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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 energy oxidizes the reaction center chlorophyll, which reduces the the electron carrier NAD+ to make NADH. The oxidized reaction center chlorophyll must be reduced by electrons from a chemical electron donor, such as hydrogen sulfide (H2S).