I have an E with a Tana module using a 219c that if I recall correct is a 4200k. I prefer the slightly 'golden' tone of the C versus a slight pink from the B. Later I tried a module he built with a 3200k C and really like that one as well. So when member 'mindabew' did the 3000k M361w Nichia 219c group buy I felt confident it would be a gem. If I recall correct he got the LED's from ' mountain electronics', sent them to Gene Malkoff who assembled them.Cool unit! BTW, I happen to have some nice 219Cs @4000K in a couple of lights and like them, so if you're good w/3000K, you'll probably like this too. Just used one to take out the trash a few minutes ago.