XR-E R2 the die is smaller, so you get a tighter hot spot with less total lumens output. XML produces more lumens but the hot spot becomes huge compared to the XR-E. For even greater throw with the XR-E, you can replace the driver with a 1400ma amc7135 driver with your choice of modes or just a single mode. If you had a copper pill made for the light the current and throw might be increased even further. how hard can i drive an xr-e emitter?
Output to expect with current increase. Results: Testing XM-L, MC-E, SST-50, and XP-G emitters **Updated**
Copper I’m sure would exceed these numbers a little.
.
The one I got from DX a couple of years ago (2-mode) had a off,on,on switch, where the first on was tied to a resistor (Low mode) to limit current. You will need to replace the switch with a on,off version if yours comes that way. Mine came pulling less than 1 amp factory. There so many copies now its hard to tell what you will end up with.