Sounds like a VHO bulb? Can you give us the specs off that bulb? Also, as Mike explained.

Essentially you could make the VHO (if that's what it is) a 6500k (yellow) bulb since that one uses the most wattage and it will give you the best growth. Then to offset the yellow, you could add to super blue bulbs to the other fixture. It is all a matter of playing around to get the coloration/growth that you want.