Daily light integral (DLI) is the amount of PAR received each day as a function of light intensity (instantaneous light: μmol·m−2·s−1) and duration (day). It is expressed as moles of light (mol) per square meter (m−2) per day (d−1), or: mol·m−2·d−1 (moles per day). Example calculation: * DLI (mol/m2/day) = average light intensity (μmol/m2/s) · time (in seconds) / 1.000.000 * DLI (mol/m2/day) = PAR · h · 3600 / 1.000.000 * See also: Daily PPF can be calculated directly from the instantaneous PPF from the following equation: μmol m−2 s−1 multiplied by 86,400 and divided by 106 = mol m−2 d−1