Photosynthetically Active Radiation (PAR) is the range of light wavelengths that plants use for photosynthesis, typically 400-700 nanometres.
Also called / Category:
Light spectrum / Environment, Media & Nutrition
Key takeaways:
- PAR is crucial for plant growth and development.
- It can be measured with a PAR meter or light sensor.
- Understanding PAR helps optimize cannabis cultivation environments.
- Different light sources emit varying levels of PAR.
What it is / How it shows up:
PAR is often mentioned in cannabis grow guides, equipment specifications, and scientific discussions about plant growth. It represents the specific range of light wavelengths that plants use for photosynthesis, which is between 400 and 700 nanometres. Light within this range is essential for the conversion of carbon dioxide and water into glucose and oxygen, thus driving plant growth. Growers assess PAR when selecting lighting systems to ensure that their cannabis plants receive optimal light for photosynthesis, ultimately affecting yield and quality.
How it’s measured or identified:
- Using a PAR meter to measure the intensity of photosynthetically active radiation.
- Checking equipment specifications for light systems.
Use in context:
- Growers adjust lighting systems to maximize PAR for their cannabis plants.
- High PAR values are often associated with more robust plant growth.
- Understanding PAR helps growers choose the right lighting conditions.
Safety & compliance in Canada:
- Ensure lighting systems comply with Canadian safety standards.
- Monitor energy consumption to align with environmental regulations.
Related terms / See also:
FAQs:
What is the ideal PAR for cannabis cultivation? The ideal PAR for cannabis varies, but it is generally recommended to aim for 400-700 µmol/m²/s during the vegetative and flowering stages.
How does PAR affect cannabis yields? Adequate PAR levels enhance photosynthesis, which can lead to increased plant growth and higher yields.
Sources:
- offset-4 transition-colors hover:underline" title="Learn more about Health Canada">Health Canada
- PubChem