Wanting to put a 10W LED in an 18V Ryobi flashlight

I want to upgrade one of these.
This video was my inspiration, but I don't want to uses a 20,000K LED. I was looking for more of a natural whit, so I', looking for a 10W LED in the 4000-6500K range.
This is the heatsink and LED + driver that this guy used.
http://www.ebay.com/itm/Solid-Alumi...006?pt=LH_DefaultDomain_0&hash=item5b0aaa5906
http://www.ebay.com/itm/10W-Cool-Wh...383?pt=LH_DefaultDomain_0&hash=item3a7f163a8f

Does anyone know if Cree makes a 10W LED in the 4000-6500K range, that will mount directly to this heatsink, and work with this driver? I know the driver will let me use my 18V battery to power the 12V LED. With that being said, I don't necessarily have to use the driver i linked earlier. I would like to use a Cree LED and a heatsink with equal or smaller dimensions as the one linked above.

Any help is greatly appreciated!

A 20mm star should bolt up to that heatsink fairly well; the screw heads would catch on the perimeter by my estimation. Thermal epoxy like arctic alumina will allows any led star to work with it.

Cree XP-L, XM-L, and XM-L2 on a copper star are good choices, but single die LED's like this are not typically 12v, they are approximately 3.5 volts. What you need is a buck driver capable of delivering 3 amps and handling beyond 18v. A b3flex would certainly do the job but its not inexpensive. There aren't many options for higher voltage buck drivers.

That host is plastic so there isn't going to be much heat exchange from the heatsink unless it will see some airflow or you mount a small fan in it.