What light intensity is best for growing cannabis?
Best insight from top research papers
The optimal light intensity for growing cannabis depends on the specific stage of growth and desired plant characteristics. During the vegetative stage, a photosynthetic photon flux density (PPFD) of approximately 900 µmol·m−2·s−1 is recommended for compact, robust plants, while a PPFD of around 600 µmol·m−2·s−1 promotes taller plants with longer internodes and increased airflow . For the flowering stage, increasing canopy-level PPFD up to 1,800 µmol·m−2·s−1 can linearly increase dry inflorescence yield and improve harvest index, resulting in higher-quality marketable tissues . Additionally, yields increase linearly with light intensity up to at least 1500 μmols/m2·s, regardless of spectrum quality differences across lamps . However, there is no commercially relevant benefit of adding supplemental UV radiation to indoor cannabis production in terms of yield or potency .
Answers from top 5 papers
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| Papers (5) | Insight |
|---|---|
25 Citations | The paper does not provide a specific answer to the question of the best light intensity for growing cannabis. |
1 Citations | The paper does not provide a specific answer to the question of what light intensity is best for growing cannabis. |
| The paper provides information on the effects of different light intensities on cannabis growth during the vegetative stage, but it does not explicitly state the best light intensity for growing cannabis. | |
| The paper states that high light intensities (LI) can substantially increase cannabis yield, but it does not specify the best light intensity for growing cannabis. | |
11 Mar 2021 | The paper states that increasing light intensity from 350 to 1400 μmol m-2 s-1 resulted in an increase in cannabis yield and quality. However, it does not specify the "best" light intensity for growing cannabis. |
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