Driver for low current, high voltage LED

I am looking for a driver to drive a Nichia NC2W170B LED. The LED is rated to at 1.2Amps maximum current and 6.8 Volts. The voltage is higher than even the Cree XHP50 rated at 6V. I will be driving the LED from 2 cells or a 14V battery supply. I looked for drivers online and I thought these might work:

They all provide 1.2Amps constant current. Will they work or does it matter that the particular Nichia LED operates at 6.8Volts instead of the 3.4 Volts of most Cree LEDs?

i think every 2-cell (zener) driver for 6V LEDs should work…

a hard driven xhp needs also around 7V :wink: