Illumination Device Varying Melanopic Ratio for HCL
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Solution Overview
Problem
Existing indoor illumination systems do not adequately consider Human-Centric Lighting (HCL) principles, which are essential for optimizing circadian rhythms and overall comfort in indoor spaces.
Innovation Solution
An illumination device comprising a light-emitting device and a control device, which emits light with a melanopic ratio (MR) that varies by 0.3 or more within a predetermined time, and adjusts the correlated color temperature (CCT) in a range of ±500 K, to provide lighting that aligns with HCL principles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional illumination systems are used, then basic illumination function is provided, but Human-Centric Lighting (HCL) principles are not adequately considered
Solution Approach 1:
The illumination device dynamically adjusts the melanopic ratio of emitted light within a predetermined time period by varying the emission characteristics of its light sources. This enables the system to adapt to HCL principles by changing the biological effectiveness of light while maintaining manageable operational complexity through automated control.
Solution Approach 2:
The system changes the melanopic ratio parameter of the emitted light by adjusting the correlated color temperature within ±500K ranges and varying the spectral composition. This allows the illumination device to provide different biological effects (melanopic ratios varying by 0.3 or more) while using standard illumination components, thus improving HCL adaptability without excessive complexity increase.
2Reliability
If the melanopic ratio is varied by 0.3 or more within a predetermined time, then circadian rhythm synchronization is enhanced, but control complexity increases
Solution Approach 1:
The control device implements periodic variation of the melanopic ratio within predetermined time intervals, aligning with natural circadian rhythm cycles. This periodic adjustment ensures reliable circadian synchronization while the automated timing control prevents excessive operational complexity by following predetermined schedules rather than requiring continuous manual adjustment.
Solution Approach 2:
The system incorporates control mechanisms that monitor and adjust the melanopic ratio to maintain it within target ranges (varying by 0.3 or more). This feedback control ensures reliable circadian rhythm support while the automated control logic manages system complexity by using predetermined control algorithms rather than requiring complex real-time optimization.
3Illumination intensity
If the correlated color temperature is adjusted within ±500K, then light quality is optimized, but manufacturing precision requirements increase
Solution Approach 1:
The illumination device combines multiple light sources with different spectral characteristics (e.g., LEDs with different correlated color temperatures) to achieve the desired melanopic ratio variation. By merging multiple standard components with known spectral properties, the system achieves precise color temperature control (±500K) and optimized light quality without requiring ultra-precise manufacturing of individual components.
Solution Approach 2:
The system uses composite illumination approaches, combining multiple phosphor materials or LED types with different emission spectra. This composite approach allows flexible adjustment of correlated color temperature within ±500K and optimization of light quality for HCL applications while using commercially available materials with standard manufacturing tolerances rather than requiring exotic high-precision materials.
Data Source
AI summary
An illumination device includes a light-emitting device and a control device. The light-emitting device is configured to emit at least light of a first color temperature having a correlated color temperature in a range from 3500 K to 8000 K, the light having a melanopic ratio of a prescribed value within a variation range of the melanopic ratio in which a gap between a maximum value and a minimum value of the melanopic ratio at the first color temperature is 0.30 or more. The control device is configured to control the light emitted from the light-emitting device, within a predetermined amount of time, by varying the melanopic ratio of the light by 0.3 or more, and adjusting the correlated color temperature of the light in a range from 0 K to ±500 K with respect to the first color temperature.