For 3 cell in series you'll need 375kohm 0402 resistor,instead of 750kohm(2S parts consist of 1 op-amp and two 750k 0402 resistors).I don't have 375kohm value,but you can stack two 750k in parallel.
Based on reports from blf members, you shouldn't worry about blowing new xm-l2 with single cell,because they have very high Vf.I see i forgot to add equation for max. current set resistor:
Rx[kOhm]=900/Imax[A]
For example,stock value for 6A is 150k,for 5A you need 180k resistor.
Can i use this driver for a tripple, the LD-1 was single emitter only right ?.
This is a very good question, can we use this for triples & quads? And what max amp do we get then with high drain battery & XM-L2 class emitters?
And is 6A really the max for a single emitter? what if we use a lower ohm resistor than 150k?
What I understand is that you can set the resistor for higher amps (if battery/flashlight/emitter allows that).
on a side note:
The 'triple question' also emerged for the LD1, but I do not really understand this type of driver for triples (unless you have severe emotional problems with PWM):
*each emitter in a triple will typically receive only moderate current, say 3A, then the efficiency improvement of this driver at lower modes, compared to a PWM-ed direct driver, will be considerably less than with using a single emitter at 6A.
*at the high setting in a triple I would not want to limit the current, I want my leds to receive all the current they can get and turn it into light, the emitters will not be at their maximum performance anyway (but this is of course quite a BLF-point-of-view ;-) )
For a triple I would go for a BLF-DD driver, I would not even bother using a FET+7135 driver for the same reason as above.
(sorry, this should have been in a discussion thread)
It is my opinion, and only my opinion, that you’re wrong about the decrease in extra efficiency of this driver comparing a triple with this driver to a triple using a PWM’d driver, versus the same two drivers with a single emitter each. Isn’t it true that emitters become increasingly efficient at lower and lower currents? So, the difference in efficiency from 6A to 3A is less than the difference from 3A to 1A, isn’t it? Or am I the one who is reading the PCT wrong? I see for instance, the XHP-70 at 4A (the highest the PCT goes) has an efficiency of 136 lumens per watt. The change in efficiency from 4A to 3A is 14 lm/w to 150 lm/w total. The change from 3A to 2A is 17.2 lm/w, and the change from 2A to 1A is 22.5 lm/w. So, the lower you go, the faster the gains stack up. This is all on top of the fact that the Vf goes down, which should give us better regulation to lower levels, and better run-time. Right? Or, am I missing something? Be kind, I’m still a newbie. 
As for using a FET, that would make sense coming from your perspective of wanting all you can get from each emitter. Obviously, any driver that has an inherent max top end that is a lot lower than the top end of the emitter will not be suitable to reach that goal. But, maybe that isn’t everyone’s goal, even though we are on BLF! 
Reply to djozz……
So are you saying that in a triple we can get max 9 amp from the LD-2?
Personally i really like the idea of non PWM modes, and if there are efficiency gains to be had at the lower modes why not get them.
3 Amp per emitter should get about 3000 lumens or so, i don’t think my current X6 triple does very much more, maybe 3300-3500 tops.
Most of the time in house i use the triple on the lower modes, and yes of course i want the max it can do on turbo when i need it.
But the question is how much do we lose and how hi can we go.
I know the LD-1 couldn’t at all without severe mods, so how much can the LD-2 do if we lower the resistor so we get as much amp in a triple or quad as we can get, or will it get to hot in the middle modes like the LD-1.
You can use it for triple,if you ensure good enough thermal path between driver and body.Until I edit info thread(have some problems with that),you should check .docx document https://budgetlightforum.com/t/-/33706, post #14.
From that document you can see that with typical flashlight pill filled with silicone cubes only,you can drive triple xp-g2 at 9A without problems.Replacing part of those silicone cubes with metal as "filler" ,thermal performance should be even better for more extreme builds.
Also you can check djozz' build thread with mt-g2 and LD-2 prototype,he pretty much did a torture test and LD-2 survived.
Driver doesn't know how many leds you connect to its output,practical limitation is heat generated in driver;how to calculate that,you can find in info thread.
With LD-2 you can get practically identical current on max. like with DD drivers,check djozz' LD-2 prototype test and comparison of currents vs. DD driver. The important difference is that LD-2 will limit current when it reaches 6Amp. You can change 150k resistor if you want higher current,but with typical cree xm-l2,xp-l 6Amps is usually max. possible current with 1x cell (ok,maybe you could achieve 6.5-7Amps,but only for a few seconds,and gain is minimal).
led4power, I just wanted to be the first person to thank you for making this possible.
Prices are very fair imo. Someone like rmm or the others could get maybe 100 at a time and offer them to us for around the same price his other drivers are.
I absolutely loved the five LD-1 drivers I purchased off you before. I’m looking forward to trying these new LD-2 drivers. Your design looks impressive. Just trying to figure out how I can get five of those sweet drivers. I hope Richard of Mountain Electronics carries them as well. By the way, it is folks like you that make the BLF a very special place! Keep up the great work, cheers! 
Ok,ok;I'll reduce min. quantity for rest of the World to just 4pcs,better now?
And thanks for the support.
Moved GB to separate thread to stir up more trouble interest.
You do quality work, no doubt about it. I’ll be ordering some soon.
If the driver works in the X6 I would.
Wow, led4power, you are being more than fair. Thanks again for making this driver, and for making it easier for us to get by lowering the MOQ.
I’m in for 2 drivers, if someone is still interested in a US group buy. If not, I’ll end up ordering 2 in the couple of days.
I offered already to do the US group buy if nobody else steps up. But, I’ve also been waiting to see if Richard will carry some of these in his store, because that would be much better. I think, if we end up going the GB route, we will need to reach 100+ drivers in order to get the best price, to cover re-shipping from the GB host (me, if nobody else does) to each individual purchaser. Maybe 50+ pieces would be enough for that. But, in case you missed it, the MOQ was reduced to 4 pieces for anyone outside the EU. That’s probably low enough for most people interested, although the price will be higher than what we can get with a 100+ GB.
Put me down for 1, if there is a GB.
Waiting to see how this shakes out for US buyers. Would want two to four depending on price. Hopefully, the price will show a modest discount from the qty. one price.
Reading, its not for everyone.
MOQ of 4 is the same amount as was for the LD1, and they sold out quickly.
Post #51 has US GB list.