Hi Richard,
Not sure if it has been asked before but are you planning on stocking the Luminus SST-40 in P2 bin cool white? KD only has N4 bin and according to Djozz data and 18sixfifty observation it might be a better led than the XM-L2 with lower Vf and capable of more amps.
Something like a P2 Bin in any of the following cool white tints:
Luminus Tint / Cree equivalent Tint
BA => 1A
BB => 1B
BC => 1C
BD => 1D
CB ===> 2B
SST vs. Ansi white color chart for reference (Ansi white chart credit goes to flashlightwiki)
Thanks