Photosynthetic Active Radiation (PAR) The radiation of a specific wavelength range (400-700nm) used by plants for photosynthesis is called photosynthetically active radiation, and there are two labeling units: One is expressed in photosynthetic irradiance (w/m2), which is mainly used for generalized research on photosynthesis of sunlight. The second is expressed by the photosynthetic photon flux density PPFD (umol/m2s), which is mainly used for the study of plant photosynthesis by artificial light sources and sunlight. This method of using the photon flux radiated to the surface of the plant per second to express the radiation ability of the radiation source is called the PPF_PAR method. PAR accounts for about 50% of the total solar radiation. It should be noted that the unit of photosynthetic irradiance does not reflect the influence of wavelength.
PPF: Photosynthetic Photon Flux (Photosynthetic Photon Flux) refers to the number of micromoles of photons emitted per second from an artificial light source in the 400-700nm wavelength band, and the unit is umol/s.
PPFD: Photosynthetic Photon Flux Density (Photosynthetic Photon Flux Density) corresponds to PPF is the number of micromoles radiated by the light source per square meter per second, the unit is umol/m2s, which is the concept of density. PPFD is the PPF expressed in one square meter. PPFD is a physical quantity related to the radiation distance, which is inversely proportional to the square of the radiation distance. 1PPFD means that 1 micromole of photons per second radiates on a surface of 1 square meter. How big is 1umol/m2s (PPFD)? It means that there are 6 photons in 10 square nanometers.
YPF: The yield of photon flux (Yield Photon Flux) refers to the number of micromoles of photons radiated per second in the wavelength range emitted by the artificial light source, and the unit is umol/s. The generally considered wavelength band is 360-760nm. For LED light sources, the wavelength range is set to 380-800nm.
YPFD: The resulting photon flux density (YieldPhotonFluxDensity), corresponding to YPF is the number of micromoles of radiation per square meter per second, in umol/m2s, which is the concept of density. YPFD means YPF in the range of one square meter. YPFD is a physical quantity related to the radiation distance, which is inversely proportional to the square of the radiation distance. YPFD can more accurately express the light quantity of LED plant light quality.
The difference between PAR and PPFD, PAR is a physical concept, and the unit of this physical concept of PPFD. The relationship between PPFD and PPF: PPFD is the basic quantity derived from planting process parameters, and PPF is the main parameter for lamp manufacturing.
The core parameters of LED grow lights
Introduction to the core parameters of LED plant growth lights:
Photosynthetic Active Radiation (PAR)
The radiation of a specific wavelength range (400-700nm) used by plants for photosynthesis is called photosynthetically active radiation, and there are two labeling units:
One is expressed in photosynthetic irradiance (w/m2), which is mainly used for generalized research on photosynthesis of sunlight.
The second is expressed by the photosynthetic photon flux density PPFD (umol/m2s), which is mainly used for the study of plant photosynthesis by artificial light sources and sunlight.
This method of using the photon flux radiated to the surface of the plant per second to express the radiation ability of the radiation source is called the PPF_PAR method.
PAR accounts for about 50% of the total solar radiation. It should be noted that the unit of photosynthetic irradiance does not reflect the influence of wavelength.
PPF:
Photosynthetic Photon Flux (Photosynthetic Photon Flux) refers to the number of micromoles of photons emitted per second from an artificial light source in the 400-700nm wavelength band, and the unit is umol/s.
PPFD:
Photosynthetic Photon Flux Density (Photosynthetic Photon Flux Density) corresponds to PPF is the number of micromoles radiated by the light source per square meter per second, the unit is umol/m2s, which is the concept of density.
PPFD is the PPF expressed in one square meter.
PPFD is a physical quantity related to the radiation distance, which is inversely proportional to the square of the radiation distance.
1PPFD means that 1 micromole of photons per second radiates on a surface of 1 square meter.
How big is 1umol/m2s (PPFD)? It means that there are 6 photons in 10 square nanometers.
YPF:
The yield of photon flux (Yield Photon Flux) refers to the number of micromoles of photons radiated per second in the wavelength range emitted by the artificial light source, and the unit is umol/s. The generally considered wavelength band is 360-760nm. For LED light sources, the wavelength range is set to 380-800nm.
YPFD:
The resulting photon flux density (YieldPhotonFluxDensity), corresponding to YPF is the number of micromoles of radiation per square meter per second, in umol/m2s, which is the concept of density.
YPFD means YPF in the range of one square meter.
YPFD is a physical quantity related to the radiation distance, which is inversely proportional to the square of the radiation distance.
YPFD can more accurately express the light quantity of LED plant light quality.
The difference between PAR and PPFD, PAR is a physical concept, and the unit of this physical concept of PPFD.
The relationship between PPFD and PPF: PPFD is the basic quantity derived from planting process parameters, and PPF is the main parameter for lamp manufacturing.