LED Lamp Tuning Melatonin Suppression via Segmented Blue Spectrum
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Solution Overview
Problem
Conventional lighting sources, particularly white LED light sources, contribute to sleep disorders and circadian rhythm disruptions due to their blue light components, which suppress melatonin secretion, and filtering out blue light compromises color rendering properties.
Innovation Solution
A tunable LED lamp with a specific configuration of LEDs and color conversion materials that emit light with minimal melatonin suppression, maintaining high color rendering index (CRI) and adjustable blue light levels for different applications, including pre-sleep, phase-shift, and general lighting configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If blue light component (420 nm-480 nm) is filtered out to minimize melatonin suppression, then melatonin suppression is reduced, but color rendering properties deteriorate and photopic response is negatively affected
Solution Approach 1:
The patent segments the blue light spectrum into two distinct components: a first blue LED emitting at 450 nm (which does not significantly suppress melatonin) and a second blue LED emitting at 475 nm (which provides necessary photopic response and color rendering). This segmentation allows each wavelength to fulfill its specific function without the harmful effects of the full blue spectrum
Solution Approach 2:
The patent applies local quality by assigning different functional roles to different wavelengths within the blue spectrum. The 450 nm component is optimized for minimal melatonin suppression while the 475 nm component is optimized for photopic response and color rendering. This localized optimization of spectral components resolves the contradiction between reducing melatonin suppression and maintaining color rendering quality
2Use of energy by moving object
If conventional white LED light sources are used to provide efficient illumination, then energy efficiency is improved, but melatonin suppression increases due to blue light component
Solution Approach 1:
The patent changes the spectral parameters of the light source by using two specific blue LED wavelengths (450 nm and 475 nm) instead of the broad spectrum of conventional white LEDs. This parameter change maintains the energy efficiency of LED technology while selectively adjusting the spectral composition to minimize melatonin suppression by excluding the most suppressive wavelengths (420-480 nm peak)
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 LED lamp effectively minimizes melatonin suppression while maintaining high visual quality and color accuracy, allowing for optimal lighting conditions that support sleep and circadian rhythm adjustments without compromising color rendering.
Implementation Method 1
a color conversion material configured to perform a Stokes shift on light having a wavelength within the range from 440 nm to 460 nm
Data Source
AI summary
An LED lamp comprising a housing, a drive circuit configured to electrically couple to a power source, and an LED package that is electrically coupled to and driven by the drive circuit. The LED package comprises a first LED configured to emit light having a peak intensity of about 450 nm, a second LED configured to emit light having a peak intensity within the range from 475 nm to 495 nm, and a color conversion material configured to perform a Stokes shift on light having a wavelength within the range from 440 nm to 460 nm.