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The light-dependent reactions take place in the membranous sections of the chloroplast - thylakoids (granae/lamellae) - which offer a large surface area to absorb light energy. Do not confuse NADP with NAD which is a similar molecule involved in respiration. The main function of these reactions is to provide a source of ATP and reduced NADP, which are used to reduce CO2 in the light independent reactions. There are two photosystems consisting of chlorophyll and associated molecules.
From Wikibooks, open books for an open world. The light-dependent reactions, or light reactions, are the first stage of photosynthesis. In this process light energy is converted into chemical energy, in the form of the energy-carriers ATP and NADPH. In the light-independent reactions, the formed NADPH and ATP drive the reduction of CO2 to more useful organic compounds, such as glucose. The light-dependent reactions take place on the thylakoid membrane inside a chloroplast. 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.