I used to only run 20k with actinic supplementation. I switched over to cheap 14k bulbs (I don't even know what brand they are) and it seems so much brighter and all the corals have adapted well. I always liked the blue colour but the 14k gives more of a "white" light which I like. My friend who knows nothing about aquariums came by a couple of weeks after I switched to 14ks and he commented "Man, what did you do to your tank, it's so bright now and your sand is glowing, it's so bright"
I'm glad for the change. Sorry I can't tell you the brand as I bought them from my LFS in a white box - brandless but cheap....
Hope this helps your decision.
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