Hi! I currently writing a literature review on R:FR ratios, please can someone help me with this question ^^^
Victoria Palumbo Photon irradiance and Photosynthetic Photon Flux Density (PPFD) are notions that are similar but not identical.
The intensity of electromagnetic radiation (e.g., light) as it is emitted from a source is measured as photon irradiance. It is commonly measured in photons per square meter per second (photons/m2/s) or watts per square meter (W/m2).
The photosynthetic photon flux density (PPFD) is a measure of the number of photons received by a surface per unit of time in the 400-700 nm wavelength range (i.e., the photosynthetically active radiation or PAR range). It is usually measured in micromoles per square meter per second (mol/m2/s).
While photon irradiance and PPFD are both measurements of light intensity, PPFD is more particularly focused on the range of wavelengths that are most significant for photosynthesis and hence more helpful for evaluating plant growth and development potential. In horticulture and plant physiology research, PPFD is frequently used to investigate the effects of varied illumination conditions on plant growth and development.
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