Your A-Z guide to understanding the terminology of modern cultivation.
PAR defines the type of light which is needed to support photosynthesis in plant life.
PPF tells us how much PAR is emitted by a light source. Measured in “micromoles per second” and expressed as: umol/second.
PPFD is measured over a one meter square area in “micromoles per square meter per second” and expressed as umol/m²/s.
DLI is measured over a one meter square area in “moles per square meter per day” and expressed as mol/m²/d.
umol/J is a measurement to determine how efficient a light is at converting electrons into photons.