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.

the sun creates it's own light, also gives light and life to bunch of stuff like plants,animals,humans etc.photosyntesis is the process of making food which needs sun,water,nutrients etc.