Steve, a question for you.
I know say 6500K iwasaki bulbs have great PAR, but do you know how much of that PAR gets to the bottom of a 30" tank compared to a 20K bulb?
The blue in the 20K should penetrate better, but I don't know whether 30" will make a difference or not?
And lower K is not always higher PAR. 20K XM bulbs put out more PAR than 15K XM bulbs, just wanted to point that out.
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