What Light Spectrums are Best for Cannabis?
Cannabis cultivation requires an elevated level of care due to the diversity of the species and the demand for premium products. To maximize the potential of your cannabis seeds, you need intent, which includes optimizing your light spectrum according to the stages in your plant’s lifecycle.
Light Spectrum and Cannabis Research
A study conducted by scientists at the Research Centre for Cereal and Industrial Crops in Rovigo, Italy, found that the light spectrum significantly influences cannabinoid content. The researchers compared HPS and LED lights to determine differences in stem height, flower yield, and cannabinoid content.
The study found that " the manipulation of the spectrum, an advantage of LED technology, offers better space utilization to support the heating and cooling loads of growing buildings. LED lighting strategies may be applied to improve the energy utilization and carbon footprint of cannabis crops.”
Different Light Spectrums During the Cannabis Lifecycle
Light spectrum plays a critical role in plant development. As a result, we highly suggest using the best light spectrums for your cannabis plants.
Below, we’ve outlined the best light spectrums for each stage of development.
Seedling - Blue light spectrum 400-500nm (nanometers)
Seedlings require strong stem development for a sturdy base.
Vegetative Stage - Blue light spectrum 400-500nm
Blue light promotes strong stem and foliage growth, both essential in the vegetative stage. At 460nm, your plants will naturally begin to broaden their leaves.
Flowering – Red light spectrum 620-740nm
During flowering, it's essential to promote bud and resin development. Red light encourages plants to focus their inner energy on diverse cannabinoid production.
Light Intensity
Light intensity, or PPFD, is also essential for plant development and specific to each grow cycle. PPFD is the amount of light reaching your plants. Too little light will not allow your plants to grow, and too much will cause burn damage.
Aim for a PPFD of 300-600 μmol/m²/s in the vegetative stage and 800 to 1500 µmol/m2/s during flowering.
How to Measure Light Spectrum
While advanced LED lighting systems allow growers to set the light spectrum, we recommend taking measurements to ensure accuracy. The best tool is a spectroradiometer, but you can also use other devices like a PAR meter, and there are even phone apps that calculate the light spectrum with decent accuracy.
Trilogene Seeds – Premium Seeds Diverse Genetics
For more essential grow information, be sure to check out other posts on the Trilogene blog if you are interested in cannabis seeds, check out our diverse range of genetics available to purchase online. Please feel free to reach out if you have questions. Our team has decades of experience cultivating premium cannabis.
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