Lighting System Spectrum Configuration via Intensity Minimization
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Solution Overview
Problem
Current lighting systems composed of multiple light sources lack the ability to be dynamically configured to achieve a specific reference spectrum, such as the solar spectrum, and fail to account for ambient colorimetric contexts, resulting in suboptimal color rendering indices (CRI) especially when combining multiple sources.
Innovation Solution
A method to configure a lighting system by determining the optimal intensities of multiple light sources with different spectra to minimize the distance between a reference spectrum and a synthetic spectrum, using a least squares method and considering the sensitivity of human eye detectors, allowing for the combination of individual light sources to achieve a high CRI.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple light sources are combined to achieve a reference spectrum, then the color rendering index (CRI) is improved, but the device complexity increases due to the need to control intensities of multiple sources
Solution Approach 1:
The patent changes the parameters of the light sources by dynamically adjusting their emission intensities to match a reference spectrum. The control unit modifies the intensity parameters of each light source based on spectral measurements, enabling the system to achieve high CRI by transforming the operational parameters of existing components rather than requiring perfectly matched fixed-spectrum sources
Solution Approach 2:
The patent implements a feedback mechanism where a spectral sensor continuously measures the combined spectrum of multiple light sources, and this measurement is fed back to a control unit that adjusts the intensities of individual sources. This closed-loop control system automatically optimizes the spectral composition to match the reference spectrum, resolving the complexity issue through automated feedback-based parameter tuning
2Adaptability or versatility
If static light sources are used, then the device complexity is reduced, but the adaptability to achieve specific reference spectra is worsened
Solution Approach 1:
The patent transforms static light sources into a dynamic system by enabling continuous adjustment of their emission intensities. The control unit can dynamically modify the intensity of each light source in real-time based on spectral feedback, allowing the system to adapt to different reference spectra and ambient conditions while maintaining manageable complexity through automated control
3Measurement precision
If ambient colorimetric context is not considered, then the ease of operation is improved, but the color rendering accuracy is worsened
Solution Approach 1:
The patent implements a self-service mechanism where the lighting system automatically configures its own spectral composition without user intervention. The spectral sensor and control unit work autonomously to measure the ambient colorimetric context, calculate the required intensity adjustments, and apply the optimal configuration to match the reference spectrum, thereby achieving high accuracy while maintaining ease of operation through automation
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 method effectively combines light sources to achieve a high CRI, exceeding traditional LED limitations, with an average CRI of 96.70, demonstrating improved color rendering and adaptability across different angles.
Implementation Method 1
a lighting system including a set of at least 3 light sources having different spectra Si(λ)
Implementation Method 2
a distance between a perception PR,j(λ) corresponding to said reference spectrum and a perception Pj(λ) corresponding to said synthetic spectrum, said perceptions being considered on a set of detectors of a given observer
Data Source
AI summary
The invention relates to a method for configuring a lighting system including a set of at least 3 light sources (Li) having different spectra (Si(λ)), including a step of automatically defining the intensities (φi) of each of the light sources of said set by minimising a distance between a reference spectrum (SR(λ)) and a synthetic spectrum (Ss(λ)) defined by the sum of the spectra (Si(λ)) of each source (Li) of said set weighted by said intensities (φi).