I built a “mega-M6” with 12 of these 319A 5000k 80CRI. They work great and have a great beam and color, output is good as well, although not quite up to XP-L levels. The Low VF means that they will pull a lot of power though, so watch out if using an FET driver.
You can see it here: 13,333 lumen Nichia 319A "Mega M6" by Texas_Ace, I had to use over 6 feet of wire to reduce the power!