There's a huge difference between the actual color of many 10k bulbs, same with 14k, same with 20k. As an example, the ushio 20k is exactly the same bulb as one of the Geisemann 14k bulbs. When manufacturers list the color temp of the bulb, there's no real standard. You can go to Sanjay Joshi's site where he has test many different MH bulbs on several ballasts and you'll get an idea.

The phoenix 14k (or is it 12k) bulbs are pretty high in PAR, and very blue in appearance. Most of the really blue bulbs are almost monochromatic, which means there is a very steep ****e in a very narrow wavelength band. To me, these bulbs have a nice blue color, but contrasts tend to get a little washed out. The nicest lighting overall that I've seen is a fairly white bulb, like the ushio or XM10ks, with good strong actinic support. I'm using the ushio 20k on my corner tank because I don't have an easy way to add actinics and the phoenix (as well as most 10k bulbs) are too high in intensity for my shallow tank.