There was a good link in one of the saltwater post that had some real good information about mh
bulbs. My personal preference is 14k phoenix. I used them in 150w, and use them in 250w currently. The 250w ended up being almost too blue. My lfs
was using 20k 250w (don't remember the brand) and my 14k's were bluer. Each bulb is going to have a different color depending on who makes it. Look at my pictures. The bulb on the left is a 15k, and the bulb on the right is a 14k phoenix that I had in the 55 gallon before I tore it down. And the newest picture of my 150gal has a 10k t5 to help drown out some of the blue.