NADPH. During the Light Dependent Cycle of photosynthesis, light is absorbed by the chlorophyll. The electrons are excited, which starts them moving from one enzyme to another. A hydrogen atom attaches itself to an NADP molecule, converting it to NADPH.oth the ATP and the NADPH are used to convert the carbohydrates created in the Light Dependent Cycle to C-C bond energy. This is done in the Light Independent Cycle, or the dark reaction cycle.