How would changing the structure of the porphyrin ring in chlorophyll affect photosynthesis?

I cannot for the life of me get this answer. I think that by changing the ring structure you would either slow down or accelerate the rate of photosynthesis. I'm not 100% though.How would changing the structure of the porphyrin ring in chlorophyll affect photosynthesis?Changing the structure of the porphyrin ring will change the wavelength of light that gets absorbed by the chlorophyll.

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