photoinhibition
/ˌfəʊtəʊɪn(h)ɪˈbɪʃn/Physiology
noun
Inhibition of a physiological process (and hence sometimes the growth of an organism) by light, especially inhibition of photosynthesis at high levels of sunlight.
Origin
1950s; earliest use found in The Botanical Gazette. From photo- + inhibition.