The clusters of chlorophyll molecules that capture light energy are called photosystems.

There are two main types of photosystems in plants:

* Photosystem I (PSI): Primarily absorbs light in the far-red region of the spectrum (700 nm).

* Photosystem II (PSII): Primarily absorbs light in the red region of the spectrum (680 nm).

Within each photosystem, chlorophyll molecules are arranged in a specific way, forming a light-harvesting complex. These complexes act like antennas, capturing light energy and transferring it to a reaction center, where the light energy is converted into chemical energy.