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The first stage of photosynthesis is a series of reactions, known as the light reactions, that takes its name from the fact that light is required. The products of the light reactions are ATP, NADPH, and oxygen. ATP and NADPH are special, energy-storing molecules. The energy stored in these molecules is later used to make glucose, which is the molecule plants use for long-term energy storage. Lets take a closer look at the light reactions.
Light reactions turn light energy into chemical energy. Light is absorbed by chlorophyll and causes a transfer of e- and hydrogen from water to NADP+. They temporarily store the electrons. Water is split throughout this process and O2 is made a by-product. Light reactions use solar power to lower NADP+ to NADPH by adding a pair of electrons and H+. The light reactions also make ATP by adding a phosphate group to ADP. This process is photophosphorylation.