Light Source Apparatus Adjusting Circadian Stimulus
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Solution Overview
Problem
Current light sources fail to provide appropriate circadian stimulus lighting for different times of day, as they do not effectively differentiate between night and daytime lighting needs, impacting human melatonin secretion and circadian rhythms.
Innovation Solution
A light source apparatus with a control unit that switches between first and second lights, maintaining the same color temperature but varying the circadian stimulus value (CS/P value) to meet specific environmental and temporal requirements, ensuring appropriate lighting for maintaining natural circadian rhythms without altering perceived color temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a light source uses high color temperature to increase circadian stimulus during the day, then alertness is enhanced, but melatonin suppression increases at night which harms circadian health
Solution Approach 1:
The lighting system dynamically adjusts the spectral composition (CS/P value) based on time of day and environmental conditions. During daytime, higher CS/P values are used to enhance alertness, while at nighttime, the system transitions to lower CS/P values to reduce melatonin suppression, allowing the same light source to adapt to different circadian requirements throughout the day
Solution Approach 2:
The patent changes the spectral parameters of the light source by adjusting the CS/P value independently from color temperature. This allows the system to modify the circadian stimulus content while maintaining consistent visual appearance, enabling high alertness during day and low melatonin suppression at night using the same physical light source
2Reliability
If a light source adjusts color temperature to provide appropriate lighting for different times, then circadian health is improved, but the perceived color changes may affect user comfort and acceptance
Solution Approach 1:
The system selectively adjusts only the CS/P spectral parameter while keeping color temperature constant. This allows the light source to provide appropriate circadian stimulus for different times of day without changing the visual color perception, thereby maintaining user comfort and acceptance while improving circadian health
Solution Approach 2:
The patent separates the control of circadian stimulus (CS/P value) from visual color perception (color temperature). This segmentation allows independent optimization of circadian health effects without compromising user comfort, as each parameter can be adjusted according to its specific requirements
3Device complexity
If a single light source is used for both day and night, then device simplicity is maintained, but it cannot provide differentiated lighting for different circadian needs
Solution Approach 1:
The patent makes a single light source universal by enabling it to provide different circadian stimulus levels for both daytime and nighttime use. Through dynamic adjustment of the CS/P value, one light source replaces what would traditionally require separate daytime and nighttime lighting systems, reducing overall system complexity while maintaining adaptability
Data Source
AI summary
A light source apparatus includes a light-emitting module and a control unit. The light-emitting module is for providing a light. The control unit switches the light emitted from the light-emitting module between a first light and a second light, wherein the circadian stimulus value (CS/P value) of the second light is less than CS/P value of the first light, and the color temperatures of the second light and the first light are substantially the same as each other.