Can’t answer your questions Prplxt, it is not my expertise I’m afraid.
Not today but yesterday I checked the 5700K 90CRI Samsung LH351D leds that I got from Kaidomain in a Nightseeker NSX3. The reflector holes in this flashlight are an unusual 7.5mm and Nightseeker did not bother with fitting centerpieces, they used standard 7mm ones that do not center the leds very well. But with the big die of the LH351D this is not problematic for the beam.
I did not like the stock user interface (always starting on a blinding turbo )so I replaced the driver with a good old BLF-A6 driver (from Banggood) soldered into a 17mm->22mm brass adapter (from the Convoy store).
As you may notice in the picture, I did the voltage-spike fix suggested by DEL, even though this driver (unlike the related X5/X6 driver) does not suffer from the drop out of turbo problem.
Even though I did the usual resistance reduction measures, spring bypasses and shortened led wires, the current draw and output on the maximum setting (that is basically direct drive) were a bit less than hoped: 12.5A and 2900 lumen, there was not much difference between a 40T and 30T battery. Apparently the voltage of this led is relatively high.
But I’m happy with the 2900 high CRI lumen in this mod, makes for a pretty nice flashlight.
The beam is nice, a floody hotspot that gradually dims into the spill without obvious tint changes (the reflectors are light OP).
The tint is an attractive cool white, close enough to the BBL, also at low current, and colour reproduction is as expected very good. In the hotspot at 350mA: CRI=92.7,R9=55,CCT=5330,duv=+0.0031, at max 12.5A: CRI=90.6,R9=45,CCT=5750,duv=+0.0040. The lime-coloured AR-coating on the front glass may have had an influence on the tint.