Multi-Channel LED Lighting for High Color Rendering and Circadian Control
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Solution Overview
Problem
Existing LED lamps face challenges in providing white light across a range of correlated color temperatures (CCT) while maintaining high efficiency, luminous flux, good color rendering, and color stability, particularly in achieving desirable circadian performance and controlling circadian effects.
Innovation Solution
The use of semiconductor light emitting devices comprising multiple LED strings with associated luminophoric mediums, including red, blue, short-blue-pumped cyan, and long-blue-pumped cyan channels, along with a control circuit to adjust color points within specific regions on the 1931 CIE Chromaticity diagram, allowing for tunable white light generation with high color rendering indices and circadian performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple LED strings with different color channels are used to achieve high color rendering and circadian performance across a range of CCT values, then color rendering index and circadian performance are improved, but device complexity increases
Solution Approach 1:
The lighting device is divided into multiple LED strings, each emitting light of a different color channel (red, blue, cyan, yellow, violet). Each string can be independently controlled to achieve desired color rendering and circadian performance while maintaining modularity that manages complexity.
Solution Approach 2:
The control circuit is designed to universally manage multiple LED strings with different color channels, enabling the system to achieve various CCT values, color rendering indices, and circadian performance metrics through a single integrated control mechanism rather than separate systems for each function.
2Reliability
If multiple LED strings with different color channels are used to achieve high color rendering and circadian performance across a range of CCT values, then circadian performance is improved, but device complexity increases
Solution Approach 1:
The lighting device is divided into multiple LED strings, each emitting light of a different color channel (red, blue, cyan, yellow, violet). Each string can be independently controlled to achieve desired color rendering and circadian performance while maintaining modularity that manages complexity.
Solution Approach 2:
The control circuit adjusts the intensity and spectral composition of each LED string to dynamically change the overall light output characteristics, enabling the system to achieve various CCT values, color rendering indices, and circadian performance metrics through parameter adjustment rather than hardware changes.
3Adaptability or versatility
If LED lamps are designed to provide white light across a range of correlated color temperatures, then adaptability is improved, but maintaining high efficiency and luminous flux becomes difficult
Solution Approach 1:
The lighting device dynamically adjusts the intensity of each LED string based on the desired CCT value. The control circuit optimizes the combination of color channels to maintain high luminous efficacy across the entire CCT range by actively managing which LEDs are activated and at what power levels.
Solution Approach 2:
The control circuit adjusts the intensity and spectral composition of each LED string to dynamically change the overall light output characteristics, enabling the system to achieve various CCT values, color rendering indices, and circadian performance metrics through parameter adjustment rather than hardware changes.
4Adaptability or versatility
If LED lamps are designed to provide white light across a range of correlated color temperatures, then adaptability is improved, but maintaining good color rendering becomes difficult
Solution Approach 1:
The lighting device is divided into multiple LED strings, each emitting light of a different color channel (red, blue, cyan, yellow, violet). Each string can be independently controlled to achieve desired color rendering and circadian performance while maintaining modularity that manages complexity.
Solution Approach 2:
The control circuit adjusts the intensity and spectral composition of each LED string to dynamically change the overall light output characteristics, enabling the system to achieve various CCT values, color rendering indices, and circadian performance metrics through parameter adjustment rather than hardware changes.
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
Enables the generation of white light with high color rendering indices and circadian performance across a range of CCT values, providing improved lighting performance and control over circadian effects.
Implementation Method 1
semiconductor light emitting devices comprising first, second, third, and fourth LED strings, with each LED string comprising one or more LEDs
Implementation Method 2
each LED string comprising one or more LEDs having an associated luminophoric medium
Data Source
AI summary
The present disclosure provides lighting systems, which may be semiconductor light emitting devices, with two or more of blue, red, short-blue-pumped cyan, long-blue-pumped cyan, yellow, and violet channels. The lighting systems can have a plurality of operational modes that provide different biological effects while having good color rendering capability. The yellow and violet channels can include violet LEDs and be used in operational modes that provide white light with lower EML values relative to operational modes using three or more of the blue, red, short-blue-pumped cyan, and long-blue-pumped cyan color channels. The yellow, red, and violet channels can be used in an operational mode to provide low EML values while providing white light between about 1800K and about 3500K CCT.