Plants are green because they _reflect_ non-magenta light! This energy is wasted. If you saw artificial grow lights, they are now often magenta-colored exactly because the green part of the spectrum does nothing, and you might as well save some energy.

These panels absorb that light before it gets to the plant, so it's a win-win.

The history of everything in biology is us looking at a plant and going “oh wow, it’s green, that means it’s only absorbing magenta!” and then finding out years later that the plant is almost entirely green except that every hundredth cloroplast is actually magenta and that’s the signal the plant uses to tell when the sun is up which is how it times its seed releases, which is why our crops all died this year and won’t grow back.