Hi,
i am searching for a Driver that can power up my XHP70 LED. The Host is a ThruNite Tn31 with a 3S 18650 battery holder.
I want to run the LED with at least 6A.
But until now i have not found the right driver!
check out this thread for info
led4power is in the uk so I am sure he can send you a few.
Pm led4power for more or start another GB
You'll loose the function of the magnetic control ring, but the HX-1175b1 can easily drive that if configured to 6V.
The LD-2 Driver is a really fine thing but it can not handle a 3S setup. I am using the LD-2 in my Zy-T08 (2S) setup. Correct me if i am wrong!
And yes unfortunately i will loose the function of the magnetic control ring.But it is not working at the moment anyways, because i bought the Host without driver and LED from James3. I tried to get the original driver and i tried to get the TN35 driver (witch can handle 6V LEDs) But ThruNite will not sell it to me. I got this answere when i asked if it is possible to buy them:
Sorry to tell you that we don’t sell the driver seperately.
So now i will mod the flash with a different driver unless someone has to sell a TN35 driver for a fair price! 
You’ll need a buck driver for 3S.
http://www.edc-light.com/5a-cree-xhp-50-70-current-regulation-flashlight-driver_p1050.html