A device used to measure Photosynthetically Active Radiation (PAR), which is the range of light wavelengths (400 to 700 nanometers) that plants use for photosynthesis. In cannabis cultivation, a PAR meter helps growers determine the intensity and distribution of light provided by grow lights, ensuring the plants receive the optimal amount of usable light for healthy growth and maximum yields.
🔊 par MEE·ter
In the Wild — Example
Using a PAR meter showed me that the edges of my canopy were getting about half the light of the center.
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