Sunlight-Mimicking LED Lighting With UV for Circadian Regulation
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Solution Overview
Problem
Modern indoor lighting devices do not replicate the spectral power distribution of sunlight, which is essential for regulating human biological rhythms and vitamin D production, as they lack ultraviolet components present in natural sunlight.
Innovation Solution
A light emitting device incorporating light emitting diode chips and wavelength converters to mimic the spectral power distribution of sunlight, including ultraviolet rays, thereby replicating the natural light spectrum and providing vitamin D production capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional indoor lighting devices use blue, green, and red light emitting diodes to produce white light, then white light can be implemented, but the spectral power distribution does not cover a wide wavelength range like sunlight and lacks ultraviolet components
Solution Approach 1:
The patent divides the light spectrum into multiple segments by using separate light emitting diodes for different wavelength ranges (ultraviolet, blue, green, red) rather than relying on a single white light source. This segmentation allows each component to contribute specifically to replicating the spectral power distribution of sunlight at different times of day.
Solution Approach 2:
The patent employs a composite lighting system that combines multiple types of light emitting diodes (ultraviolet, blue, green, red) to create a composite light output that mimics the complex spectral power distribution of sunlight. This composite approach enables the device to produce the full range of wavelengths necessary for biological rhythm regulation and vitamin D synthesis.
2Object-affected harmful factors
If indoor lighting devices lack ultraviolet components, then safety is improved by avoiding UV exposure, but vitamin D production capability is lost
Solution Approach 1:
The patent applies partial action by including only the specific ultraviolet wavelength range (290-320 nm) that is effective for vitamin D production in human skin, rather than including the full ultraviolet spectrum. This selective approach provides the necessary UV exposure for health benefits while minimizing harmful effects by excluding higher energy, more damaging UV wavelengths.
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 device effectively simulates the spectral power distribution of sunlight, helping to regulate human biological rhythms and enable vitamin D production indoors, addressing the limitations of conventional indoor lighting.
Implementation Method 1
a light emitting diode chip and a wavelength converter to emit white light, wherein the light emitting diode chip comprises an ultraviolet chip, a violet chip or a blue chip
Implementation Method 2
a light emitting diode chip and a wavelength converter to emit white light
Implementation Method 3
the light emitting diode chip comprises an ultraviolet chip, a violet chip or a blue chip
Data Source
AI summary
A light emitting device including at least one main light emitting unit including a light emitting diode chip and a wavelength converter, and configured to emit white light, in which the light emitting diode chip includes at least one of an ultraviolet chip, a violet chip, and a blue chip, and the light emitting device is configured to be adjustable to emit light corresponding to a spectral power distribution of morning sunlight, light corresponding to a spectral power distribution of afternoon sunlight, and light corresponding to a spectral power distribution of evening sunlight.