PPF : photosynthetic photon flux(μmol/s) the total amount of light (PAR) that is produced by a light source each second.
Efficacy: µmol/J Efficacy refers to how efficient a horticulture lighting system is at converting electrical energy into photons of PAR.
With the PPF and the input wattage, you can calculate the efficiency.
PPFD: Photosynthetic Photon Flux Density(μmol/s.m²) the amount of light that actually reaches your plants and algae within the PAR region or the number of photosynthetically active photons that fall on a given surface each second.
DLI: Daily Light Integral(mol/d.m²) the total amount of light that is delivered to a plant every day. DLI is a cumulative measurement of the total number of photons that reach the plants and algae during the daily photoperiod.
PAR: Photosynthetically Active Radiation is a region of the light spectrum (400 to 700 nm) that plants utilize for the process of photosynthesis. PAR is not a measurement or metric but defines the range of light needed to support photosynthesis.
