Tunable LED Lamp Recalibration via Spectral Feedback
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Solution Overview
Problem
Conventional lighting systems, including LED-based systems, face challenges in maintaining consistent color quality and energy efficiency over time due to degradation of light sources, which affects color temperature and rendering index, leading to reduced performance metrics like brightness and CRI.
Innovation Solution
A tunable LED-based lamp system with a color mixing plan generated pre-deployment, utilizing a model builder system to create a spectral analysis map and thermal model, allowing for real-time recalibration and optimization of light characteristics through a controller and mobile app, ensuring consistent performance by adjusting driving conditions and coefficients based on degradation levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If LED light sources are used to achieve long life and high energy efficiency, then duration of action and energy efficiency are improved, but color quality and spectral characteristics degrade over time
Solution Approach 1:
The system performs preliminary characterization of each LED lamp's spectral characteristics during manufacturing. A spectral analysis map is created that stores baseline spectral data for each lamp, enabling future recalibration based on measured degradation from these known initial states.
Solution Approach 2:
The system continuously monitors spectral characteristics of LED lamps during operation and compares them against the stored baseline data. When degradation is detected, the system automatically recalibrates by adjusting driving currents to compensate for the changes, maintaining consistent color quality throughout the lamp's life.
2Ease of manufacture
If conventional light sources are used, then ease of manufacture and initial color quality are maintained, but energy efficiency and duration of action are poor
Solution Approach 1:
The system dynamically adjusts electrical parameters (driving currents) of LED lamps based on their measured spectral characteristics. By changing these parameters in response to degradation, the system maintains optimal color quality and energy efficiency throughout the operational life of the lamps.
3Illumination intensity
If LED driving currents are increased to maintain brightness, then illumination intensity is improved, but heat generation and acceleration of degradation increase
Solution Approach 1:
Instead of uniformly increasing current to all LEDs, the system adjusts individual lamp currents based on their specific degradation characteristics measured from spectral analysis. This targeted approach maintains brightness while minimizing unnecessary current increases that would generate excess heat.
Solution Approach 2:
The system dynamically adjusts driving currents in real-time based on measured spectral characteristics rather than using fixed current levels. This allows optimization of brightness while managing heat generation by adapting to actual lamp conditions.
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 system maintains optimal color temperature and CRI, improving brightness and overall performance by recalibrating the color mixing plan, thus extending the life of the light module and maintaining user-specified spectral characteristics.
Implementation Method 1
A light source can be characterized by its color temperature and by its color rendering index ("CRI").
Implementation Method 2
A tunable LED-based light module can include a first LED of a first color, a second LED of a second color, and a phosphor.
Data Source
AI summary
Some embodiments include a method of operating a tunable light module. The method can include driving a lamp in the tunable light module, having lamps of at least two colors, to produce a colored light according to the color mixing plan that corresponds to a correlated color temperature (CCT); measuring a light characteristic of the lamp using a light sensor; detecting a degradation level by comparing the measured light characteristic against an expected light characteristic; and adjusting a current level for driving the lamp at the CCT by referencing the color mixing plan and an alternative coefficient corresponding to the degradation level.