Multi-Channel Rhythm Spectrum Modulation for High-CRI Day-Night Lighting
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Solution Overview
Problem
Existing methods struggle to simultaneously achieve high Color Rendering Index (CRI) and appropriate rhythmic stimulation levels in indoor lighting, affecting visual and physiological effects, and fail to meet standards like the Shanghai Group Standard T/SIEATA Ranking Evaluation for Classroom Lighting Quality.
Innovation Solution
A method involving a combination of white, blue, green, and blue-green LEDs on a substrate, with specific luminous flux adjustments to create daytime and nighttime rhythmic spectra, ensuring high CRI and desired rhythmic stimulation levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the rhythmic stimulation effect is adjusted by controlling light intensity and color temperature, then the rhythmic stimulation level is improved, but the visual effect deteriorates due to inevitable changes in color temperature and color rendering index
Solution Approach 1:
The patent segments the light source into multiple independent LED channels (warm white LED, blue LED, green LED, blue-green LED) that can be individually controlled. This allows separate adjustment of rhythmic stimulation (through blue LED at 450-465nm) and visual quality (through warm white LED with CRI>80), resolving the contradiction between rhythmic effect and visual effect
Solution Approach 2:
The patent changes the spectral composition parameters by introducing specific wavelength LEDs (blue 450-465nm, green 540-560nm, blue-green 490-500nm) alongside warm white LED (2600-3300K). This parameter change enables independent control of melanopic luminous flux for rhythmic stimulation while maintaining high CRI for visual quality
2Reliability
If the EML value is increased to meet daytime standards (EML≥200), then the rhythmic stimulation effect is improved, but the visual effect deteriorates due to required high illuminance (≥500 Ix)
Solution Approach 1:
The patent changes the spectral power distribution parameters by adding blue LED (450-465nm) and blue-green LED (490-500nm) channels to enhance melanopic luminous flux efficiency. This allows achieving EML≥200 with more efficient spectral composition, reducing the energy required to reach the same rhythmic stimulation level
3Reliability
If the EML value is decreased to meet nighttime standards (EML≤130), then the rhythmic stimulation effect is improved for nighttime, but the visual effect deteriorates due to required illuminance (≥300 Ix)
Solution Approach 1:
The patent segments the lighting system into independent controllable channels, allowing the blue LED (rhythmic stimulation) to be reduced for nighttime (0.72-0.88% luminous flux) while maintaining warm white LED (61.8-69.3% luminous flux) for adequate visual illumination, thus achieving EML≤130 with sufficient visual quality
Solution Approach 2:
The patent implements dynamic adjustment of luminous flux ratios between different LED channels based on time of day. During nighttime, the system dynamically reduces blue LED contribution while maintaining warm white LED dominance, enabling transition from daytime rhythmic profile to nighttime rhythmic profile with appropriate visual quality
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method achieves strong rhythmic stimulation with high CRI during the day and weak stimulation at night, enhancing learning and working efficiency while reducing melatonin secretion, meeting lighting standards for classrooms and night environments.
Implementation Method 1
providing a white light-emitting diode (LED), a blue LED, a green LED and a blue-green LED on a substrate
Implementation Method 2
The ipRGCs are activated by internal photosensitive proteins called melanopsin
Data Source
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AI summary
The present disclosure provides a method for modulating a rhythmic spectrum, including: providing a white light-emitting diode (LED), a blue LED, a green LED and a blue-green LED; and adjusting a luminous flux of each LED, thereby obtaining a rhythmic spectrum with a preset luminous flux, where the luminous flux of the white LED, the luminous flux of the blue LED, the luminous flux of the green LED, and the luminous flux of the blue-green LED respectively account for 62.32-75.9%, 1.74-1.91%, 1.5-20.27% and 15.5-22.8% in the preset luminous flux; or the luminous flux of the white LED, the luminous flux of the blue LED, the luminous flux of the green LED, and the luminous flux of the blue-green LED respectively account for 61.8-69.3%, 0.72-0.88%, 28.6-37.31% and 0-1.8% in the preset luminous flux. The present disclosure can obtain the rhythmic spectrum with an appropriate rhythmic stimulation effect, and is suitable for daily use.