Famous Light Dependent Reaction Diagram References. They require light, and their net effect is to convert water molecules into oxygen, while producing atp molecules—from adp and pi—and nadph molecules—via reduction of nadp+. This produces hydrogen ions, electrons, and oxygen in the thylakoid lumen;
There are two light dependent reactions, the first occurs at photosystem ii (psii) and the second occurs at photosystem i (psi). For atp, it is a phosphate atom, and for nadph, it is a hydrogen atom. Web here is a general diagram of the cycle:
