How many quanta of light are required per NADPH2 formation in photosynthesis​

Four quanta of sunlight absorbed by each Photosystem to provide the energy to do this.

Explanation:

Because each molecule of oxygen released involves the flow of four electrons from two water molecules to two NADP+s and requires four quanta of sunlight absorbed by each Photosystem to provide the energy to do this.

not sure if this is what you'r looking for eubacteria and archaebacteria