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Plants and cyanobacteria have a light-harvesting complex, which is a collection of protein and chlorophyll molecules embedded in the thylakoid membrane.

A light-harvesting complex is a collection of protein and chlorophyll molecules implanted in the thylakoid membrane of plants and cyanobacteria that transfers light energy to a single chlorophyll molecule in the photosystem's reaction center.

The diverse photosynthetic species have a vast range of light-harvesting complexes. The plant-specific component PsaG keeps the light-harvesting complex I firmly attached to photosystem I. Lhca1, Lhca2, Lhca3, and Lhca4 are all LHC or chlorophyll a/b-binding proteins. The PS1 reaction core is surrounded by the LHC.

Photosystem I is generally bound to light-harvesting complex II, but depending on light conditions, it can undock and bind PS I instead.

Light-harvesting complexes (LHCs) are photosynthetic regulators that regulate light-controlled energy production in plants. LHC-related proteins help molecules form light antenna structures by coordinating molecules.

Photosynthetic efficiency, photoprotection, and photoacclimation are all enhanced by light-harvesting complexes.