Plant Cultivation Light Source Assembly With Sunlight-Like LED Spectrum
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Solution Overview
Problem
Current LED light sources for plant cultivation do not effectively enhance the growth rate and content of functional substances in plants, such as antioxidants, compared to natural sunlight, and lack a spectrum that mimics the beneficial effects of sunlight for plant growth.
Innovation Solution
An LED light source unit for plant cultivation that includes at least one light emitting diode chip emitting light of 430 nm or less and three types of phosphors with peak wavelengths in specific ranges (440-480 nm, 500-600 nm, and 600-650 nm), producing a white light spectrum with a color temperature of 5000K or more, which promotes uniform intensity across a wide visible region, thereby enhancing plant growth and functional substance content.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional white light sources are used for plant cultivation, then plants can grow, but the growth rate is slow and functional substance content is low
Solution Approach 1:
The patent applies local quality by using multiple LED chips emitting at different wavelengths (blue, cyan, green, yellow-green, red) to provide spectrally tailored light regions that correspond to specific plant physiological functions. Each wavelength region targets specific photoreceptors or photosynthetic processes, creating localized spectral quality optimization rather than uniform illumination.
Solution Approach 2:
The patent changes the spectral parameters of the light source by combining LEDs with peak wavelengths of 450nm, 490nm, 530nm, 560nm, and 630nm, along with phosphors having specific emission characteristics. This parameter optimization creates a customized spectrum that enhances both growth rate and functional substance accumulation.
2Adaptability or versatility
If natural sunlight is used for plant cultivation, then plants receive full spectrum light, but cultivation is limited by weather, time, and location
Solution Approach 1:
The patent replaces the natural sunlight system with an artificial LED-based lighting system that replicates and optimizes the spectral components of sunlight. This substitution enables controlled environment agriculture where cultivation is independent of weather, time, and geographic location, while maintaining or improving upon the efficiency of natural light.
3Use of energy by moving object
If single-wavelength LED lights are used for plant cultivation, then energy efficiency is improved, but overall plant growth and functional substance production are limited
Solution Approach 1:
The patent merges multiple LED chip types with different peak wavelengths (450nm blue, 490nm cyan, 530nm green, 560nm yellow-green, 630nm red) and phosphor materials into a single integrated lighting system. This combination maintains the energy efficiency of individual LED wavelengths while achieving the synergistic effect of a full spectrum light source that promotes both rapid growth and functional substance production.
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 described LED light source unit significantly increases the growth rate and content of functional substances in plants, including antioxidants, phenolic compounds, and anthocyanins, compared to conventional light sources, by providing a spectrum that mimics sunlight, leading to healthier and more nutritious plant growth.
Implementation Method 1
at least one first light emitting diode chip emitting light of 430 nm or less
Implementation Method 2
at least three types of phosphors excited by the at least one first light emitting diode chip
Implementation Method 3
Plants use light energy to photosynthesis to synthesize organic matter from carbon dioxide and water
Data Source
AI summary
A light source unit for plant cultivation includes: a first light emitter emitting a primary light and a converter disposed on a path of the primary light to produce a first light, and a second light emitter emitting a second light, wherein combined light emitted from the first light emitter and the second light emitter produces a basic spectrum including at least three peak wavelengths, with a difference between relative intensities of at least two of the peak wavelengths being less than 20%.