Par: photosynthetically active radiation. It’s the light given off between 400nm-700nm which is usable light that will drive photosynthesis.
Ppfd: photosynthetic photon flux density. This is the number of photons striking a cm2 per second. It’s basically the intensity of the light with the par range.
Ppfd: photosynthetic photon flux density. This is the number of photons striking a cm2 per second. It’s basically the intensity of the light with the par range.