Otterpop, I run icecap electronic ballasts. 10k has good intensity, but gives out a slight pinkish hue after fully warmed up (when first turned on, icecap ballast seems to go through several stages, at the second to last stages, it gives out perfect intense clean white light with very slight blue hue). It shows blue corals well, but red/pink corals colors are a little washed out. 12k gives perfect clean white color with a little blue hue (very similar to 14k Hamilton I used to run), but has lower light intensity.
I ran 12k for a about a month, and switched to 10k with VHO actinic to get more growth since I have a newly setup tank, and like to see the frags to grow faster. It took a little while to get used to the slight pinkish color of the 10k, but it is really not too bad, at least I did not see the yellow color a lot of 10k bulbs show.