Lumen and LUX values should never be used to measure the effectiveness of garden lighting. In case of horticultural luminaires, PPFD is used to express their exact light intensity Let us see the most important definitions and concepts of this industry explained: DEFINITIONS PAR Photosynthetically Active Radiation PPF Photosynthetic Photon Flux
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The total amount of photons in the 400-700 nm range that is produced by a light source each second. Mea- sured in μmol/s.
The range of light that plants are able to use for photosynthesis. 400-700 nanometers.
PPFD Photosynthetic Photon Flux Density The number of photons in the 400-700 nm range received by a surface for a specified amount of time. Measured in μmol/s/m². EFFICACY Refers to how ecient a horticulture light system is at converting energy into PAR photons. By dividing the PPF of a light system with the input power (W), you can calculate ecacy. Measured in µmol/J.
DLI Daily Light Integral
The daily flux of photons per ground area.
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