# Biology Photo efficency

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How do you calculate the photosynthetic efficiency ..the % of solar energy reaching vegetation in an ecosystem that is converted to GPP ???

I know the amount of sol energy, GPP, NPP etc... is it the GPP divided by the energy reaching the amount of solar energy perhaps ???

Thanks

Recent literature indicates a great growing controversy in this. The problem is that "solar" energy includes many wavelength the plant does not use. Including that energy may not be appropriate. The LED illumination for plants greatly reduces the illumination, but the plant converts it to energy remarkably well. So what the future brings in this, I cannot predict.

Traditionally, GPP/Solar energy is estimate of conversion efficiency. However, measuring it is another matter. One has to assume dark and light respiration is the same to use GPP.

Bob,

Thank you very much.. !!

Snail

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