I was the one who found out the 20w will NOT fit an X5M after shredding my hands in the tight confines and scuffing up the LEDs a bit.
With that said, Joe took EXCELLENT care of me... He sent out a 12W set that look absolutely fantastic and were a PERFECT drop in replacement. Shipped at his cost and difference in cost refunded to me without hesitation. VERY pleased with the product and even more so with the service!!!
And I am sure people are gonna ask....yes, the 12w is quite bright. Haven't seen Lux in person to compare, but I cannot imagine they would be much, if any, brighter. I don't think you can go wrong with either company, but my money went to Joe!