Question: what is the chemical equation of light reaction?
Answer: The overall equation for the light-dependent reactions under the conditions of non-cyclic electron flow in green plants is: 2 H2O + 2 NADP+ + 3 ADP + 3 Pi + light → 2 NADPH + 2 H+ + 3 ATP + O. Not all wavelengths of light can support photosynthesis.