A little collection of 4000K loaded lights:
I replaced the XP-L HD in the SP32A with a LH351D, replaced an XP-L HI in the S2+ with the 351D that was in the generic zooming light (with A6 clip) and put a 219C in the zoomie.
I felt I wasn't getting as much out of the 351D in that zoomie (typical with any small aspheric) as I would if it were in an SMO reflector. The SP32A has a great SMO reflector and even tames the 351D beam to be fairly focused. The 219C (from MTN) is one of the more rosy 4000K but I didn't notice it until I put it behind the convex lens. And it gets hot, pushed at 5A+ by a Convoy SST40 driver.
I loaded my pockets and took these out to my 'test range' for tint comparisons from 3 LED manufacturers.