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
Aftermovie GreenTech 2025
Ledgnd looks back on a successful GreenTech Amsterdam 2025. During the exhibition, we once again held many valuable conversations about data-driven cultivation optimization and the role of plant feedb…
New sensor for growers: Ledgnd and Aranet close the gap in light strategy
During GreenTech 2025, Ledgnd and Aranet jointly launched the Light Spectrum Sensor and its integration into MyLedgnd. In the Hortibiz studio, Ramon van de Vrie (Ledgnd) and Erik van der Made (Aranet)…
Ledgnd announces co-founder Matthea Rijneker as new CEO
Ledgnd, a specialist in data-driven cultivation optimization for the greenhouse industry, has announced the appointment of co-founder Matthea Rijneker as its new Chief Executive Officer. In her new ro…
Read more
Aftermovie GreenTech 2025
Ledgnd looks back on a successful GreenTech Amsterdam 2025. During the exhibition, we once again held many valuable conversations about data-driven cultivation optimization and the role of plant feedb…
From climate to crop why plant science is the key to better cultivation decisions
In the greenhouse, everything revolves around creating the right conditions. Light, temperature, CO2 and humidity are all factors you measure, control and optimise. Traditionally, growers focus mainly…
The 3 biggest pitfalls when starting with sensors in the greenhouse and how to avoid them
More and more greenhouse growers are using sensors and plant feedback systems to collect data. It is a logical step, because measuring is knowing, and data is a basic requirement for anyone looking to…
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
