If you want 10k, I would suggest Ushio. If you want a brighter bulb with a lower kelvin temp, then Venture makes a great 55K for less than $50. I have been runing three 175 Venture 55Ks for close to a year and I am very impressed with the intensity and color, better color in fact than my 250 Iwasaki 65K, but of course I run VHO actinics as well, they are both pretty yellow without them. I also have two 175 Ushios over a 55 gallon, the color looks great so far, but I just set the tank up and it hasnt even got coral in it yet so I can speak for their overall performance. I have tried the sunburst 12K bulbs in the past and was very displeased with their color, intensity, and price. Of course whether or not the color is pleasing or not depends on the individual. HTH