White Light Module Spectral Tuning for Circadian Office Lighting
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Solution Overview
Problem
Current LED lighting products do not effectively enhance human concentration through circadian stimulus while maintaining energy efficiency and color rendering, primarily focusing on color temperature and illumination without considering the physiological impact on humans.
Innovation Solution
A light source module comprising a blue LED chip and additional luminous bodies that convert emitted light into specific color ranges, creating a cold white light with a correlated color temperature of 5700K, high color rendering index, and optimized spectral energy distribution to improve concentration and work conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If LED lighting products focus on color temperature and illumination indicators, then energy saving and illumination performance are improved, but the ability to enhance human concentration through circadian stimulus is insufficient
Solution Approach 1:
The patent applies local quality by creating specific spectral peaks at different wavelength regions (blue 430-470nm, cyan 470-500nm, green 500-560nm, yellow-green 560-580nm, red 600-680nm) with different intensities. Each wavelength region targets specific photoreceptors in the human eye to stimulate circadian rhythm while maintaining energy efficiency. The non-uniform spectral distribution with optimized peak intensities enables simultaneous achievement of energy saving and circadian stimulus enhancement.
2Ease of manufacture
If LED lighting products use conventional spectral distribution, then manufacturing simplicity is maintained, but color rendering index and luminous efficiency cannot be simultaneously optimized
Solution Approach 1:
The patent applies parameter changes by precisely controlling the peak wavelengths and relative intensities of multiple spectral components. The blue peak (430-470nm) provides high energy conversion, the cyan peak (470-500nm) fills the spectral gap, the green peak (500-560nm) enhances color rendering, the yellow-green peak (560-580nm) improves luminous efficiency, and the red peak (600-680nm) completes the spectral coverage. This multi-parameter optimization enables simultaneous improvement of color rendering index and luminous efficiency while maintaining manufacturability through standard LED chip and phosphor materials.
3Loss of energy
If LED lighting products optimize for high luminous efficiency, then energy conversion is improved, but the spectral distribution fails to provide high CS values for enhancing human concentration
Solution Approach 1:
The patent converts the traditionally harmful excessive blue light (430-470nm) into a beneficial component by optimizing its peak intensity ratio to 30-60% relative to the green peak. Instead of simply reducing blue light content, the patent strategically distributes energy across multiple peaks including cyan (470-500nm) and green (500-560nm) regions, creating a spectral composition that stimulates circadian rhythm through multiple photoreceptor pathways while maintaining high overall luminous efficiency. This transforms the potential harm of blue light into a beneficial circadian stimulus.
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 solution provides a cold white LED light source with high luminous efficiency and high CS values, enhancing human concentration and suitable for office lighting by controlling the luminous energy distribution across different wavelength ranges.
Implementation Method 1
a first additional luminous body which is arranged to receive part of the light emitted by the first light-emitting element and convert it into second color light with a peak wavelength of 485 ~ 515nm
Implementation Method 2
a second additional luminous body which is arranged to receive part of the light emitted by the first light-emitting element and convert it into third color light with a peak wavelength of 520 ~ 580nm
Implementation Method 3
a third additional luminous body which is arranged to receive part of the light emitted by the first light-emitting element and convert it into fourth color light with a peak wavelength of 615 ~ 655nm
Data Source
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AI summary
A light source module and a lighting device using the light source module. The light source module includes a first light-emitting element and a packaging part covering the first light-emitting element. The packaging part includes a first additional luminous body, a second additional luminous body, and a third additional luminous body, the light emitted by each luminous body is mixed into day white light, which is used as the emitted light of the light source module. The light source module provided by the present invention provides a cold white LED (5700K) light source with high luminous efficiency, high CS values and high color rendering by controlling the ratio of luminous energy of different wavelength ranges in the total luminous energy. This kind of spectrum with high CS value, under the same illuminance, is especially suitable for people to concentrate on study and work.