6500k vs. 10k MH
 

By the way I am looking for 150w SE 10k MH bulbs. I am wondering how much of a difference in color and growth there will be going with the 10k. I seem to have very good growth with the 6500k's. I am thinking I will like the 10k's better for looks but not sure if the growth will change any. Anybody have Ideas or comments or maybe even some pics of different K's.

Anybody have Ideas?

Really cant tell till you change them. Will depend on the specific coral. You can be meeting their needs at a different k.