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Re: Green light

As far as I know, green light is not a requirement for normal growth and 
is used much less efficiently than other wavelengths.
On another note, freshwater ecosystems do absorb light with fairly high 
extinction coefficients. Particulates, DOC, phytoplankton, zooplankton 
all absorb at particular wavelengths... the result is a light spectrum 
that is vastly different from incident radiation and one that is CHANGING 
all the time. IMHO this makes aquatic plants extremely well adapted to 
scavenging any and all PAR.