9 Common Myths About Under-Canopy Lighting – Are You Being Misled?

Under-canopy lighting (UCL) is becoming an important tool for increasing crop yield and quality. However, many growers still misunderstand it and may miss out on its benefits. Today, let’s debunk these myths and help you use this technology more effectively.

Myth 1: Under-canopy lighting is only for large commercial growers

Truth: While large-scale growers may see bigger benefits, small-scale and home growers can also gain from UCL.

Whether you grow in tents, vertical farms, or small greenhouses, proper UCL can promote even growth, reduce lower leaf drop, and improve overall yield.

Myth 2: Top lighting is enough; under-canopy lighting is unnecessary

Truth: While top lighting is essential, it often cannot penetrate dense plant canopies. This leaves lower leaves and fruits in the shade, reducing their photosynthesis.

Adding UCL can activate lower leaves, improve light efficiency, and enhance plant health, leading to more uniform fruit development.

Myth 3: Under-canopy lighting causes mold and pests

Truth: Some growers worry that extra lighting may increase humidity and lead to mold or pest problems.

In reality, proper airflow, well-planned light distribution, and the right light spectrum (such as far-red light) can reduce these risks. Increased light can even prevent some plant diseases.

Myth 4: Under-canopy lighting causes light stress and burns plants

Truth: Modern LED grow lights use specific wavelengths (like 660nm red and 730nm far-red light) and generate very little heat.

Unlike traditional HID or HPS lights, LEDs provide controlled light intensity, reducing the risk of burning leaves while promoting plant growth.

Myth 5: Under-canopy lighting is only useful in the flowering stage

Truth: UCL is beneficial in all growth stages. During the vegetative stage, it helps plants grow bushier and strengthens lower branches, preparing them for better flowering. In the flowering stage, it ensures even bud development and higher yield quality.

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Myth 6: Under-canopy lighting does not affect yield

Truth: Research shows that proper UCL can significantly increase yield. Cannabis growers using UCL report over 20% higher yields, along with increased THC and terpene levels. This proves that better light distribution boosts overall crop performance.

Myth 7: Any light can be used for under-canopy lighting

Truth: Regular household bulbs and LED strips are not designed for under-canopy lighting. The best UCL should have:

  • Optimized spectrum: 660nm red, 450nm blue, and 730nm far-red light for better photosynthesis and fruiting.
  • Low heat output: Prevents overheating and plant damage.
  • Waterproof and moisture-resistant design: Suitable for greenhouses and humid environments.
  • Proper light intensity: Ideally, 50-150 μmol/m²/s to ensure effective lower leaf absorption.

Myth 8: Under-canopy lighting is just hype with no scientific proof

Truth: Many studies confirm that UCL improves plant photosynthesis and yield. Research from institutions like the USDA and universities shows that UCL enhances growth in crops like tomatoes, strawberries, and lettuce. More horticulture experts now recommend using this method.

Myth 9: Under-canopy lighting is only for cannabis growers

Truth: Although popular among cannabis growers, UCL benefits many other crops too. Tomatoes, peppers, cucumbers, strawberries, and leafy greens all thrive with UCL. UCL helps reduce shading and improve production in vertical farms and greenhouses.

Under-canopy lighting is not a gimmick; it is a proven technology. It can increase yields, improve crop quality, optimize growing conditions, and enhance overall efficiency when used correctly. Whether you are a commercial grower or a home gardener, UCL can help you grow better plants.

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