This is because electrons from the reactive center are passed down a conveyor belt of protein chains (of the chlorophyll pigment) and the end products (NADPH) are recycled back to start the cycle again, while the high energy electrons in the reactive center are replaced by others from the next photolysis.
Explanation:
The high energy electrons leave the reactive center of the photosystems of chlorophyll and get pass down a protein chain as their energy is harnessed to create a proton motive force across the lamellae membrane. This proton motive force is used by ATP synthase to create ATPs. The electrons are ultimately used to reduce NADP+ to NADPH.
The NADPH is used to reduce carbon dioxide -in the Calvin cycle of dark phase- to carbohydrates hence recycling back the NADP+. The electrons of the reactive center of the phtosystem are replaced by high energy electrons from the split of the next water molecule (in a process called photolysis).
This process continues in this cyclic manner.
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