Wavelength-Converted Lighting for Accurate Aquatic Color Rendering
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Solution Overview
Problem
Aquatic organisms illuminated with existing light-emitting devices or illumination apparatuses appear differently colored when viewed indoors compared to their natural underwater environment due to discrepancies in light spectra.
Innovation Solution
A light-emitting device comprising a component-mount board with mounted LEDs, a frame, and a wavelength converter containing phosphors that convert light to mimic the spectrum of sunlight underwater, with specific peak wavelengths and intensity ratios to replicate the natural colors of aquatic organisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional light-emitting devices with broad-spectrum LEDs are used, then general illumination is achieved, but the light spectrum does not match underwater sunlight, causing aquatic organisms to appear colored differently
Solution Approach 1:
The patent segments the broad-spectrum light source into multiple narrow-band LEDs with specific peak wavelengths (405nm, 450nm, 480nm, 530nm, 630nm) that correspond to sunlight penetration peaks in water. This segmentation allows precise spectral control to match underwater sunlight conditions, resolving the contradiction between general illumination and spectral accuracy.
Solution Approach 2:
The patent applies local quality by assigning different spectral characteristics to different parts of the illumination system. Each LED group targets specific wavelength regions where sunlight penetrates water effectively, creating localized spectral enhancement that collectively reproduces the natural underwater light environment.
2Measurement precision
If multiple narrow-band LEDs with specific wavelengths are used to match sunlight spectrum, then color accuracy is improved, but device complexity increases
Solution Approach 1:
The patent achieves universality by designing a multi-functional LED array where five different wavelength LEDs serve multiple purposes: they collectively reproduce the complete sunlight spectrum, individually target specific absorption bands, and can be controlled independently for various lighting modes. This multi-functionality reduces device complexity despite using multiple LED types.
Solution Approach 2:
The patent utilizes parameter changes by varying the peak wavelengths of LEDs within specific ranges (e.g., blue LEDs at 440-480nm, green LEDs at 500-550nm) to optimize spectral matching. This parameter optimization allows flexibility in component selection while maintaining color reproduction accuracy, thereby managing device complexity.
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 device reproduces the colors of aquatic organisms accurately, making them appear vivid and lifelike, while maintaining a balanced light spectrum similar to sunlight, enhancing their visibility and promoting growth.
Implementation Method 1
a wavelength converter (6) containing phosphors (60), which convert light to first light (λ1) having a first peak wavelength (λ1) in a wavelength region of 630 to 680 nm and second light (λ2) having a second peak wavelength (λ2) in a wavelength region of 430 to 480 nm
Data Source
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AI summary
A light-emitting device emits first light having a first peak wavelength in a wavelength region of 630 to 680 nm, a second peak wavelength in a wavelength region of 430 to 480 nm, and a third peak wavelength in a wavelength region of 380 to 430 nm. The first light has, relative to a light intensity of the first light at the second peak wavelength being 1, a relative light intensity of 0.05 to 0.35 at the first peak wavelength and a relative light intensity of 0.25 to 0.45 at the third peak wavelength. The first light has a first minimum value of the light intensity in a wavelength region from 480 nm to the first peak wavelength.