If it's actually a 14K bulb you should be getting quite a bit of blue already with some white to it. I use 14K Hamilton double ended bulbs and love the color I get.
But like apedroza said, it really depends on the maker of the bulb and the ballast that is driving that particular bulb that make up what the final look is for each one. Hard to explain without just being able to see it in person but my Hamilton 14Ks will most likely look at least a little different with every ballast combo I run them against whether they are magnetic or electronic.

Is it this one? if so I'm not sure if Coralife makes their own bulbs or not or if this is an electronic or magnetic ballast since they don't say much.

http://www.hellolights.com/index.asp...amp;ProdID=445