ImA4Wheelr
(ImA4Wheelr)
4
This is a really nice time for you to upgrade your light. It would be nice to know what failed first though. It could just be the switch. If that light has a tail switch, you can remove the tail cap and use a paper clip or piece of metal to connect the back of the battery holder to the bare aluminium at the back of the battery tube. Also, you want to make sure the batter holder is not broken. Do you have a DMM? If you do, you can check the voltage of the carrier to make sure it's connections are still good. You can also use your DMM to test the emitter to see still if it still works. If i doesn't work as you suspect, you may still have a good driver.
Most likely, that light will fit an 18650 type cell if you want to really upgrade the power side of the equation. Just wrap some cardboard around the cell so that it doesn't rattle. An 26650 cell may even fit. I think the driver may be direct drive ("DD") on that light. So if you do power the light with a Lithium Ion type cell, you will need an emitter that is on a copper base.
The emitter is where you can really upgrade the light. You say the light has an XP-G2. That emitter is 3.5mm square in size. I would recommend you stick with that size emitter so that you don't have to modify the reflector or isolation ring that goes between the reflector and the emitter base. Kaidomain has a nice selection of emitters already on 20mm bases. The 3 volt emitters that are 3.5mm square XP-L, XP-L2, XP-G, XP-G2, XP-G3, SST20, 219C. Personally I would go with the SST20 at 3K or 4K tint. You will get very high color rendition (CRI >95) and a wonderful tint as the cost of some output. I you are looking for max output, I would think you would want to go XP-L2.
User interface and really make a light special. If you want to change that, you will want to consider a driver swap. We would need to know what size driver that light has if you want some recommendations on the driver. Also, does that light have a side-switch, or just a tail switch?
Best wishes on you mod. I really like those LuxPro lights.