The formation of is the final step in the transformation of light energy into the chemical energy of a biologically usable form.

These In the luminous phase, it occurs when important events of light transformation. The final step is the formation of ATP Formation from ADP + P + Energy Released in the jump of electrons from the oxidation of chlorophyll molecules. It is the fourth step, this is the phase of Photo phosphorylation of ADP, the process through the interaction of two photo systems: 1 and 2. First photo system 1 captures light, whose wavelength is less than or equal to 700nm (nanometers). Chlorophyll A molecules that absorb maximum at 700nm are called P700. The second is when the photo system 2 reacts with chlorophyll B molecules that absorb at a maximum of 680nm and are called P680.