Cyclic Photophosphorylation occurs as a means to produce additional ATP rather than ATP and NADPH. This is because the Calvin Cycle (next episode) requires more ATP than NADPH.PSI = Photosystem 1, PSII = Photosystem 2Noncyclic Photophosphorylation: https://cdn.kastatic.org/ka-perseus-images/faeb1179a538a3a8106fa5f3b9bd90c92f9834a7.pngCyclic Photophosphorylation: https://cdn.kastatic.org/ka-perseus-images/d47991f2cf9c7a4fc22f055b60793af8c341991f.pnghttps://quizlet.com/30876000/light-dependent-reactions-light-independent-reactions-flash-cards/