Engineering Better Crops with Targeted Horticulture LEDs
New Tech Tuesdays
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Published March 31, 2026
Deep underground in old subway tunnels, inside industrial warehouses, and even in shipping containers tucked into major cities, crops are being grown far from sunlight and soil. This is controlled environment agriculture (CEA), where vertical farms and advanced greenhouses are changing how produce is grown.
The growth of indoor farming is being driven by pressures such as limited land and water resources and expanding cities. Indoor farming offers a way to grow fresh produce year-round in fully managed conditions. The success of these indoor farms depends on technology at every level. Among the most critical is lighting. In most vertical farm setups, crops are stacked in multiple layers, and artificial light is the primary energy source for growth. Lighting technology also accounts for a large share of operating costs in these setups. This week’s New Tech Tuesdays focuses on how horticulture lighting boosts photosynthesis and crop yield in vertical farms.
Lighting Designed for Plant Development
Plants respond to light differently than humans do. While white light may appear bright to the eye, photosynthesis depends heavily on specific wavelengths within the visible spectrum. Modern horticulture light-emitting diodes (LEDs) are designed to emit light at specific wavelengths that improve photosynthetic efficiency and promote healthy plant development across different growth stages, including flowering and branching.
The advantages of LEDs allow growers to tailor their lighting based on different crops and where the plant is in its lifecycle. Instead of wasting energy on wavelengths that offer minimal benefit, horticulture systems can prioritize the light that plants respond to most.
Why Photo Red Matters
One of the most important wavelengths in horticulture lighting is deep red light in the Photo Red region, typically around 660nm. This wavelength closely matches the peak absorption of chlorophyll a, which is why it has a strong impact on photosynthesis and plant development.
For designers of vertical farming systems, Photo Red LEDs are one of the simplest ways to improve efficiency. In multi-layer installations, lighting is often the main source of energy consumption, which means that even small improvements in LED performance can significantly reduce operating costs over time.
The environment in these controlled spaces is surprisingly harsh on the technology that powers them, so component reliability is also essential. Greenhouses and controlled agriculture environments may expose electronics to sulfur compounds, humidity, and corrosive agents from fertilizers and treatments. LEDs need to maintain their output for long periods of continuous operation in these challenging conditions.
The Newest Products for Your Newest Designs®
Cree LED's XLamp® XP-L Photo Red LEDs (Figure 1) are engineered specifically for horticulture lighting applications requiring high output at precise wavelengths. Optimized for emission wavelengths near 660 nm, these LEDs provide the Photo Red spectrum needed to maximize photosynthetic effectiveness while minimizing wasted energy.
Figure 1: Cree LED XLamp XP-L Photo Red S-Line LEDs are designed for next-generation horticulture luminaires. (Source: Mouser Electronics)
The XP-L platform delivers high radiant efficiency in a compact footprint, supporting dense LED arrays and uniform illumination in vertical farms and greenhouse systems. In addition, XLamp XP-L Photo Red LEDs are designed with materials that provide resistance to sulfur and other corrosive gases, helping ensure long-term reliability in harsh and demanding agricultural environments.
These LEDs handle heat well and fit into common lighting architectures, so engineers can design scalable fixtures without reworking the entire system.
The Next Phase of Indoor Farm Lighting
Components like XLamp XP-L LEDs solve current efficiency challenges and help pave the way for CEA lighting to take on smarter, more adaptive roles. Today, growers and engineers are looking for more ways to tie lighting into broader automation and control systems rather than treating lights as static fixtures.
Some of the emerging systems use sensors and machine learning (ML) tools to adjust lighting in real time based on crop and environmental data. Research shows that combining sensors and automation controls can improve energy efficiency and help crops respond to light patterns that mimic natural conditions.[1] Other scientific work is looking at dynamic lighting regimes where intensity or spectrum shifts throughout a day or growth phase as a way to boost efficiency and quality without increasing total energy use.[2]
Tuesday’s Takeaway
Lighting remains one of the most important aspects of controlled environment agriculture. Targeted wavelengths like Photo Red allow today's systems to deliver light more efficiently, improving crop performance and reducing wasted energy.
The next step is already underway. Lighting that adjusts based on sensor data and environmental feedback instead of fixed schedules. Over time, this can change how lighting is designed and deployed in indoor farms.
Sources
[1]https://www.sciencedirect.com/science/article/pii/S2405844024110298
[2]https://www.sciencenews.org/article/smart-lighting-vertical-farming