Final answer:
The light reactions of photosynthesis supply the Calvin cycle with ATP and NADPH & H+ as a source of energy and reducing power.
Step-by-step explanation:
The light reactions of photosynthesis supply the Calvin cycle with ATP and NADPH & H+. These molecules are produced during the light reactions and serve as a source of energy and reducing power for the Calvin cycle. ATP is used to provide energy, while NADPH & H+ serves as a source of electrons for the conversion of carbon dioxide into organic sugar molecules.