Found an intersesting article on the effects of light spectrums; specificly green. Although mostly over my head , I have deduced that we asumed red and blue soley drove photosynthesis because that is what cloroplasts so readily absorb. However green light had greater penetration and thus becomes available (present) to more [of the] tissue.
http://pcp.oxfordjou...t/50/4/684.full
" In other words, < 1% of the red or blue light is transmitted through the chloroplast. On the other hand, for wavelengths that are weakly absorbed, such as green light, T is considerable. When ε for green light is assumed to be 500 m2 mol–1, A and T would be 0.05 and 79.4%, respectively."