Calculated, Total, and Usable PPF?

A

av8ersteve

Active Member
Can someone help explain or know of a good article i can read to help understand these 3 terms? I just received my PAR meter and want to get the most out of it. Thanks again!

Calculated PPF
Total PPF
Usable PPF
 
J2M3S

J2M3S

Well-Known Member
av8ersteve said:
Can someone help explain or know of a good article i can read to help understand these 3 terms? I just received my PAR meter and want to get the most out of it. Thanks again!

Calculated PPF
Total PPF
Usable PPF
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Welcome to RIU!
Sure thing.

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Last edited:
CWF

CWF

Well-Known Member
You probably already know, but to be Mr Obvious:
PPF, PAR photon flux, is a flow of photons within the PAR range of wavelength. Flux is an old-fashioned word for flow. Since we use mol to count photons, the unit of PPF is mols/second.

Those terms just describe how much of the total flow actually goes where you need the illumination: The plant canopy. The meter actually measures how much flux is hitting an area, or flux density, expressed as PPF per square meter. PPFD. HTH
 
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