LED Fixture Control for Wide Color Temperature Range
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Solution Overview
Problem
Existing LED light fixtures face efficiency challenges when attempting to provide adjustable white light across a wide range of color temperatures and intensities, particularly at warmer color temperatures, which are historically less efficient due to the need for less efficient phosphor coatings and more LEDs to achieve illumination.
Innovation Solution
A system and control method that allows independent control of correlated color temperature (CCT) and light output intensity across a range, using a driver and programmed controller to adjust LED light output based on user inputs from single or dual handles, limiting warmer temperatures at full intensity and allowing combinations of CCT and intensity levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If LED fixtures use warmer color temperatures to meet user preferences for adjustable white light, then adaptability is improved, but energy efficiency deteriorates due to less efficient phosphor coatings requiring more LEDs
Solution Approach 1:
The LED fixture is divided into multiple LED groups with different color temperatures (e.g., first group at cooler temperature, second group at warmer temperature). By segmenting the light source into discrete groups with distinct CCT characteristics, the system can selectively activate only the groups needed to achieve the desired color temperature and intensity, avoiding the energy inefficiency of using all LEDs at full power for warm dimming scenarios.
Solution Approach 2:
The system dynamically adjusts which LED groups are active and at what intensity levels based on the desired color temperature and intensity output. The controller dynamically selects combinations of LED groups to maintain high efficiency across the full range of CCT and intensity settings, transitioning between different group configurations rather than relying on fixed phosphor coatings.
2Illumination intensity
If LED fixtures use more LEDs and brighter output to achieve given illumination at warmer colors, then illumination intensity is improved, but energy consumption increases
Solution Approach 1:
By segmenting LEDs into groups with different efficiency characteristics, the system can illuminate the space using only the most efficient LED groups for the current lighting conditions. Instead of turning on all LEDs to achieve sufficient illumination at warm temperatures, the controller activates only the necessary subset of groups, reducing energy waste while maintaining required illumination levels.
Solution Approach 2:
The system changes the operational parameters by selectively activating different LED groups based on the desired output. Rather than operating all LEDs at reduced efficiency, the controller adjusts which groups are active and at what drive levels, optimizing the balance between illumination intensity and energy consumption for each operating condition.
3Device complexity
If a single handle controls both intensity and CCT, then device complexity is reduced, but control precision deteriorates as both parameters compete for the same control input
Solution Approach 1:
The control system is segmented into separate handles for intensity and CCT control. This segmentation allows each handle to dedicate its full resolution and control range to a single parameter, preventing the loss of precision that would occur if both parameters had to share a single control input. Users can independently adjust intensity and color temperature without one adjustment affecting the other.
Solution Approach 2:
The dual-handle control system provides universal control capability, where the first handle universally controls intensity across all CCT settings and the second handle universally controls CCT across all intensity levels. This multi-functional separation allows precise control of both parameters simultaneously, with each handle optimized for its specific function while working together within the same lighting system.
Data Source
AI summary
A system allows a light fixture to have a wider range of color temperatures (CCT) while limiting the warmest temperature reached at full intensity. The CCT of the light output may be controlled independently of intensity across a certain range of CCT and dependent on intensity across another range. In an implementation, both intensity and CCT may be adjusted from a single handle, where the interface positions may be divided into multiple zones. In another implementation, intensity may be adjusted from a first handle, while CCT may be adjusted from a second handle. The CCT of the light output may be limited to cooler levels when the intensity is higher, and/or the intensity of the light may be limited to lower levels when the CCT is warmer.