PAR
Short for Photosynthetic Active Radiation, refers to the spectrum between 400-700nm that plants use for photosynthesis.
PPF
A.k.a. Photosynthetic Photon Flux, is the total micromoles of photons (400-700nm) an artificial light generates per second.
PPFD
Short for Photosynthetic Photon Flux Density, refers to the total amount of photons (400-700nm) an artificial light generates that hit an area every second.
CRI
Color Rendering Index, is the ability of a light source that reveal the colors of various objects faithfully in comparison with an ideal or natural light source.

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