Driver question for XHP50.2

Hi Guys!

I have an old (~10 years old) canister based diving light. It has 5pcs 5mm unknown LEDs, the battery packs are deprecated. So I would like to renew the lights. I found the CREE XHP50.2 (6V, j2) LEDs that fix for my requirements. I would like to drive them with 700mA current and a forward voltage is 28.3V. So guys, could you please recommend me a suitable driver for that task? The new battery pack will be 8 pcs of 18650, (4x2) that is a suitable size for the canister.

Thank you!