Linear Lighting Optics for High-CRI Uniform Direct Viewing
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Solution Overview
Problem
Conventional linear lighting systems face issues with low color rendering index (CRI) values due to the use of white phosphor-converted LEDs, which require additional red LEDs to balance blue light, increasing cost, complexity, and power inefficiency, and are unsuitable for direct viewing due to discernable LEDs.
Innovation Solution
Employing white phosphor-converted LEDs combined with photo-luminescent materials to enhance CRI, and using reflective surfaces and lenses to distribute light uniformly, allowing for direct viewing applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If white phosphor-converted LEDs are used to provide broad spectrum light, then lighting coverage is improved, but color rendering index deteriorates due to excessive blue component
Solution Approach 1:
A photo-luminescent material layer is introduced as an intermediary between the white phosphor-converted LED and the emission aperture. This layer absorbs excess blue light and re-emits it at different wavelengths, thereby reducing the blue component and improving color rendering while maintaining broad spectrum coverage
Solution Approach 2:
The spectral parameters of the emitted light are modified by the photo-luminescent material layer, which changes the wavelength distribution by converting blue light to other wavelengths, thus adjusting the color rendering properties without changing the LED itself
2Manufacturing precision
If additional red LEDs are added to balance blue light component, then color rendering index is improved, but device complexity and cost increase
Solution Approach 1:
The function of adding red LEDs to balance the blue component is extracted and replaced by a photo-luminescent material layer that passively converts excess blue light to other wavelengths, eliminating the need for additional red LED components and reducing system complexity
Solution Approach 2:
The mechanical/electrical system of adding redundant LED components is replaced by an optical solution using photo-luminescent materials, which achieves the same color balancing function through optical conversion rather than additional light sources
3Manufacturing precision
If additional red LEDs are added to balance blue light component, then color rendering index is improved, but power efficiency deteriorates
Solution Approach 1:
The photo-luminescent material layer acts as an intermediary that converts excess blue light energy to other wavelengths rather than requiring additional red LEDs to consume extra power, thereby improving color rendering while maintaining power efficiency
Solution Approach 2:
The excess blue light component, which initially degrades color rendering, is converted into a beneficial resource by the photo-luminescent material that transforms it into useful wavelengths, turning a harmful spectral imbalance into a solution that improves color rendering without additional power consumption
4Adaptability or versatility
If LEDs are positioned for direct viewing, then application versatility is improved, but light uniformity deteriorates due to discernable individual LEDs
Solution Approach 1:
A planar light distributing element is introduced to create a new dimensional layer that diffuses and redistributes light from the discrete LEDs across a two-dimensional plane, transforming point-source emissions into a uniform area light source suitable for direct viewing applications
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
Achieves high CRI white light with power efficiencies exceeding industry standards and provides a uniform line of light suitable for direct viewing by reducing the blue component and enhancing red components, eliminating the need for additional red LEDs.
Implementation Method 1
Employing white phosphor-converted LEDs combined with photo-luminescent materials to enhance CRI, and using reflective surfaces and lenses to distribute light uniformly
Implementation Method 2
using reflective surfaces and lenses to distribute light uniformly
Implementation Method 3
using reflective surfaces and lenses to distribute light uniformly
Data Source
AI summary
Linear lighting system including tray extended along elongation directions and having base forming bottom interior surface of tray; first sidewall extending upward from base towards emission aperture of linear lighting system and second sidewall spaced apart across base from first sidewall and extending upward from base towards emission aperture. System further includes circuit board located on first sidewall in tray, plurality of LEDs located on circuit board and mutually spaced apart on first sidewall along elongation directions of tray and positioned for light emissions in directions facing toward second sidewall; and protuberance on base and interposed between LEDs and second sidewall, protuberance positioned for diverting light emissions from plurality of LEDs toward emission aperture. System having tray with first sidewall including angled reflective face and second sidewall including further angled reflective face, the faces positioned for reflecting light emissions toward the emission aperture.