Why Your Plants Need Under Canopy LED Grow Lights: Setup Guide & Usage Tips

What Is an under canopy LED Grow Light?

Using an Under Canopy LED Grow Light is also called Under Canopy Lighting or Subcanopy Light (SCL). Unlike traditional hanging grow light, it is installed below the plant canopy and sends light upward. It works as supplemental lighting and helps solve light penetration problems inside dense indoor plants.

Why Do Plants Need under canopy LED Grow Lights?

Improve Overall Plant Growth

Upper leaves often block light from reaching lower branches. Lower areas may experience weak growth, long internodes, and yellowing leaves. Under canopy led grow light helps activate lower leaves, improve photosynthesis, and create more balanced plant development. An experienced grower conducted a trial with an under canopy LED grow light. The results showed that plants achieved faster growth, with some plants growing up to 1 inch per day after adding under canopy led grow lights.

Increase Final Harvest Yield

Lower branches often have unused production potential. Under canopy led grow light provides additional photons to lower growth sites. Better light distribution can support more productive flower sites and improve harvest potential. 

A experiment show that under non-pruned conditions, Red-Blue SCL increased yield by 19.8%, while RGB-SCL achieved a 24.5% yield increase. Red-Blue SCL uses red and blue wavelengths for efficient photosynthesis. Its focused spectrum helps boost lower-canopy growth while controlling power consumption. RGB-SCL adds green light, which penetrates deeper into dense canopies and reaches shaded leaves and bud sites. This improves overall light utilization and delivers higher yield performance than Red-Blue SCL.

Important Tips When Using under canopy LED Grow Lights

Control Light power

Lower leaves are adapted to lower light levels. Do not run under canopy led grow lights at the same power as hanging LED grow lights. High intensity may cause light stress, leaf bleaching, and chlorophyll damage. Start with a lower power setting of  under canopy grow lights and gradually increase intensity based on plant response. The goal of under canopy lighting is to provide supplemental light to shaded areas, not to replace the intensity of top lighting.

Adjust Your Pruning Strategy

Under canopy grow lights changes traditional pruning methods. Remove weak yellow leaves, dead branches, and diseased parts. Keep healthy lower branches and strong side shoots that can benefit from supplemental lighting.

Recommended Pruning Schedule for Different Growth Stages:

Recommended Pruning Methods with Under Canopy LED Grow Lights:

Recommended Setup: NEO 780 + Hell Fire 120W Under Canopy Grow Lights

The Medic Grow NEO 780 and Hell Fire 120W under canopy grow light create a complete top-and-bottom lighting system designed to improve canopy light distribution and maximize indoor growing performance.

Optimized Light Control for Different Growth Stages

• Adjustable spectrum modes: The NEO 780 hanging LED light features two adjustable spectrum modes(V1 & F1), allowing growers to customize the spectrum output based on different growth stages. From vegetative growth to flowering, growers can select a suitable spectrum to support plant development.
• One button for all lights: With one control buttons on the NEO 780, users can easily adjust both the NEO 780 top lighting and Hell Fire 120W under canopy lighting settings. This simplifies operation and allows growers to manage the complete lighting system from one location.

Efficient and Safe Under Canopy Lighting

• Less light stress: The Hell Fire 120W under canopy grow lights use a low-power design, providing supplemental light without excessive intensity that could stress lower leaves. This helps prevent issues such as leaf bleaching and light stress while improving photosynthetic activity in shaded areas.
• Long-life design: Built with an IP65 waterproof rating, the Hell Fire 120W is suitable for humid indoor growing environments. Its durable design supports long-term operation and reliable performance throughout multiple growing cycles.

Full-Spectrum Lighting for Higher Yield Potential

The Hell Fire 120W features a full-spectrum design with red, green, and blue wavelengths. Combined with the NEO 780, it creates a more balanced light environment from the top canopy to the lower plant structure.

Red and blue wavelengths support efficient photosynthesis and plant development, while green wavelengths improves light penetration through dense foliage. When shopping for best under-canopy grow lights, many growers only focus on red and blue spectrum. However, research from sub-canopy lighting trials shows adding green light brings meaningful yield improvements for non-pruned plants. That's what Hell Fire 120W designed for: full spectrum design for higher yield.

Spectrum comparision between what you plant need and Hell Fire 120W

The magic of indoor growing starts with the best under canopy grow lights--Hell Fire 120W. Pair the NEO 780 overhead main grow light with Hell Fire 120W under canopy supplemental light to unlock plants yield benefits for your grow space. Click to explore both fixtures.👇👇

FAQs about Under Canopy LED Grow Lights

Q: What is an under canopy grow lights?
A: It is supplemental lighting installed below plants to improve lower canopy lighting.

Q: Can under canopy lights replace hanging LED grow lights?
A: No. They support the main grow light and improve light distribution.

Q: Do under canopy lights increase yield?
A: They can improve yield by increasing light availability in lower plant areas.

Q: Should I use under canopy grow lights during flowering?
A: Yes. Dense flowering canopies often benefit from additional lower lighting.