Additive LED Fixture Color Control Across Variable Beam Angles
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Solution Overview
Problem
Inherent variations in LEDs lead to color inconsistencies in additive light fixtures, making it challenging to achieve a consistent target color across different light sources.
Innovation Solution
A controller adjusts power to individual LED-optics clusters based on measured color and flux values to combine light beams into a desired color, using a lookup table to determine optimal power distribution for each cluster.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If multiple LEDs are used in additive light fixtures to achieve desired beam angle, then beam angle control is improved, but color consistency deteriorates due to inherent LED variations
Solution Approach 1:
The system performs preliminary characterization of each LED's color and flux properties before operation. Lookup tables are pre-computed based on measured LED parameters, enabling the controller to select and adjust individual LED outputs to achieve target color temperature and beam angle without manual calibration during installation.
Solution Approach 2:
The system dynamically adjusts the operating parameters (current, power) of individual LEDs based on their measured characteristics. By varying the drive current to each LED-optics cluster according to pre-computed lookup tables, the system compensates for manufacturing variations and achieves consistent color output across all LEDs in the fixture.
2Manufacturing precision
If individual LED color variations are compensated to achieve target color, then color consistency is improved, but system complexity increases due to need for measurement and control of each LED
Solution Approach 1:
The fixture is divided into multiple independent LED-optics clusters, each characterized and controlled individually. This segmentation allows the system to measure and adjust each cluster's color and flux properties separately, compensating for variations without requiring complex interactions between clusters.
Solution Approach 2:
The system creates simplified digital representations (lookup tables) of each LED's color-flux characteristics based on initial measurements. These digital models are stored and used by the controller to determine optimal power settings, replacing the need for complex real-time calculations and measurements during operation.
3Manufacturing precision
If power is adjusted to each LED-optics cluster based on measured values, then color accuracy is improved, but measurement and processing time increases
Solution Approach 1:
All necessary measurements of color and flux for each LED are performed during initial setup, and lookup tables are pre-computed and stored. This preliminary characterization eliminates the need for iterative measurements during operation, reducing setup time while maintaining color accuracy through the use of pre-determined power settings.
Solution Approach 2:
The system performs measurements and computations for all LED-optics clusters during initial setup, even though not all data may be immediately needed. This excessive initial action ensures that complete characterization data is available, allowing for rapid adjustments during operation without requiring additional measurement time.
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 solution ensures that the combined light output matches the target color accurately by accounting for variations in LED performance, providing consistent color control across the fixture.
Implementation Method 1
light emitting diodes (LEDs) of a first LED-optics cluster are configured to emit the first lights
Data Source
AI summary
A method of controlling a color of a light provided by a light fixture includes obtaining measured color values of first lights and measured color values of second lights. The method includes determining a resultant color of a first light beam at least based on the measured color values of the first lights and determining a resultant color of a second light beam at least based on the measured color values of the second lights. The method includes controlling first power provided to LEDs of a first LED-optics cluster and second power provided to LEDs of a second LED-optics cluster at least based on the resultant color of the first light beam and the resultant color of the second light beam such that a color of a combined light that is a combination the first light beam and the second light beam has a color matching target color, wherein the relative contributions of individual lights of the first lights to the first light beam are determined based on a value of a target beam angle of the combined light and wherein the relative contributions of individual lights of the second lights to the second light beam are determined based on the value of the target beam angle of the combined light.