Yes I have… In terms of tint and CRI there can be advantages if you mix in warmer emitters. If you just have de-domed emitters you can not expect higher CRI, but slightly less cool beam in total.
Problem is when you start mixing several different types of emitters with different vf (forward voltage), you easily risk that one type of emitters get way more current than the other type.
I recently tested to mix in 1 XP-2 with 4 XP-Gs. Tested with only 3amp input (divided on the 5 emitters wired in parallel). At startup the XP-G2 got half the current (1,5A). After a short while it was down to around 0,6 if I remember correctly. Since I had plans of higher current, I found it safest to not mix XP-G2 with the XP-G emitters despite that they actually seemed to level out fairly good. But I did not use much time to check the behavior accurately, so don’t quote me on that exact setup.
But thing is, if the one XP-G2 had 1,5A of the 3 amps. The other 4 had 0,375amp (1,5/4). Again, that was only at startup, but it shows how easily one type of emitter can get a lot more current.
You can see vf charts on Cree`s webpage for the various emitters.
You will also find graphs here but some are measured results from Match.
As you can see, small increase in voltage can make a huge increase in current.
Since XP-G2 and XM-L run can run at slightly different voltages (when you compare the same current) , you can not take the total amount of amps and just divide them on all the emitters. I would guess there is a high probability that the XP-G2s would get (way?) more current. One can do the calculation in theory, but best thing is the measure the emitter current yourself in your setup. So the best way is to wire everything up and measure how many amps go through the XP-G2s and the XM-Ls. Start with XP-Gs, Id guess the current would be higher in them.
If you wont bother with the measurements just copper mount the XP-G2s. Then you should have no issues to worry about, despite the possible differences in current to the emitters.
Hope this helps, and since Im not fairly noob-ish at all this, someone correct me if Im wrong… 