Im wanting to do a custom build using an SOB 1000 and a Cree XLamp XHP50.2 module.
Im going to get the 6V version of this LED, but have no idea what voltage this driver puts out?

Is there any other 14mm buck drivers available I should look at instead?

Is it more efficient to use an LED that is less powerful and run it closer to its maxium power?
Since this module is 1W and the LED is rated up to 3W in power, it would be only running up to a third of its maximum output.