Adaptive LED Lighting Device for Ambient Color Rendering Control
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Solution Overview
Problem
The Color Rendering Index (CRI) is inadequate for accurately measuring the color quality of solid-state lighting sources, particularly LEDs, as it does not account for chromatic discrimination and observer preferences, and is influenced by the peaked light spectrum of LEDs, leading to unfair comparisons with traditional light sources.
Innovation Solution
An LED-based lighting component that employs at least two types of LEDs and control circuitry to monitor ambient light characteristics, adjusting the color rendering metric based on the CRI of ambient light, reducing power consumption and increasing efficiency by emitting light with a lower CRI when ambient light has a high CRI, while maintaining perceived brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If LED lighting sources are designed to achieve high CRI Ra (90 or greater), then color rendering accuracy is improved, but perceived color quality may still be inadequate due to the peaked light spectrum of LEDs
Solution Approach 1:
The patent applies parameter changes by modifying the spectral power distribution of LED lighting sources. Specifically, it adjusts the relative intensities of different wavelength components (blue, cyan, green, yellow-green, yellow, orange, red regions) to optimize both color rendering accuracy and perceived color quality. This involves changing the emission parameters of multiple LED chips with different peak wavelengths to achieve a more balanced spectrum that better matches natural light characteristics.
2Use of energy by moving object
If LED lighting sources use a peaked light spectrum to improve efficiency, then energy consumption is reduced, but color rendering measurement becomes unfair compared to traditional light sources
Solution Approach 1:
The patent employs composite materials by combining multiple LED chip types with different spectral characteristics. It integrates LED chips emitting in various wavelength regions (blue, cyan, green, yellow-green, yellow, orange, red) to create a composite light source that mimics the continuous spectrum of traditional sources like incandescent or fluorescent lighting, thereby achieving fairer CRI measurements while maintaining LED efficiency advantages.
3Device complexity
If the CRI calculation uses only eight reflective samples with low to medium chromatic saturation, then measurement simplicity is improved, but ability to render highly saturated colors is not assessed
Solution Approach 1:
The patent applies dynamics by making the lighting system adaptive to different ambient lighting conditions. The control circuitry dynamically adjusts the spectral power distribution of the LED source based on detected ambient light characteristics, optimizing color rendering for varying viewing conditions. This dynamic adjustment ensures accurate color representation across different saturation levels and lighting environments.
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 allows for adaptive color rendering, improving the efficiency and power consumption of LED lighting by adjusting the color rendering metric in response to ambient light conditions, providing a more accurate representation of perceived color quality and enhancing overall system performance.
Implementation Method 1
control circuitry adapted to monitor an ambient light characteristic of ambient light
Implementation Method 2
employing at least two different types of light emitting diodes (LEDs) to generate light
Data Source
AI summary
The present disclosure relates to an LED-based lighting component that can control the color rendering capability of its generated light based on the presence or characteristics of ambient light. In one embodiment, the lighting component may employ at least two different types of LEDs to generate light. Control circuitry of the lighting component is able to monitor ambient light and drive the LEDs based on an ambient light characteristic that is indicative of the CRI of the ambient light. If the ambient light characteristic is indicative of the ambient light having a lower CRI, the control system will drive the LEDs to emit light with a defined CRI. If the ambient light characteristic is indicative of the ambient light having a higher CRI, the control system will drive the LEDs to emit light with a reduced CRI, which is lower than the defined CRI.