* ATP (adenosine triphosphate): This is the energy currency of cells.
* NADPH (nicotinamide adenine dinucleotide phosphate): This is a reducing agent, carrying high-energy electrons.
* Oxygen (O2): This is a byproduct of the light reactions, released into the atmosphere.
The light reactions use light energy to split water molecules, releasing oxygen and producing ATP and NADPH. These products are then used in the Calvin cycle (the dark reactions) to convert carbon dioxide into sugar.
