Inexpensive nano lighting

[TheReefGeek]

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.