How hard can a U3, 1C be driven on a 25mm base, large copper (brass) pill

Any suggestions for a build using a 25mm round MCPCB , and needing a 20mm circuit board?

I’m driving a u3 1c at 3.7a, its on an ally PCB in a keygos m10, no long run times on high yet, but I’m confident it’ll be ok, its well heat sinked and secure.

If you or anyone replies, please include a link to the driver source if you can — thanks…and the circuit board suggested…

I’m using the 4 mode group version of this driver

http://www.intl-outdoor.com/4a-3mode-2745v-circuit-board-p-546.html

Just ask them upon ordering, it seems to give 3.7a,

And this led

http://www.intl-outdoor.com/cree-xml-u3-1c-led-16mm-mcpcb-p-593.html