Adjustable LED Light Arrangement for Natural Dimming
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Solution Overview
Problem
Conventional LED light sources exhibit unnatural dimming behavior compared to incandescent and halogen lamps, lacking a natural appearance and effective color rendition, especially in specialized illumination and ambience lighting applications.
Innovation Solution
A light emitting arrangement featuring at least one first light emitting element with an emission peak in the blue wavelength range and a second light emitting element with an emission peak in the deep blue range, both independently controllable to adjust their luminous intensities, allowing for crisp white light production with a natural appearance and adjustable color temperature, thereby enhancing dimming behavior and contrast perception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional LED light sources use a blue light emitting element and yellow wavelength converting material to produce white light, then light conversion efficiency is improved, but color rendering accuracy and natural appearance deteriorate
Solution Approach 1:
The invention segments the blue light spectrum into two distinct wavelength ranges: a first blue light emitting element (440-460 nm) and a second deep blue light emitting element (380-440 nm). This segmentation allows independent control of each wavelength range to achieve both efficient light conversion and accurate color rendering, particularly for objects with fluorescent whitening agents that require deep blue excitation.
2Illumination intensity
If conventional LED light sources dim the light output, then illumination intensity is reduced, but natural appearance and color rendering deteriorate
Solution Approach 1:
The invention implements dynamic control by independently adjusting the luminous intensity of the first and second blue light emitting elements based on dimming requirements. The controller modifies the intensity ratio between the two elements to maintain natural appearance across different illumination levels, preventing the unnatural color shifts that occur in conventional LED dimming.
3Manufacturing precision
If conventional LED light sources use multiple light emitting elements with different wavelengths, then color rendering is improved, but device complexity increases
Solution Approach 1:
The invention merges the functionality of multiple wavelength components into a unified light emitting arrangement where the first blue light emitting element (440-460 nm) and second deep blue light emitting element (380-440 nm) work together with a yellow wavelength converting material. This combining approach achieves superior color rendering for white light while maintaining a relatively simple overall structure compared to using multiple separate light sources.
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 natural-looking dimming effect with minimal color point changes, improving the perception of white light and contrast, especially when illuminating objects with fluorescent whitening agents, while maintaining high color rendering index.
Implementation Method 1
at least one first light emitting element adapted to emit light of a first luminous intensity I1 and having an emission peak ("first emission peak") in a first wavelength range of from 440 to 460 nm
Implementation Method 2
at least one second light emitting element adapted to emit light of a second luminous intensity I2 and having an emission peak ("second emission peak") in a second wavelength range of from 380 to 440 nm
Data Source
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AI summary
A light emitting arrangement is adapted to produce white output light of a total luminous intensity Itot and having an emission peak in the wavelength range of from 400 to 440 nm, comprising: a first light emitting element adapted to emit light of a first luminous intensity I1 and having an emission peak in a first wavelength range of from 440 to 460 nm; and a second light emitting element adapted to emit light of a second luminous intensity I2 and having an emission peak in a second wavelength range of from 380to 440 nm, wherein the first light emitting element and the second light emitting element are independently controllable such that I2 can be adjusted independently of I1. The possibility of controlling the contribution of deep blue light allows a natural appearance of a crisp white light source at all emission intensities, and may also be used to enhance perception of contrast.