The products of the light-dependent reaction are ATP, NADPH, and oxygen. Oxygen is given off as a waste product while ATP and NADPH pass to the light-independent reactions. The ADP and NADP produced during the light-independent reaction can pass back to the light-dependent reactions to allow more ATP and NADPH to be produced.
H+ + 2e- + NADP+ → NADPH
Non-cyclic photophosphorylation involves photosystems I and II and produces both ATP and NADPH
Cyclic photophosphorylation involves Photosystem I and produces ATP