Not at all. I got the 14k with the fixture i purchased and it does appear pretty white. But the corals still have vibrant colors and still "glow". But with a 20k I bet you would get more of the modern reef look. Probably less par. and colors could be even better than the 14k since it would stimulate for colorful pigmentation. I'm actually contemplating on switching bulbs myself. But if it doesn't work out i wouldn't hesitate to use the phoenix 14k ever again.Do you mind if I ask about your 150w 14k? I have been reading those and 20k apparently give more blue.