Light Emitting Module With Seven LED Sources For High Color Rendering
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Solution Overview
Problem
Existing light emitting modules achieve high color rendering only at low correlated color temperatures and in a narrow range, failing to provide effective color rendering at higher temperatures or wider ranges.
Innovation Solution
A light emitting module comprising a first light source, a second light source, and five colored light sources, each emitting light at specific luminescence intensity ratios to achieve a correlated color temperature of 5000K to 6500K with high general and special color rendering indices, utilizing a combination of light modulation control methods like FM, PWM, and DC modulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional light emitting module uses a limited number of light sources, then the device complexity is low, but the color rendering index and correlated color temperature range are restricted
Solution Approach 1:
The light emitting module segments the light source system into seven independent light sources (first light source, second light source, and five colored light sources emitting different wavelengths). Each light source can be independently controlled to emit at specific luminance levels, enabling precise adjustment of the mixed light's correlated color temperature and color rendering properties across a wide range from 2000K to 20000K.
Solution Approach 2:
The system implements dynamic control of each light source's luminance level through independent adjustment mechanisms. By dynamically varying the luminance contribution of each light source, the module can adaptively produce mixed light with different correlated color temperatures and maintain high color rendering indices across the entire operating range, transforming a static system into a dynamically adjustable one.
2Manufacturing precision
If light emitting modules use fewer light sources, then the manufacturing cost and device complexity are reduced, but the color rendering performance at high correlated color temperatures deteriorates
Solution Approach 1:
Different light sources are assigned specific spectral characteristics and functional roles: the first light source provides warm white light for low color temperature regions, the second light source provides cool white light for high color temperature regions, and the five colored light sources fill specific spectral gaps. This local specialization of each light source's function enables high color rendering performance across the entire correlated color temperature range by optimizing the contribution of each component.
Solution Approach 2:
The system combines seven different light source types with distinct spectral characteristics into a composite light emitting system. This composite approach integrates multiple spectral components (warm white, cool white, and five colored lights) to create a unified output that achieves high color rendering indices (Ra≥95, R9≥90, R12≥85) across a broad correlated color temperature range, leveraging the complementary strengths of each light source type.
3Manufacturing precision
If the luminescence intensity of colored light sources is increased to improve color rendering, then the color rendering index improves, but the energy consumption increases
Solution Approach 1:
The system applies partial action by selectively activating only the necessary light sources and adjusting their luminance levels according to the target correlated color temperature. Rather than operating all seven light sources at maximum intensity simultaneously, the control mechanism adjusts each light source's contribution to achieve the desired spectral composition with minimal energy consumption, avoiding excessive action while maintaining high color rendering performance.
Solution Approach 2:
The system dynamically changes the luminance parameter of each light source based on the target correlated color temperature and desired color rendering performance. By optimizing the luminance distribution across the seven light sources for different operating conditions, the system achieves high color rendering indices while minimizing total energy consumption, adapting the energy input parameters to match the actual lighting requirements.
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 module achieves high color rendering indices (Ra ≥ 98, R9 ≥ 98, R12 ≥ 94) across a wide range of correlated color temperatures (5000K to 6500K), enabling efficient and effective light emission with improved color rendering.
Implementation Method 1
a first light source that emits light having a first correlated color temperature, a second light source that emits light having a second correlated color temperature higher than the first correlated color temperature, and five types of colored light sources, each capable of emitting light having a different emission light color
Data Source
AI summary
A light emitting module includes 7 colors (2700K 5700K, violet, blue, cyan, lime, and red) of LEDs. With the light emitting module, by causing each of the 7 colors of LEDs to emit at a predetermined intensity, it is possible to emit high color rendering mixed light that has a correlated color temperature from 5000 to 6500K corresponding to the color temperature of daylight, and that can achieve an average color rendering index Ra and a special color rendering index R9 of 98 or greater (99), and a special color rendering index R12 of 94 or greater.