Plant Growth Light Source Spectral Optimization
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Solution Overview
Problem
Conventional light sources used in plant growth enclosures, such as greenhouses and growth chambers, are energy inefficient, leading to slow plant growth, low biomass production, and excessive operating expenses due to non-optimized light spectra, resulting in 'leggy' plants and high energy consumption.
Innovation Solution
The use of electrically-powered light sources emitting a specific spectral profile defined by wavelengths between 400 nm and 700 nm, with specific percentages of incident light in different ranges, to enhance photosynthetic productivity and biomass production, including wavelengths between 400-470 nm, 526-570 nm, and 626-700 nm, which can be achieved using induction lamps, metal halide lamps, or LEDs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional light sources (fluorescent, high pressure sodium, metal halide lamps) are used for artificial illumination, then plants can be grown indoors and year-round, but photosynthetic productivity is low and plant growth is slow
Solution Approach 1:
The patent applies parameter changes by optimizing the spectral distribution of light sources to match the absorption characteristics of chlorophyll and other photosynthetic pigments. Specifically, the invention uses light sources with enhanced emission in the blue (430-470 nm) and red (630-680 nm) regions where photosynthetic efficiency is highest, while reducing emission in less useful spectral regions. This spectral parameter optimization directly increases photosynthetic productivity per unit of energy consumed.
Solution Approach 2:
The patent segments the broad spectrum of light into specific wavelength bands that are most effective for different photosynthetic processes. By using multiple light sources or filters to provide discrete spectral components (blue, green, red, far-red regions), the invention targets specific photosynthetic pigments and pathways, thereby improving overall energy utilization efficiency and photosynthetic output.
2Illumination intensity
If conventional light sources are used to provide sufficient light intensity, then plants receive adequate illumination, but operating expenses are excessive due to high energy consumption
Solution Approach 1:
The patent changes the spectral parameter of light sources to achieve higher photosynthetic efficiency at lower energy consumption. By using LED arrays or filtered light sources that emit primarily in the photosynthetically active radiation (PAR) range with peak intensities at 430-470 nm and 630-680 nm, the system delivers adequate illumination intensity for plant growth while consuming significantly less electrical power than conventional broad-spectrum sources.
Solution Approach 2:
The patent replaces conventional thermal-based lighting systems (incandescent, high-pressure sodium) with solid-state LED technology or fluorescent systems with spectral filters. This substitution eliminates excessive heat generation and focuses energy delivery into the useful spectral range, reducing operating expenses while maintaining required illumination levels for plant growth.
3Loss of energy
If conventional light sources emit broad spectrum light, then all wavelengths are available, but most energy is converted to heat rather than useful photosynthesis
Solution Approach 1:
The patent optimizes the spectral emission parameters of light sources to minimize energy loss as heat. By using LED technology or fluorescent lamps with spectral filters that confine emission to the 400-700 nm photosynthetic range, the system prevents energy waste in the infrared (heat) and ultraviolet regions. This parameter optimization ensures that most electrical energy input is converted directly into useful photosynthetic radiation rather than heat.
Solution Approach 2:
The patent converts the previously harmful effect of broad-spectrum heat generation into a benefit by using selective spectral emission. The light sources are designed to emit only in the ranges absorbed by photosynthetic pigments, transforming what would have been wasted thermal energy into productive photosynthetic radiation. This approach turns the energy conversion process from a source of heat loss into a高效 photosynthetic driver.
4Productivity
If conventional light sources are used, then basic plant growth is supported, but plants become excessively leggy and spindly with poor compact appearance
Solution Approach 1:
The patent uses spectral parameter changes to control plant morphology alongside productivity. By including specific wavelength ratios of blue light (430-470 nm) which promotes compact growth and inhibits excessive elongation, alongside red light (630-680 nm) for biomass production, the system achieves both high productivity and desirable plant shape. The balanced spectral composition prevents leggy appearance while maintaining vigorous growth.
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
This approach increases photosynthetic productivity by 40-200% and harvest index by 80-120% per watt of input power compared to conventional light sources, reducing energy consumption and improving plant growth outcomes.
Implementation Method 1
Light incident on these plants provides them with the requisite energy to promote photosynthesis, which is necessary for plant growth
Data Source
AI summary
A method of growing a plant or its propagule is described. The method includes: (i) powering a light source with input power to generate an incident light; (ii) illuminating, for a period of time, a growth area of the plant/propagule with the incident light having a spectral profile defined by a first (i.e., between about 400 nm and about 470 nm), a second (i.e., between about 526 nm and about 570 nm) and a third (i.e., between about 626 nm and about 700 nm) set of wavelengths; (iii) achieving, using the incident light, a dry weight that is greater than that achieved if the growth area of the plant/propagule had been illuminated by another incident light with same amount of input power for substantially same period of time, and another incident light includes the first and the third set of wavelengths, but not the second set of wavelengths.