Concerning choice of center emitter, Osram W1 (6000k) vs. Luminus SFT-40 (6500k).
Hank denotes:
W2 (Osram CSLPM1.TG): 1300lm, Lux: 130Kcd (130,000cd)
SFT-40 6500K: 1800lm, Lux: 130Kcd (130,000cd)
500lm difference at that level is likely to be imperceptible to the human eye. In one review using a Convoy C8 as the host, the SFT-40 produces a slightly wider hotspot. LINK.