Solid State Lighting Device With Segmented Wavelength Groups
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Solution Overview
Problem
Current solid state light emitters, such as RGB lamps, struggle with low Color Rendering Index (CRI Ra) values, particularly for objects reflecting red, green, and blue colors, leading to poor color discrimination and saturation, which affects color accuracy and subtlety in illumination.
Innovation Solution
A lighting device comprising three groups of solid state light emitters with distinct dominant wavelengths: one group emitting light within the range of 430 nm to 490 nm, another within 540 nm to 575 nm, and a third within 610 nm to 640 nm, ensuring each emitter's wavelength differs by at least 70 nm, and optionally including a fourth emitter with a wavelength outside these ranges to adjust intensity for optimal color rendering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If solid state light emitters with distinct dominant wavelengths (430-490 nm, 540-575 nm, 610-640 nm) are used, then energy efficiency is improved, but color rendering accuracy deteriorates
Solution Approach 1:
The lighting device divides the spectrum into three distinct wavelength groups (430-490 nm blue, 540-575 nm green, 610-640 nm red) using separate solid state light emitter groups. This segmentation allows each group to target specific spectral regions efficiently while collectively achieving improved color rendering through their combined output.
Solution Approach 2:
Each solid state light emitter group is assigned a specific dominant wavelength range optimized for its spectral region. The blue group (430-490 nm), green group (540-575 nm), and red group (610-640 nm) each have locally optimized characteristics that, when combined, produce comprehensive spectral coverage with CRI Ra ≥ 70.
2Use of energy by moving object
If RGB lamps are used, then energy efficiency is improved, but color discrimination capability deteriorates
Solution Approach 1:
The invention changes the wavelength parameters of the solid state light emitters from traditional RGB configurations to optimized ranges (430-490 nm, 540-575 nm, 610-640 nm) with at least 70 nm separation. This parameter optimization enhances color discrimination capability while maintaining energy efficiency, achieving CRI Ra ≥ 70.
3Measurement precision
If multiple groups of solid state light emitters with different wavelengths are combined, then color rendering is improved, but device complexity increases
Solution Approach 1:
The invention merges three groups of solid state light emitters with distinct dominant wavelengths into a single integrated lighting device. The groups emitting in the 430-490 nm, 540-575 nm, and 610-640 nm ranges are combined to collectively achieve CRI Ra ≥ 70, balancing improved color rendering with manageable 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 solution achieves a CRI Ra of at least 70, maintaining light within ten MacAdam ellipses of the blackbody locus, providing improved color accuracy and vibrancy across various colors, especially for cyan, magenta, and yellow materials.
Implementation Method 1
Solid state light emitters (e.g., light emitting diodes) are receiving much attention due to their energy efficiency
Implementation Method 2
each solid state light emitter in the first group of solid state light emitters emitting light having a dominant wavelength within a range of from about 430 nm to about 490 nm
Data Source
AI summary
A lighting device comprising first, second and third groups of solid state light emitters, the first group emitting light having a dominant wavelength of 430 to 490 nm, the second group at 525 to 575 (in some devices 540 to 575 nm), the third group at 610 to 640 nm. In some devices, wavelength of light from emitters in first and second groups, and light from second and third groups, differs by at least 70 nm. Some devices emit light having CRI Ra of at least 70 when first, second and third groups of emitters are illuminated. Also, a lighting arrangement comprising first, second and third groups as above, in addition to a fourth emitter emitting light of dominant wavelength outside the ranges for the first, second and third groups, and not more than 10 nm different from a dominant wavelength of a color on an item to be illuminated.