An NADPH regeneration process that contributes to the light reactions of photosynthesis. The light reactions of photosynthesis use energy from photons to generate high-energy electrons. These electrons are used directly to reduce NADP+ to NADPH. NADPH is a relatively stable molecule and can pass on its hydrogen atom to other molecules in chemical reactions. [ GOC:jid https://www.worldcat.org/search?q=bn%3A0716746840 https://www.worldcat.org/search?q=bn%3A0816017360 ]