Solid-State Lighting Arrangement for Rod-Dominated Visibility
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Solution Overview
Problem
Conventional street lighting with blue/white to yellow/orange wavelengths is not optimally accommodated by the human eye in dark environments, leading to reduced visibility and loss of color perception due to the limited sensitivity of rods at low light intensities.
Innovation Solution
A solid-state light source utilizing a combination of LEDs emitting wavelengths between 500-550 nm (green light) and 560-610 nm, with a higher ratio of green LEDs to amber LEDs, to enhance rod sensitivity while maintaining color perception and contrast, and a light processing unit for adjustable light intensity and direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If street lighting uses conventional blue/white to yellow/orange wavelengths, then adequate lighting with agreeable aura is achieved, but the human eye in darkened environment is not optimally accommodated and visibility is reduced
Solution Approach 1:
The patent changes the wavelength parameter of the light source from conventional blue/white or yellow/orange to green light with dominant wavelength between 500-550 nm. This parameter change aligns the light wavelength with the peak sensitivity of human rod cells (approximately 507 nm), thereby optimizing eye accommodation and enhancing visibility in darkened environments while reducing the mismatch between light source and human visual system.
2Illumination intensity
If solid-state light source uses wavelengths from first wavelength region (500-550 nm) to enhance rod sensitivity, then sensitivity increases 2.5 times compared to 555 nm, but colour perception and contrast are lost due to lack of spectral bandwidth
Solution Approach 1:
The patent merges two previously separate lighting approaches into a single integrated solution: green light LEDs (500-550 nm) for enhancing rod sensitivity and amber light LEDs (560-610 nm) for maintaining color perception. By combining these two wavelength regions in one lighting system, the invention simultaneously achieves both high rod sensitivity (2.5 times greater than conventional 555 nm light) and preserved color/contrast information, eliminating the trade-off between sensitivity and color perception.
Solution Approach 2:
The lighting system uses a composite approach by integrating multiple LED types emitting at different wavelengths (green 500-550 nm and amber 560-610 nm) into a single illumination source. This composite light spectrum leverages the complementary strengths of each wavelength region: green light maximizes rod cell activation for enhanced sensitivity, while amber light provides sufficient spectral bandwidth for color discrimination and contrast perception, creating a synergistic effect greater than either wavelength region alone.
3Illumination intensity
If solid-state light source combines multiple LED types with different wavelengths, then both rod sensitivity and color perception are maintained, but device complexity increases
Solution Approach 1:
The patent segments the lighting function into distinct wavelength components by using separate green light LEDs (500-550 nm) and amber light LEDs (560-610 nm) that can be independently controlled. This segmentation allows each LED type to optimize its specific function (green for rod sensitivity, amber for color perception) while maintaining overall system simplicity through modular design. The segmented approach enables flexible configuration ratios and independent adjustment of each wavelength component without requiring complex integrated LED structures.
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 solution provides improved observability and color perception in dark environments with reduced energy consumption and increased visibility of contours and colors, meeting minimum street lighting requirements with a light output of at least 300 lumens.
Implementation Method 1
The solid-state light source (4) may comprise a plurality of Light Emitting Diodes (LEDs) (5)
Data Source
Figure 1
Figure 2a~2b
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AI summary
The invention relates to a lighting arrangement for illuminating a surface. The lighting arrangement has a supporting element and a lighting unit (1) which is supported by the supporting element. The lighting unit (1) has a housing (2) which is designed to accommodate a solid-state light source (4). The housing is also transparent on at least one side. The solid-state light source (4) is suitable for generating light having wavelengths from a first wavelength region and a second wavelength region. The first wavelength region comprises wavelengths of 500-550 nm. The second wavelength region comprises wavelengths of 560-610 nm. The lighting unit (1) is designed to generate light having a dominant wavelength from the first wavelength region in such a way that the eye sensitivity of the human eye is dominated by rods.