In cyclic photophosphorylation, the electron expelled by reaction center returns back to it, whereas in non-cyclic photophosphorylation, the electron expelled by reaction center of the pigment molecule is not returned back to it. In non-cyclic photophosphorylation water is consumed in the process and both, ATP and NADPH are formed; whereas in cyclic photophosphorylation water is not consumed in the process and only ATP is formed.