Need source for 5000K T5 Biax light bulbs

[mjsdas]

I'm planning to purchase a 24" high output T5 Biax light from High Tech Garden Supply. The light comes with two 6400K daylight bulbs which are more in the blue spectrum. The only other T5 Biax bulb that they offer is a 3000K bloom bulb which is in the red spectrum. Can anyone recommend a source for 5000K T5 Biax light bulbs? If not, if I use one 6400K and one 3000K bulb in the light fixture would it approximate of what a 5000K bulb would provide? Thanks for your help.