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Light: Difference between revisions
→Horticultural light metrics
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== Horticultural light metrics ==
There are many different metrics that can be used to measure the intensity and quality of light for photosynthesis in the cultivar
=== PAR ===▼
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The measure of photons per second produced by a light. Photons are measured in micro (10^-6) [https://en.wikipedia.org/wiki/Mole_(unit) moles] there are a huge amount of photons coming from any light source. One µmol is actually 602 quadrillion photons. Simply put this metric is the intensity per second from a light
=== PPFD ===
Photosynthetic Photon Flux Density its unit is μmol/m^2/s. This is the PAR per meter squared, so it incorporates the area of photons that a horticultural light produces. This is important to note when buying a growing light, for example, light A may provide a PAR of 800 μmol/s in a 1m^2 area while light B provides the same PAR in a 4m^2 area. Light B provides the same intensity but over a larger area, so it can support a larger plant. In this case, light B has a greater PPFD
== Horticulural light terms ==
▲=== PAR ===
PAR stands for Photosynthetic Active Radiation, light within the range of 400 to 700 nanometers that drives photosynthesis. For reference, the human eye can see light between 380 to 750 nm.
==Types of lighting ==
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