thanks man, What 10K do you reccomend? I have a 175watt 10K xm right now, and I think it's too yellow... that is why I wanted to do the 14K... I guess another option would be a 10K and a 20K? I am really unsure about this, there are pages that compare shots of a tank under different lights, but who is to say all monitors are color balanced the same? it's all subjective, and these bulbs are expensive!