A new empirical equation is introduced that describes the photosynthesis by phytoplankton as a single, continuous function of available light from the initial linear response through the photoinhibited range at the highest light levels liable to be encountered under any natural conditions. The properties of the curve are derived, and a procedure is given for fitting it to the results of light-saturation experiments for phytoplankton....
Platt, T., C. L. Gallegos, and W. G. Harrison. 1980. "Photoinhibition of photosynthesis in natural assemblages of marine phytoplankton." Journal of Marine Research 38, (4). https://elischolar.library.yale.edu/journal_of_marine_research/1525