Dynamic Color Adjustment for Mixed Lighting Systems
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing lighting systems struggle to accurately control the chromaticity of total light in spaces that incorporate both uncontrollable natural sunlight and artificial lighting sources, as the variability in natural sunlight's chromaticity over time and location leads to inconsistencies in desired light quality.
Innovation Solution
A dynamic lighting system that employs a measurement/control system with sensors and a lighting control unit to adjust the intensity of controllable light sources based on real-time measurements of total light, using a calibration selector to optimize chromaticity adjustments by dynamically selecting the appropriate calibration table based on current light conditions, thereby maintaining consistent or desired chromaticity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If natural sunlight is used as an uncontrollable light source, then the lighting system can provide natural illumination, but the chromaticity of the total light varies considerably due to changes in sunlight conditions
Solution Approach 1:
The system employs sensors to continuously measure the chromaticity of ambient light (including natural sunlight) and feeds this information back to a control unit. The control unit dynamically adjusts the output of controllable light sources based on the measured chromaticity, creating a closed-loop feedback system that maintains consistent total light chromaticity despite variations in natural sunlight conditions
Solution Approach 2:
The system dynamically changes the operational parameters (intensity, chromaticity) of controllable light sources in response to measured ambient light conditions. By adjusting these parameters in real-time, the system compensates for chromaticity variations in natural sunlight and maintains a consistent overall chromaticity
2Stability of the object's composition
If controllable light sources are added to blend with natural sunlight, then the chromaticity can be adjusted, but the system complexity increases due to multiple light sources and control mechanisms
Solution Approach 1:
The control unit serves multiple functions: it processes sensor data, determines ambient light chromaticity, calculates required adjustments, and controls multiple controllable light sources. This multi-functionality reduces the need for separate dedicated components for each function, thereby managing system complexity while achieving chromaticity control
Solution Approach 2:
The system uses sensors as intermediaries to indirectly measure ambient light chromaticity without directly analyzing the complex spectral composition. The sensors provide simplified chromaticity data that the control unit can process efficiently, acting as a mediator between the complex natural light environment and the control system
3Stability of the object's composition
If dynamic adjustment of controllable light sources is implemented, then chromaticity consistency is maintained, but the measurement and control system complexity increases
Solution Approach 1:
The system pre-stores multiple calibration tables containing chromaticity data for different ambient light conditions (e.g., different times of day, weather conditions). When operation begins, the system selects the appropriate pre-calibrated table based on current conditions, avoiding the need for complex real-time chromaticity calculations and reducing measurement and control complexity
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A method for controlling a chromaticity of total light provided by a lighting system (12) includes detecting the total light by a sensor system (30), determining a component of the total light that is attributable to uncontrolled light, and selecting a calibration for a sensor based on the uncontrolled light, and using the calibration to adjust the output of the sensor system (30). The calibration tables (38) may be based on spectral responsivity of the sensors in the sensor system (30) and calibration functions rather than physical light sources. Relative intensities of controllable light sources (16) having different xy values are then adjusted to cause the total light provided by the lighting system (12) to approximate a target chromaticity. A daylighting system implementing this method includes controllable light sources (16) with different xy values. The intensities of the controllable light sources (16) are adjusted to augment sunlight to control the chromaticity of total light provided by the daylighting system.