Expert System Color Model for LED Lamp CCT Tuning
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Solution Overview
Problem
Conventional lighting systems, including incandescent and fluorescent bulbs, lack long life, high energy efficiency, and consistent color quality, while LED-based systems face challenges in tuning color temperature and rendering index.
Innovation Solution
An expert system develops a color model for LED-based lamps using a color-space searching technique to adjust LED string contributions, allowing for precise control of correlated color temperature and reproduction of target light spectra, ensuring accurate color output over the lamp's life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional lighting technologies (incandescent and fluorescent bulbs) are used, then long life and high energy efficiency are achieved, but color quality consistency and selection are limited
Solution Approach 1:
The lighting system is segmented into multiple LED strings, each emitting at different wavelengths (e.g., blue, cyan, green, yellow-green, yellow, orange, red). This segmentation allows independent control of each wavelength component, enabling precise adjustment of color temperature and CRI while maintaining energy efficiency and consistent color quality over time.
2Duration of action of stationary object
If LED-based lighting systems are used, then long life and high energy efficiency are achieved, but color temperature and CRI are difficult to tune and adjust
Solution Approach 1:
The system employs dynamic control of multiple LED strings with different wavelengths through individual dimming circuits. This allows real-time adjustment of the relative intensity of each wavelength component, enabling continuous tuning of color temperature and CRI while maintaining the long life and energy efficiency of LED technology.
3Use of energy by moving object
If LED-based lighting systems are used, then high energy efficiency is achieved, but maintaining acceptable CRI while varying CCT is difficult
Solution Approach 1:
The system changes multiple parameters simultaneously by adjusting the intensity of each LED string's wavelength component. By independently controlling the drive current to each LED string, the system can vary color temperature (CCT) while maintaining color rendering index (CRI) within acceptable ranges, all while preserving the high energy efficiency of LED technology.
4Ease of operation
If conventional lighting technologies are used, then color selection is limited, but ease of manufacture and operation are maintained
Solution Approach 1:
The lighting system is divided into multiple LED strings, each emitting at different wavelengths. This segmentation enables a wide range of color selections by adjusting the intensity of individual wavelength components, while the overall system remains easy to operate through centralized control of all strings.
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 enables remote control and calibration of LED-based lamps to maintain accurate color temperature and rendering index, providing long-lasting, energy-efficient lighting with consistent color quality.
Implementation Method 1
The lamp includes a first LED string including a plurality of first LEDs having a first wavelength, a second LED string including a plurality of second LEDs having a second wavelength
Implementation Method 2
each LED string in the lamp to generate light over a range of CCTs
Data Source
AI summary
Systems and methods for using an expert system to develop a color model for and LED-based lamp for reproducing a target light and calibrating the lamp are disclosed. The CCT of light generated by the lamp is tunable by adjusting the amount of light contributed by each of the LED strings in the lamp. The target light is decomposed into different wavelength bands, and light generated by the LED-based lamp is also decomposed into the same wavelength bands and compared. A color model for the lamp provides information on how hard to drive each LED string in the lamp to generate light over a range of CCTs, and the color model is used to search for the appropriate operating point of the lamp to reproduce the target light.