Very spectra dependent. The maximum oxygen evolution utilization, at 680nm is 27%. Very little is absorbed between deep blue and deep red. The majority stored, is stored as glucose, which does not amount to much except in sugar cane. A good percentage of blue is dissipated as heat because it has 50% more energy than red. Very little green yellow orange is absorbed.
Fluorescence, the photons re-emitted at a higher wavelength, does lose a little energy in the wavelength conversion. Hopefully that photon is used by a leaf lower in the canopy. Fluorescence only happens in red spectrum.
You are correct with the spectrum typically used. A very small percentage is utilized.
Plants use photons mostly in photochemical oxidation of water, and to reduce carbon dioxide to organic carbon compounds, typically sugars.
The biochemical production of secondary metabolites (e.g. cannabinoids) by these carbon reactions is where things get interesting.
Mostly off topic. Except maybe how the efficiency of photosynthesis is affected by photorespiration in the biochemical carbon reduction. I do not understand chemistry well enough to understand biochemical processes.
