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Vertical Growers

What's the Proper Veg PPFD for Grow Lights?

Determining the ideal Photosynthetic Photon Flux Density (PPFD) for your grow lights is a nuanced process that hinges on your specific cultivation goals. Recent studies recommend a PPFD range of 600 - 900 (in VEG) or even higher, exceeding 1000 PPFD, particularly for those cultivating compact plants, as is often the case with vertical growers. You can delve into the detailed study on this topic here.

If your aim is to maintain compact plants, especially during the pre-flowering stage, employing a blue-enhanced spectrum, such as the Mammoth Veg Series, coupled with intense lighting, can be instrumental in optimizing plant morphology and promoting the development of additional bud sites.

Regrettably, not all lighting companies provide clear recommendations for the right PPFD targets. This discrepancy may stem from various factors - their lights might lack the necessary brightness, they may not stay abreast of the latest academic research, or they may cater primarily to novice growers. At Mammoth Lighting, our commitment is to furnish well-researched insights that maximize plant growth, serving the needs of both experienced and professional growers.

We take pride in collaborating with some of the world's largest vertical growers, enabling us to share valuable research and analysis with you - and it's all accessible at no cost. We trust you will find it invaluable.

Light Intensity, Spectrum, and Plant Morphology

Light intensity stands out as one of the most pivotal environmental factors influencing plant growth. Numerous studies have established a linear relationship between cannabis yield and light intensity. However, it's crucial to recognize that light spectrum plays a significant role in shaping plant morphology and influencing cannabinoid production. With the right light intensity, we can manipulate plant morphology to achieve desired results.

For vertical growers or those with limited space, it is advisable to subject your plants to intense light during the vegetative phase, preferably with a blue-enhanced spectrum, to maximize your available space. For a more in-depth understanding, visit our website to access the full study [link-to-full-study].

In contrast to high-intensity light, low-intensity light is often associated with photoinhibition. It's widely known that low light levels can lead to plant stretch and increased plant height.

Light Spectrum

To optimize plant growth, it's ideal to utilize a light source that combines both cool (5000K) and warm (3000K) light. The presence of blue light has an inhibitory effect on cell elongation, resulting in shorter stems and thicker leaves. Conversely, reducing the amount of blue light can lead to larger leaf surface areas and longer stems. However, an inadequate amount of blue light can have adverse effects on plant development.

Several studies have demonstrated that increasing blue light can reduce stem length, decrease leaf area, and increase leaf mass area across various crop species. On the flip side, far-red and green wavelengths have been found to induce shade avoidance syndrome symptoms, including stem and leaf elongation and premature flowering.

In the case of cannabis, plants grown under LED lights were shorter and more compact compared to those grown under red HPS treatment. Previous studies have reported that plants under sole HPS light may suffer from unbalanced morphology, with excessive leaf and stem elongation due to a low R:FR ratio and low blue light emission.

Blue light plays a crucial role in regulating various morphological responses, including shoot and internode elongation, shoot dry matter, and leaf area expansion.

In conclusion, understanding the intricate relationship between light intensity and spectrum is vital for controlling plant growth and optimizing yields in indoor cultivation.