We LOVE our Reeflux 12K SE - the color is just perfect for my taste.... a lovely blue hue but not too artificially blue, if that makes any sense.

Our lighting is a 250w MH SE 12K Reeflux at each end of the tank and 48" of T5s over the center (didn't want halides over that huge center brace). I am currently playing with the bulb configuration on the T5s to try to get it to match the 12ks better. Most do not really notice (like Mike, for example), but I am hugely aware of the discrepancy between the middle of the tank and the beautiful blue ends.