Ron Kundla wrote in message . ..
http://www.madsci.org/posts/archives...6481.Bc.r.html
This one is interesting because it says that photosystems in plants
can ONLY use red light. The photosynthetic pigments absorb light at
different wavelengths and 'down-convert' it to red light. This
includes things from trees all the way down to blue-green algae!

That's the deal Neil.

The down conversion means that only shorter wavelengths than 680 and
700 nm will be used. These are higher energy.

All those other pigments absorb higher energy wavelengths
(smaller/shorter wavelenghts).

Plants and algae can change these pigments to maximize their capture
of light.

Regards,
Tom Barr