Further, XM-L2 is the successor to the XM-L design, with recipe tweeks, giving more color/tint groups and output ranges. AFAIK, a T6 bin of output level is the same whether XM-L or XM-L2, but I also like to know the tint, which often isn't spec'd so the light maker can buy whatever is available. Pure output isn't so helpful if the tint is poor. If I want a light that has a nice design but otherwise unknown tint, I just replace the LED myself.

Again, statements of light output must always be questioned. It should be out-the-front lumens of a real device tested in an integrating sphere under stated conditions (which mode, etc) to be meaningful. FL1 standard does this. Wild theoretical guesses/lies are common.