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What's the difference between PPF and PPFD?

  • Categories:Industry News
  • Author:Marco Cao
  • Origin:
  • Time of issue:2021-04-29 17:39
  • Views:

(Summary description)PPF and PPFD are both deal with the amount of light for a light source or location, firstly we need to know what is a photosynthetic photon?

What's the difference between PPF and PPFD?

(Summary description)PPF and PPFD are both deal with the amount of light for a light source or location, firstly we need to know what is a photosynthetic photon?

  • Categories:Industry News
  • Author:Marco Cao
  • Origin:
  • Time of issue:2021-04-29 17:39
  • Views:
Information

PPF and PPFD are both deal with the amount of light for a light source or location, firstly we need to know what is a photosynthetic photon?

 

A photon is a single particle of light, those that are capable of contributing to photosynthesis are considered a photosynthetic photon. Specifically, this includes photons with wavelengths between 400 nm and 700 nm.

 

Then we can understand what are PPF and PPFD:

  • PPF - photosynthetic photon flux

PPF represents the total amount of photons in the PAR range emitted from the light source per second, expressed in μmol/s (micromoles per second)

 

  • PPFD - photosynthetic photon flux density

PPFD measures how many photons effectively hit the plants per unit time per unit area (μmol/sec/㎡ ).

 

PPF and PPFD measure the quantity of such photons. The critical difference is that PPFD measures the density of these photons falling on a particular surface, while PPF is a measure of the total number of photons released from a light source.

 

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