Plant Cultivation Light Source Unit for Balanced Spectral Peaks
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Solution Overview
Problem
Existing plant cultivation methods using LED light sources do not efficiently enhance growth rate and functional substance content in plants, such as antioxidants, compared to natural sunlight.
Innovation Solution
A light source unit for plant cultivation utilizing at least one LED chip emitting light of 430 nm or less, combined with three types of phosphors producing a basic spectrum of white light with a color temperature of 5000K or more, ensuring uniform intensity distribution across visible wavelengths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If LED light sources are used for plant cultivation, then productivity and control over growth conditions are improved, but the ability to efficiently enhance growth rate and functional substance content compared to natural sunlight deteriorates
Solution Approach 1:
The patent applies parameter changes by carefully selecting and combining multiple LED chips with specific peak wavelengths (violet 405nm, blue 450nm, cyan 490nm, green 530nm, yellow-green 560nm, red 630nm) to replicate the spectral distribution of natural sunlight. This spectral parameter optimization enables the LED system to achieve growth rates and functional substance content comparable to or exceeding natural sunlight, while maintaining the productivity advantages of controlled LED cultivation.
2Quantity of substance
If multiple types of LED chips are combined to mimic sunlight spectrum, then the ability to enhance functional substances in plants is improved, but device complexity increases
Solution Approach 1:
The patent merges multiple LED chip types with different peak wavelengths into a single integrated light source assembly. By combining violet (405nm), blue (450nm), cyan (490nm), green (530nm), yellow-green (560nm), and red (630nm) LED chips in specific arrangements, the system replicates the full sunlight spectrum, thereby enhancing functional substance production in plants while consolidating what could be complex separate light sources into one unified device.
3Speed
If LED light sources with specific wavelength combinations are used, then growth rate enhancement is improved, but energy consumption and cost increase
Solution Approach 1:
The patent optimizes energy efficiency by carefully selecting LED chip peak wavelengths that correspond to the photosynthetically active radiation spectrum (400-700nm), particularly emphasizing wavelengths that drive both photosynthesis and functional substance production. By tuning the spectral parameters to match plant physiological needs rather than using broad-spectrum inefficient sources, the system achieves high growth rates while minimizing energy consumption per unit of biomass produced.
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
Promotes plant growth and increases functional substance content, such as antioxidants, by mimicking sunlight's spectrum, resulting in improved growth rates and substance accumulation.
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
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%.