Tachead
Flashlight Enthusiast
Vinh put a XHP35 HI in the SC600 before the HI was available and said it had a bit more throw but, noticeably less lumens. He also said it was not a worthy upgrade. So, other then a subjectively better tint(with possible less tint shift) and a bit more throw(slightly tighter hotspot) at the expense of lumen output, it is not a big upgrade from the regular SC600w.