I have seen one spectacular tank that runs only 10K, it was like a 220 and ran 3 on lumanarks if I recall. Accually I have a friend who runns only 10K and no supplemtation too.
I run XM 10K and since my atinic bulbs need to be replaced soon I think I will remove them insted or replacing them. This will also alow me to drop my hilides lower like I want to for better light, and part of the hilide won't be shadowed by the atinic bulb.
I personally like the color of 10K's, but that is all preferance.
I wish I could find that picture, but I can't seem to right now,
Sorry,
Whiskey