Micromol (μmol/s), PPF and PPFD
Micromol
μMol/s (micromol) is the unit in which P.A.R. 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).
Photosynthetic Photon Flux (PPF)
This is related to PPF, which stands for Photosynthetic Photon Flux. PPF measures the total amount of PAR produced by a light source per second. PPF is also expressed in the unit μmol/s (micromol).
Photosynthetic Photon Flux Density (PPFD)
PPFD stands for Photosynthetic Photon Flux Density, which refers to how much PAR reaches the crop. The closer the light source is to the crop, the higher the PPFD will be. The distance from the light source to the crop determines: uniformity, light intensity, and light pollution. The best setup varies depending on the situation and is customized. We are happy to assist you in creating a suitable plan. PPFD is expressed in the unit μmol/s (micromol).
Example Case with
Willem buys a lamp with an output of 2000 PPF. This means that Willem’s lamp emits 2000 μmol/s (micromol per second). The distance from the lamp to the crop is 3 meters. Using a light sensor, Willem can measure his PPFD. He measures that 100 μmol/s (micromol per second) is reaching his crop.
New articles
HortiContact 2026 Recap
Ledgnd Reflects on a Successful Edition of HortiContact 2026 HortiContact 2026 at Evenementenhal Gorinchem once again served as a meeting place for the Dutch greenhouse horticulture sector. Ledgnd loo…
From Climate Control to Plant Control: The “Google Translate” of the Plant
During HortiContact in Gorinchem, Ramon van de Vrie spoke on the HortiBiz NewsRadio stage about a development that is becoming increasingly visible in greenhouse horticulture: the shift from climate-b…
Horticontact 2026
Weather conditions play a key role in the daily steering of the greenhouse. That is why the MyLedgnd data platform relies on reliable weather data from the KNMI. But how is this information actually g…
Read more
HortiContact 2026 Recap
Ledgnd Reflects on a Successful Edition of HortiContact 2026 HortiContact 2026 at Evenementenhal Gorinchem once again served as a meeting place for the Dutch greenhouse horticulture sector. Ledgnd loo…
From Climate Control to Plant Control: The “Google Translate” of the Plant
During HortiContact in Gorinchem, Ramon van de Vrie spoke on the HortiBiz NewsRadio stage about a development that is becoming increasingly visible in greenhouse horticulture: the shift from climate-b…
Horticontact 2026
Weather conditions play a key role in the daily steering of the greenhouse. That is why the MyLedgnd data platform relies on reliable weather data from the KNMI. But how is this information actually g…
Do you want to know more?
Interested in what Ledgnd can do for you? Leave your phone number, and we will contact you as soon as possible for a non-binding informational conversation
