Tunable LED Grow Light Spectral Control
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Solution Overview
Problem
Conventional grow lights fail to optimize light wavelengths for plant growth, as they often lack green light and cannot adjust to specific plant species' absorption needs, leading to inefficient energy use and unattractive lighting for humans.
Innovation Solution
A tunable lighting system with a controller that adjusts the spectral power distribution of red, blue, and green LEDs to match plant absorption spectra, providing high fluxes of photosynthetic active radiation while maintaining a desirable color temperature and high color rendering index, and incorporating sensors to monitor light saturation and adjust emissions accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional grow lights use only red and blue LEDs to match plant absorption peaks, then plant growth efficiency is improved, but color rendering for human vision deteriorates (appears purple and unattractive)
Solution Approach 1:
The patent applies local quality by providing different spectral characteristics in different wavelength regions: red and blue LEDs provide high-intensity light matching plant absorption peaks for growth efficiency, while green LEDs provide supplemental light in the 500-570nm range to improve color rendering and visual appeal for human observers, allowing each wavelength region to serve its specific function optimally
Solution Approach 2:
The patent uses composite materials principle by combining multiple LED types (red, blue, and green LEDs) into a single grow light system, creating a composite light source that delivers both the scientifically optimized red-blue spectrum for plant photosynthesis and additional green wavelengths for improved human visual perception and color rendering
2Ease of manufacture
If conventional grow lights use fixed spectral output, then manufacturing simplicity is maintained, but adaptability to different plant species and growth stages deteriorates
Solution Approach 1:
The patent implements dynamics by making the spectral output adjustable and reconfigurable through independent control of red, blue, and green LED channels, allowing the system to dynamically adapt its emission spectrum to match the specific absorption characteristics of different plant species and growth stages while maintaining a relatively simple manufacturing process using standard LED components
Solution Approach 2:
The patent applies universality by designing a multi-functional LED array that can serve multiple plant species and growth requirements through selective activation of different LED combinations, enabling a single device to replace multiple specialized grow lights while maintaining ease of manufacture using commercially available LED modules
3Productivity
If conventional grow lights emit high intensity light continuously, then plant growth rate is improved, but energy efficiency deteriorates due to lack of saturation control
Solution Approach 1:
The patent implements feedback by incorporating sensors that monitor plant light absorption and saturation levels, using this information to dynamically adjust the intensity and spectral composition of emitted light, thereby maintaining high plant growth rates while avoiding energy waste from oversaturation and enabling pulsed or intermittent lighting regimes
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system enhances plant growth efficiency, reduces energy waste, and provides an attractive and realistic visual appearance by optimizing light emission based on plant species and growth stages, achieving higher yield photon flux and color rendering indices compared to conventional grow lights.
Implementation Method 1
Use of light-emitting diodes (LEDs) and related solid-state lighting (SSL) as potentially viable alternative lighting technologies for grow lights is gaining attention in the art
Implementation Method 2
because each plant pigment absorbs light at one or more specific wavelengths, and the areas of peak absorption for each pigment are narrow
Data Source
AI summary
A lighting system with selectable emission characteristics may include a housing, a controller, a first plurality of light sources operatively coupled to the controller and carried by the housing, and a second plurality of light sources operatively coupled to and controlled by the controller and carried by the housing. The first and second pluralities of light sources may be operable to emit first and second combined lights, respectively, and to emit a first light having a wavelength within the range of 650 nanometers to 700 nanometers, a second light having a wavelength within the range of 500 nanometers to 570 nanometers, and a third light having a wavelength within the range of 430 nanometers to 470 nanometer. The second light may be characterized by a human photopic response of greater than 0.0 and less than 0.4 throughout the range from 500 nanometers to 570 nanometers.