The kelvin rating of the bulbs used is what changes the coloration via photograph. Granted you can correct this via white balance, but I'm sure their object was to get "what the eye sees", so based on Kelvin rating, this can easily change. The Phoenix 14ks are uber blue and alot of people that do not use actinics use them for that specific reason. I personally love them. Coloration of corals is dependent on overall conditions of the water, including light. Alot of zoas under high lighting conditions will have more white in them in comparison to those that are in areas of more subdued lighting.
HTH