[Myka]

Oh ok...for some reason I was under the impression you only had two. When/If you switch to the HQI ballasts, you may have to go through a few bulbs before you find the color you want. If you go with Ushio 10K and keep the VHOs that you have the same, you will have a yellower light than you are used to. You will have to figure out a way to change that. Personally, I would use 4 T5s for actinic and put 2 AquaBlue+ type bulbs in and 2 True Actinics in. That would REALLY pull the Ushios whiter/bluer.

Check that website, and it will show you the PPFD (similar to PAR) of each bulb with the PFO HQI ballast. You will notice that when you go with a higher Kelvin you will lose PPFD very quickly.