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In photosynthesis, the light-dependent reactions take place on the thylakoid membranes. The inside of the thylakoid membrane is called the lumen, and outside the thylakoid membrane is the stroma, where the light-independent reactions take place. The thylakoid membrane contains some integral membrane protein complexes that catalyze the light reactions. There are four major protein complexes in the thylakoid membrane: Photosystem II (PSII), Cytochrome b6f complex, Photosystem I (PSI), and ATP synthase.
Light Reactions is when plants use light energy and convert it into chemical energy which is easier to use. It takes place on the thylakoid membranes, uses water, and releases oxygen. It also uses ADP and NADP+ and makes ATP and NADPH, which are used in the Calvin cycle to make high-energy sugars using carbon dioxide.