"Lapideus" C#8

18 hours of light = 64,800 seconds 624 μmol/m2/s from the PAR meter Micromole μmol/s (micromole) is the unit in which P.A.R (Photosynthetic Active Radiation) is expressed. This unit indicates how many micromoles per second a light source emits. μmol/s is one-millionth of a mol (10−6 mol). 624x64,800=40,435,200