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The pure actinic or super actinic bulbs are more of a purplish bulb than a blue. The ATI blue Plus, Giesemann actinic plus are blue bulbs. The Current USA bulbs that came with your fixture are probably the Current 460nm which they call or used to call "actinic" but they are actually blue. Current does have a 'true" actinic 420nm bulb as well. The blue bulbs have higher par than the actinic purple bulbs.
The ATI Aquablue bulbs are white with a slight blue tint. They are probably 11000K or 12000K. The next bluer bulb gets really blue like the blue plus. The only way anyone really gets to a color that they really like is by buying some of each of the bulbs and experimenting. But starting off with something that Grim recommends you cant go wrong. Then you can tweak from there if you want to adjust the color some.
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