After finally upgrading my lights this is what I have and my question. 2 Iwasaki 6500 250W supplemented with 220 VHO actinic. The lights look really good together over my 75 but one seems to put off a whiter light than the other. One of the ballast (both are H37) doesn not have a capacitor in line while the other does. The ballast without capacitor seems to put out a whiter light.

Any ideas?