Thanks willgolf for your experience, sounds like a worthwhile investment. The Lumin has a 10-pin configuration which seems to make the aftermarket cords limited to just a few companies.
Since I am using a high-end power cord (AQ Dragon) and a Synergistic Master fuse, I guess the natural evolution (for me) would be to upgrade the cord connecting the external power supply to the Lumin proper.
So, I took one for the team and went ahead and ordered the umbilical cord from Audio Sensibilities. There is even a 30-day guarantee!
I should have it late next week.
So, all you Lumin users take note...
ozzy