This isn't quite a flashlight project but rather an aquarium lighting project. I figured that some of the brains here may be able to help though.
I am using the Xitanium 700mA driver ( LED120A0700C24F ) to power six K2's ( LXK2-PW12-R00) in series. In practice, the diver powers 1-3 drivers to full brightness, but after that the LEDs are dim. This driver should be able to drive them all to 700mA.
Thanks for your help