Just wondering how easy it would be to swap the Cree emitter on the A19 XR-E. My A19 was one of the first batch from the Shoppe which was P2 bin and I would like to replace this with a brighter bin.
P2 to P4 won't yield enough of a perceptible increase to make it worthwhile. However, if you have a Q3 bin XR-E, then I'd say it's probably worth it. Swapping it out involves reflow soldering, and you probably will destroy the LE in the process unless you have the proper equipment.
You cant reflow solder a light engine. You may be able to heat the XR-E off and definatly epoxy a new LED on. But you may burn out the potting.
Reflowing involves heating the board while the LED is in place, think easy bake oven. Since theres epoxy potting in the LE that won't be happy at the temperature solder reflows, I say wait till the next breakthrough in LED Tech. Then buy a new light engine. I've made my own, from Downboys to FluPics, including the easy bake oven method (reflow), well actually it was on a hotplate.
Your only getting another 20 lumens from a P2 to Qx upgrade and if your using the light in the real world the only difference you'll see is a brighter low level.