If you don’t mind, your pictures are showing up a little small for me. So I copied some of the important bits.
I’m interested in how you achieved such a low internal resistance, but perhaps that’s a trade secret
Internal resistance depends mostly on fet resistance,nothing magical there,the lower fet resistance,the better,but there is a point where potential gain (output current) is neglible,and that point is IMO about 5mOhm of driver internal resistance.
led4power
What about a single XML type emitter + 2S? Is it XPH35 realy?
That’s what I thought, just wan’t sure how you shaved off another 5 from the “big FET” driver. Just a newer/better FET?
Led4power was so kind to send me the LD3 prototype, but I have not had enough time yet to do a proper review. But the bottomline is that the LD3 has (almost or exact?) the same hardware as the LD2 but the UI has dramatically changed: it is clicky only now, with a wagonload of useful settings and a very well functioning configuration procedure. I like it a lot sofar!
10x djozz
great!
did i miss the price? ;)
Wait! djozz, did you say clicky only? I know a lot of lights are clicky, but sometimes a clicky just won’t do. Wonder why e-switch was left out! :cry:
Otherwise, just from reading the page that PD zoomed in, it looks to be a very worthy upgrade for LD-2! I just hope LD-2 stays available for e-switch lights, or another alternative is offered. 
EDIT: I just glanced over the preliminary datasheet, and I’m amazed at the depth of configurability and functionality of this driver! Still wish it would support e-switch, but for a clicky switch driver, I don’t think there’s one out there that compares!
@pilotdog
Note <10mohm for DD drivers,that means just that,less than 10mohm.Since there are a lot of different DD drivers and even more different FETs used,internal resistance varies from maybe 2mohm to 10mohm,but most of them have 4-6mohm.
Sorry, I didn’t understand you?
Wow Neven nice job on this one! Configurable current setting, brilliant! I’ll take 4 please! :+1:
Well, i was always wanted an Eu source for a good drivers like yours that are suitable to drive a single XML emitter type with 2( or more) 18650s, especialy in the 17/20mm form factor cause atm we have only MNT ones
Also a good driver for XHP35 in the same form factor driven by 4 Liions
Clicky one? Good for me
COOL! UI adjusted current levels! 
I run out of ROM space in uC bacause of configurable settings. There will be e-switch version,but not sure when.
Thanks! After I saw the datasheet, I figured that was the case. This really does look to be an awesome driver! Good job! I wouldn’t have thought there would be much room for improvement after LD-2. Hardware-wise, it seems I was right, but the UI of the LD-3 is incredible!
As far as i know from LD-2 :
1)This driver is compatible with 4x Li-ions for use with xhp35
2)It isn’t a buck driver , it needs 1 cell for 3V leds , and 2 cells for 6V leds
Nice! The configurable modes and possibility to have CC in lower modes and DD in high modes is a killer feature.
So in direct drive mode it is not limited to 12A, correct? It would behave just like an ordinary DD?
There will be 4 versions of LD-3 available. 3A,6A,9A and 12Amps. DD feature on high is firmware regulation override,and there are some theoretical limits for DD current because of that,as shown in graph:
