Photosynthetically Active Radiation (PAR)
This is NOT a measurement or “metric” like feet, inches or kilos. PAR defines the type of light which is needed to support photosynthesis in plant life.
Photosynthetic Photon Flux (PPF)
A measurement of the total light (photons) emitted by a light source each second. PPF tells us how much PAR is emitted by a light source. Measured in “micromoles per second” and expressed as: μmoles/second
Photosynthetic Photon Flux Density (PPFD)
A measurement of the light (photons) that reach the target each second. PPFD is measured over a one meter square area in “micromoles per square meter per second” and expressed as μmol/m2/s.
Day Light Integral (DLI)
A cumulative measurement of the total amount of light (photons) that reach the target during the photoperiod. DLI is measured over a one meter square area in “moles per square meter per day” and expressed as mol/m2/d.
Mole
A mole is a term used in science and is equal to something called “Avogadro’s number”, which is 602,214,150,000,000,000,000,000.
Micromole
One millionth of a mole or 602 quadrillion.
Photons
The name physicists give to light particles.
Photoperiod
The period of time during which natural or artificial light is available to promote photosynthesis in plant life each day.
Post time: Feb-23-2021