Lighting Control System for Circadian Rhythm Synchronization
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Solution Overview
Problem
Current lighting systems in indoor spaces, while focusing on color rendering quality, fail to adequately address the effects of lighting on human circadian rhythms and overall well-being, particularly in work environments where circadian-effective lighting design is crucial for synchronizing human internal clocks with the 24-hour day.
Innovation Solution
A lighting control system comprising a light fixture with multiple light emitting devices and an information processing apparatus that adjusts the irradiation percentages of light emitted based on time of day, ensuring a significant difference in melanopic ratios to enhance circadian-effective lighting, thereby addressing the effects on human body rhythms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If lighting systems focus on color rendering quality, then color rendering is improved, but circadian rhythm effects on human body are worsened
Solution Approach 1:
The lighting system divides the light source into multiple independent light emitting devices with different correlated color temperatures. This segmentation allows independent control of each device's emission, enabling the system to simultaneously achieve good color rendering (using appropriate color temperature light) and support circadian rhythms (using high melanopic ratio light at specific times).
Solution Approach 2:
The system dynamically adjusts the irradiation percentages of different light emitting devices based on the time of day. During daytime hours, the system increases the proportion of light with higher melanopic ratios to support circadian rhythms, while maintaining color rendering quality. This dynamic adjustment resolves the contradiction by making the lighting characteristics time-dependent rather than fixed.
2Device complexity
If single light emitting device is used, then device complexity is reduced, but ability to control circadian characteristics is worsened
Solution Approach 1:
The lighting fixture incorporates multiple light emitting devices with different spectral characteristics. This segmentation provides the versatility needed to control circadian characteristics by selectively activating devices with different correlated color temperatures and melanopic ratios, while the modular design keeps the increase in complexity manageable.
Solution Approach 2:
The lighting system achieves multi-functionality by using multiple light emitting devices that can serve different purposes: some devices optimize for color rendering while others optimize for circadian rhythm support. The emission controller integrates these devices into a unified system that can adapt to different lighting needs throughout the day, making the system versatile without requiring entirely separate lighting systems.
3Object-affected harmful factors
If irradiation percentages are adjusted to maximize circadian characteristics, then circadian rhythm synchronization is improved, but color rendering consistency is worsened
Solution Approach 1:
By segmenting the light output into multiple controllable light emitting devices with different spectral properties, the system can adjust the mix to prioritize circadian characteristics during certain times while maintaining color rendering consistency during others. The emission controller manages this balance by coordinating the emission of individual devices.
Solution Approach 2:
The system changes the parameters of light emission by adjusting the irradiation percentages of different light emitting devices based on time of day. During morning and evening hours, the system increases the proportion of light with higher melanopic ratios to support circadian rhythms. The emission controller ensures that color rendering remains consistent by carefully managing the spectral composition through parameter adjustment.
Data Source
AI summary
A lighting fixture includes: one or more first light emitting devices configured to emit first light and second light for circadian rhythms; and a second light emitting device configured to emit third light having substantially effective emission wavelength in the 320 nm to 420 nm range. A correlated color temperature of the second light is higher than a correlated color temperature of the first light. A meranopic ratio of the second light is higher than a meranopic ratio of the first light.