Convoy S2 XD16 build with DIY MCPCB Fail

[EasyB]

In my experience the XD16 has underwhelming efficiency, output, and luminance.

Cree XD16 measurements

I was pretty excited about this LED and the possibility of making customized multi-die emitters. I ordered some from Arrow electronics. Part number: XD16AWT-H0-0000-00000BJE3. Should be S2 flux bin. I measured the output, forward voltage, and resulting intensity in a flashlight. I made a makeshift MCPCB out of 1.6mm thick copper. I glued two pieces of the copper together with JB weld so that there was a small gap. To electrically isolate the two pieces from the shelf I used a couple thin strips…

The 2mm white flat actually is pretty efficient when it’s not overdriven too much, and has similar size to the XD16.