It's called photoprotection: > High sunlight can raise plant growth rates but can potentially cause cellular damage. The likelihood of deleterious effects is l

It's called photoprotection: > High sunlight can raise plant growth rates but can potentially cause cellular damage. The likelihood of deleterious effects is lowered by a sophisticated set of photoprotective mechanisms, one of the most important being the controlled dissipation of energy from chlorophyll within photosystem II (PSII) measured as non-photochemical quenching (NPQ). Although ubiquitous, the role of NPQ in plant productivity remains uncertain because it momentarily reduces the quantum efficiency of photosynthesis. https://en.wikipedia.org/wiki/Photoprotection https://en.wikipedia.org/wiki/Photoprotection https://en.wikipedia.org/wiki/Non-photochemical_quenching https://en.wikipedia.org/wiki/Non-photochemical_quenching