After further reading, I've found this..
It’s true that plants appear green because leaves reflect more green light than other visible wavelengths, but typically only around 5 to 10 percent of green light is reflected, and the rest is absorbed (roughly 85 percent) or transmitted (5 to 10 percent) through the leaf. Light transmitted through one leaf is subsequently available to leaves below, so those photons are still potentially useful to plants. In addition, pigments other than chlorophyll absorb green light to make it useful for photosynthesis. Therefore, green photons are essentially as useful to plants for photosynthesis as red and blue photons.
Which completely flies in the face of what I've understood in the past.
Still looking for where its shown that red and blue spectrums are transmitted at smaller rates (5-10%) than green spectrums...