What Color is Best for Plant Growth (Collaboration with Shane Torpey from MIGRO)
Professor DeBacco

The optimal PAR (Photosynthetically Active Radiation) intensity for plants can vary depending on the specific plant species and its growth stage.

Photosynthetically Active Radiation PAR
PAR is the range of light wavelengths (usually measured in the 400 to 700 nanometer range) that plants use for photosynthesis.

PAR intensity vs growth rate
Medicinal herbs can utilise high PAR intensity and growth rate increases at a high rate up until about 800 µmols/m²/second, after which the rate of growth reduces and the system is less efficient. This is why most grow light manufacturers design grow lights to deliver an average PAR of about this level.

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