Dynamic Lighting Control for Biological Rhythm and Energy Savings
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Solution Overview
Problem
Existing lighting systems fail to balance light environments suitable for biological rhythms with energy-saving considerations, particularly in workplaces where working hours are not accounted for in lighting control.
Innovation Solution
A lighting system with a lighting control device that adjusts correlated color temperature and illuminance based on schedule information, using multiple light source elements with different color temperatures, and includes human detectors and luminance sensors to optimize light output during various time slots, ensuring energy efficiency and comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If lighting control is performed based on fixed time slots for high illuminance throughout working hours, then biological rhythm is supported, but energy consumption increases
Solution Approach 1:
The lighting control device dynamically adjusts illuminance levels based on real-time detection of person presence and activity state rather than using fixed time-based schedules. The system transitions from static time-slot control to dynamic adaptive control, modifying lighting output according to actual workplace conditions to reduce energy consumption while maintaining biological rhythm support when needed.
Solution Approach 2:
The system incorporates feedback from human detectors and luminance sensors to continuously monitor workplace conditions and adjust lighting output accordingly. This closed-loop control enables the system to respond to actual presence and activity levels, eliminating the need for continuous high illuminance during unoccupied periods or low-activity states, thereby reducing energy consumption while maintaining biological rhythm support during active working hours.
2Use of energy by moving object
If lighting control is reduced for energy-saving during working hours, then energy consumption decreases, but biological rhythm support is compromised
Solution Approach 1:
The system implements dynamic lighting control that adapts illuminance levels based on detected activity states. During active working hours when biological rhythm support is critical, the system maintains appropriate illuminance levels. During periods of low activity or unoccupied time, the system reduces illuminance to save energy. This dynamic adaptation resolves the contradiction by providing biological rhythm support only when actually needed during working hours.
Solution Approach 2:
The lighting control device changes operational parameters (illuminance level, color temperature) based on detected conditions. The system maintains higher illuminance and appropriate color temperatures during active working hours to support biological rhythms, while transitioning to lower illuminance levels during unoccupied periods or low-activity states to reduce energy consumption. This parameter adaptation enables the system to balance biological rhythm support with energy-saving objectives.
3Reliability
If high illuminance is maintained throughout the day, then biological rhythm is supported, but energy waste occurs during unoccupied periods
Solution Approach 1:
The system uses feedback from human detectors to monitor occupancy status and adjusts lighting output accordingly. When no persons are detected in the workplace during working hours, the system automatically reduces illuminance levels to minimize energy waste. When persons are present and active, the system restores appropriate illuminance levels to support biological rhythms. This feedback-based adaptive control eliminates energy waste during unoccupied periods while maintaining biological rhythm support during occupied working hours.
Solution Approach 2:
The lighting system autonomously monitors its own operational context through integrated sensors and automatically adjusts illuminance levels without external intervention. The system serves itself by detecting occupancy and activity states, then independently making lighting adjustments to prevent energy waste during unoccupied periods while maintaining biological rhythm support during active working hours, eliminating the need for manual control or external scheduling systems.
Data Source
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AI summary
Alighting system includes a lighting load and a lighting control device. The lighting control device is configured to adjust a light output of the lighting load to a first light output corresponding to a first correlated color temperature and a first illuminance in a first time slot, and to decrease the light output of the lighting load up to a second light output corresponding to a second correlated color temperature and a second illuminance with the passage of time in a second time slot after the first time slot.