I would go with the Phoenix 14k bulbs. They have great PAR and excellent color. IMO 20k's aren't very good. The Phoenix should have the color you want without sacrificing intensity.
I'm currently using the radium 20k. I like it. I've only used 2 other bulbs, a phoenix 14k and another 20k which I don't remember the brand. The radium is an expensive bulb, but if you have expensive corals you should get a nice bulb to compliment your corals.
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