I run 3 blue + 1 purple +. Blue + bulbs have very high par even though they are blue. I don't think the difference between enough light or not enough light is going to be one bulb especially if it's not a actinic. Adequate lighting would be more dependent on the type of fixture and the depth of the tank in my opinion. Watts per gallon is also an outdated method of determining how much lighting you need.
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