What is μmol?

μmol or μmol/s or μmol/j are scientific ways pf measuring substances like light. Micromoles per second (μmol/s) or Micromole per joule (μmol/j) are other measurements using the measured substance (like light) based against time related or measured against energy used to create the substance measured.

What is PPFD?

Photosynthetic Photon Flux Density or PPFD is a photon density measurement that takes the range of visible light (400-700nm) in a given measured area. It is a baseline rating used to determine the value of artificial lights, today. Not to say there are not other measurements that can be used and may give different results. PPFD does not measure UV or light waves past 700nm.

What is PPF?

Photosynthetic Photon Flux Is the photon measurement without the measurement of density specifically to a given area, like PPFD gives.

What is PAR?

PAR is photosynthetic active radiation, that is specifically related to visible light that can be directly linked to photosynthesis in plants. Its important to remember that this measurement also only uses visible light to measure against and nothing outside of 400-700 nanometers.