xml2 current question

LED Flashlights – General Info 18650 Flashlights
1

Hi all,
I would like some advice regarding an optimum current level to drive an xml2 at?( On copper)

From the little I have read it seems there isn’t much point in driving an xml2 led in a 1cell li-ion light at much over 4A, due to the forward voltage needed…. ( It will not be long before voltage drops too low…. Please correct me if I’m wrong)

I would like to mod my zyt08, which is different from a 1 cell light, so it could be more beneficial to drive it harder than 4A, but I’m just wondering how much harder to go?
Looking at Match’s results of an xml2 on copper, it seems it can go to around 6A and still get more lumens, but I am wondering if it’s definitely worthwhile to try go that high, or should I leave it at around 4-5A.( I will be stacking chips on a nanjg….)

Any input will be appreciated, thanks!
Anton

2

6A is a nice current for a XM-L2, some go even go up to 8A. On copper the lumens keep going up right to the point where the bond wires burn (~9A).

I agree that with a single li-ion going higher than 4 (maybe 5) is not usefull, within minutes you're back at under 4A anyway.

3

Wow, 6A, that’s a bit higher than I was thinking…. Cool….
Is there perhaps another driver you would then recommend, that might be a few too many 7135 chips to stack…. Or not, I guess I could manage it….
Thanks

4

Around 5.5/6A is the sweet spot, high enough, but not too hot, and still manageable heat.