) dynamo using Martins 4 LED circuit. I sure hope DX makes them available. They should as nominal driving voltage for battery applications of series connected MC-E LED's would be 14.8 volts, perfect for automotive applications.