Color Temperature Lighting Control for Melanopic Ratio Tuning
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Solution Overview
Problem
Conventional lighting systems do not adequately consider the influence on human circadian rhythms and melanopic effects, which are crucial for creating a healthy indoor environment as per the WELL Standard.
Innovation Solution
A lighting device comprising at least three light emitting devices with different chromaticity coordinates, allowing for control of color temperature within a specific range to optimize melanopic ratio and circadian response, using nitride semiconductors and fluorescent materials to emit light along the black body radiation locus.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional lighting systems are used, then good luminous efficiency and high color rendering properties are achieved, but the influence on human circadian rhythms is not adequately considered
Solution Approach 1:
The lighting system is divided into multiple independent light emitting devices with different chromaticity coordinates (first, second, and third light emitting devices). Each device can be controlled independently to adjust the overall color temperature and melanopic ratio, enabling separate optimization of circadian impact and color rendering properties
Solution Approach 2:
The patent combines multiple light emitting devices with different spectral characteristics to create a composite lighting system. This composite approach allows the system to achieve both high color rendering (Ra≥80) and significant melanopic ratio variation (≥0.35) across the color temperature range, simultaneously addressing color rendering requirements and circadian rhythm considerations
2Object-affected harmful factors
If lighting systems focus on color rendering properties, then high color rendering index is achieved, but melanopic ratio control for circadian rhythm is insufficient
Solution Approach 1:
Each light emitting device is designed with specific chromaticity coordinates that serve multiple functions: the first device (x1≤0.15, y1≤0.25) contributes to both color temperature adjustment and melanopic ratio control, the second device (x2≥0.45, y2≤0.55) provides color rendering and color temperature stabilization, while the third device (x3≤0.60, y3≥0.40) enhances color rendering and adjusts the overall spectral distribution. This multi-functional design enables the system to achieve both circadian rhythm control and high color rendering with a manageable number of components
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 lighting device effectively changes the melanopic ratio over a wide color temperature range, enhancing the circadian rhythm influence and providing a healthier lighting environment while maintaining comparable luminous efficiency and color rendering properties.
Implementation Method 1
first light emitting device (101), second light emitting device (102), and third light emitting device (103), respectively, emit lights with different chromaticity coordinates
Implementation Method 2
using nitride semiconductors and fluorescent materials to emit light along the black body radiation locus
Data Source
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AI summary
Provided is an illumination in consideration of influence on a human body. A lighting device including a first light emitting device that emits light of first chromaticity coordinates and has a high melanopic ratio, a second light emitting device that emits light of second chromaticity coordinates, and a third light emitting device that emits light of third chromaticity coordinates and has a low melanopic ratio, wherein light in a range from a first temperature to a second temperature on the black body radiation locus is included in a triangular area surrounded by a straight line connecting the first chromaticity coordinates and the second chromaticity coordinates, a straight line connecting the second chromaticity coordinates and the third chromaticity coordinates, and a straight line connecting the third chromaticity coordinates and the first chromaticity coordinates, in the chromaticity diagram of the CIE1931 color system.