The Gen3 PAR Light Meter is a full-spectrum quantum device that measures PAR in photosynthetic photon flux density (PPFD). One of the two important light readings you receive from the PAR Light Meter is PPFD, indicated by micromoles per square meter per second (µmol/m2/s). The PPFD reading shows both light intensity and the amount of light that is on a square meter of crops each second.
Another critical reading from the PAR Light Meter that helps assess plant health is Daily Light Integral (DLI). The DLI measurement indicates the PAR level or PPFD accumulation that falls on a square meter of crops during 24 hours. It’s calculated in moles of light per square meter per day (mol/m2/d).