Funner, the h1-a driver is a 1-cell boost driver (take in about 3.7V from single lithium battery), and output up to 3A at about 6V, so it look to me like constant current boost driver. Because of that, you can drive XHP50 and XHP70 led from Cree, if they are in 6V configuration on pcb. The xhp50 and xhp70 are similar other than xhp50 is a bit smaller and handle less maximum current (4.8A nominal vs 6A), so you will have no difference in performance, other than that a xhp70 driver may be able to output even more power.