Photosynthetically Active Radiation PAR defines the type of light which is needed to support photosynthesis in plant life
Photosynthetic Photon Flux Density PPFD is measured over a one meter square area in “micromoles per square meter per second”ans expressed as μmole/㎡/s
Photosynthetic Photon Flux PPF tells us how much PAR is emitted by a light source Measured in “micromoles per second”and expressed as μmoles/second
Stands for micromole per Joule μmol/J It is a measurement to determine how efficient a light is at converting electrons into photons