Haha... Well, I know you have dipped your toe slightly into this emitter mixing before. With-de-domed emitters there are not that many emitters out there that will neutralize the color tone, so the 6A1 will probably be the default choice.
I have had this on my agenda for a very long time. Like many other projects. But I like to take one step at the time, so I have been building up too it. :)
It works great. For me, another great thing is that now I know that when I have one emitter that I don't like as much, I just find the opposite in terms of color tone and then they mix nicely. :) Its nice knowing it works in practice too.
For months I have been playing a lot with holding 2 or single 3 lights side by side and playing with tint mixing. Now its time to put that knowledge into some multi-emitter lights. The days of having 3 of the same emitter in multi emitter lights are probably over for me. Its just nice knowing de-domed emitters can be combined nicely with regular emitters too. On some hard driven lights that have emitters in parallel, mixing XM-L2s and XP-G2s should work nicely too. As long as the XP-G2s are copper mounted. Normally, i prefer XM-L2 over XP-G2s though.
In my 9 XM-L light I have been saving up 1.st gen XM-L emitters for some time now. A bunch of various emitters should blend quite easily in a light like that. The main issue is that I will be lacking emitters with a red-tone (unless I buy them). Time will tell how it turns out. It should end up much better than stock though. As always, If I don't like it, ill change it. I often mod the same light several times anyway over some months. :p