In case you didn't see them, I posted some comparison beamshots in "My Bike Light Thread" post #46 & $47. I modded a Nitefighter BT40S that came stock with NW XP-G2's (which I had compared tint with other lights and found to be 4C or very very close) over to Nichia 219C's. I then compared these Nichia's to my favorite XM-L2 5B1 tint.
(So I did get around to using them without letting them sit on my workbench for months!)
-Garry