I have the Aquamedic light fixture w/3x250 de 10k and 2x150 de 20k. One 20k is more blue than the other. Any one have an idea why? Does it need to "burn in"? Is the bulb bad?
That's a really nice fixture, where did you get it?
If it's all brand new, I would say it's probably just in need of some burn time. But swap the bulbs around and see if it's a ballast.