Stage Light Fixture CRI Adjustment via Dual LED Chip Sets
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Solution Overview
Problem
Existing stage light fixtures cannot freely adjust their color rendering index (CRI) while maintaining brightness, as they typically have fixed modes with high or low CRI, failing to balance both factors effectively.
Innovation Solution
A method involving two LED chip sets with different CRIs, where the relative spectral power distributions are normalized and adjusted using light intensity control parameters to achieve a target CRI, allowing for flexible adjustment of the color rendering index while ensuring optimal brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the color rendering index of the light source is increased, then the color rendering capability is improved, but the brightness decreases
Solution Approach 1:
The light source is segmented into multiple LED chip sets with different color rendering characteristics. Each LED chip set emits light with a specific spectral power distribution, and by independently controlling the intensity of each chip set, the system can adjust the overall spectral composition to achieve desired color rendering index while maintaining brightness through optimized combination of multiple light sources.
Solution Approach 2:
The system changes the spectral parameters of the light source by adjusting the relative spectral power distributions of different LED chip sets. By normalizing the spectral power distributions and calculating appropriate intensity control parameters, the system can dynamically adjust the color rendering index and brightness independently, resolving the traditional trade-off between these two parameters.
2Device complexity
If the color rendering index is fixed in high or low modes, then the device complexity is reduced, but the adaptability to different requirements decreases
Solution Approach 1:
The system transitions from static fixed modes to dynamic continuous adjustment. By introducing intensity control parameters for each LED chip set and using iterative optimization algorithms, the system can dynamically adjust the color rendering index to any desired value within the range, providing continuous adaptability while maintaining manageable control through automated calculation of optimal parameters.
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
Enables the stage light fixtures to achieve a desired color rendering index while maximizing brightness, by calculating and adjusting the light intensity parameters of the LED chip sets to meet specific chromaticity and color difference requirements.
Implementation Method 1
The controlled light source has a first LED chip set and a second LED chip set. The first LED chip set has a first color rendering index, and the second LED chip set has a second color rendering index.
Data Source
AI summary
A method for adjusting color rendering index of a light source and a stage light fixture are provided. The light source has a first LED chip set with a first color rendering index and a second LED chip set with a second color rendering index. The range of chromaticity differences of a target spectrum and color differences of 14 Munsell color samples of the target spectrum are defined according to a target spectral power distribution of a reference light source under a target color rending index and a target color temperature. The light intensity control parameter K1, K2 of the first LED chip set and the second LED chip set are adjusted, and a relative spectral power distribution of synthesized lighting of the controlled light source is calculated to search for values of K1 and K2 enabling the relative spectral power distribution to fall within the range.