Plants possess a number of pigments and if you look at O2 evolution
over the spectrum, 400-700 nm is the usable active radiation
wavelengths.

I'd suspect a two equivalent tanks one with green plants
and one with all very red plants (ie Alterneranthia) would
have different optimal absorbtion spectra though.

Not by much though if this is any indication:
http://www.msu.edu/course/lbs/145/lu...epsinPals.html


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