Circadian LED Lighting Control With Time-Based Color Temperature
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Solution Overview
Problem
Existing illumination devices struggle to dynamically adjust color temperature and brightness to emulate natural sunlight conditions throughout the day and night, particularly lacking the ability to manually override automatic changes based on time of day and task requirements without relying on sensor outputs.
Innovation Solution
An illumination device system that uses timers to send time-of-day signals to automatically adjust color temperature and brightness, with manual override options via remote controllers to tailor changes based on specific tasks and room requirements, allowing for dynamic and consistent sunlight emulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If automatic color temperature adjustment based on time of day is implemented, then sunlight emulation is improved, but manual control flexibility deteriorates
Solution Approach 1:
The system dynamically adjusts color temperature automatically based on time of day while allowing manual override when needed. The controller switches between automatic mode (emulating natural sunlight progression) and manual mode (responding to user input), providing adaptability without sacrificing operational flexibility.
Solution Approach 2:
The system incorporates feedback mechanisms where sensor data about actual sunlight conditions feeds into the automatic adjustment algorithm, while simultaneously monitoring for manual override signals. This dual feedback path enables the system to respond to both environmental conditions and user needs.
2Measurement precision
If sensor-based automatic adjustment is used, then lighting accuracy is improved, but system complexity increases
Solution Approach 1:
The illumination device uses its own integrated sensors to automatically detect and respond to sunlight conditions without requiring external control systems. The device serves itself by autonomously adjusting color temperature based on real-time environmental data, reducing overall system complexity while maintaining accuracy.
Solution Approach 2:
The sensor system serves multiple functions: detecting sunlight conditions for automatic adjustment, providing data for scheduling features, and enabling manual override decisions. This multi-functionality reduces the need for separate dedicated systems, thereby reducing overall complexity.
3Adaptability or versatility
If dynamic color temperature changes are implemented, then task-specific lighting is improved, but energy consumption increases
Solution Approach 1:
The system implements periodic color temperature adjustments synchronized with natural daylight cycles rather than continuous changes. This periodic operation reduces the frequency of LED driver circuit adjustments and associated energy consumption while maintaining task-specific lighting quality during active periods.
Solution Approach 2:
The system changes the color temperature parameter dynamically based on task requirements and time of day, allowing optimization of energy consumption for specific tasks. By adjusting parameters rather than operating at fixed settings, the system achieves task-specific lighting with reduced overall energy consumption.
Data Source
AI summary
An illumination device, system, and method are provided herein for emulating sunlight along a daytime or nighttime locus. Color temperature is determined using a first color temperature curve that includes data representative of a first color temperature as a function of a time of day. In response to a request to a change in brightness of one or more LED chains, a target color temperature output as a function of the current time of day is determined using a second color temperature curve based on the requested change in brightness. The second color temperature curve includes the target color temperature corresponding to the determined current time of day. The target color temperature output includes a lesser change in color temperature at solar noon than the change in color temperature at sunrise and sunset.