Phyllotactic LED Arrangement Reduces Glare in Outdoor Luminaires
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Solution Overview
Problem
Conventional outdoor luminaires with orthogonally arranged LEDs suffer from discomfort glare and pixilation due to the regular arrangement of light sources, which can be distracting and undesirable, especially in applications like street lighting where a well-defined beam shape is required.
Innovation Solution
The use of alternative LED arrangements such as 'organic' or 'random' patterns, specifically phyllotactic patterns based on the Fibonacci sequence, or a combination of phyllotactic and random patterns, to distribute LEDs in a non-orthogonal configuration, along with beam shaping optics to create a natural and uniform light distribution without straight lines, reducing glare discomfort while maintaining the required beam shape.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If orthogonally arranged LEDs are used in outdoor luminaires, then the beam shape can be well-defined, but discomfort glare and pixilation occur due to the regular arrangement of light sources
Solution Approach 1:
The patent applies asymmetry by replacing the conventional orthogonal (symmetrical) LED arrangement with an asymmetric random or phyllotactic pattern. This asymmetric distribution of light sources eliminates the regular geometric patterns that cause discomfort glare and pixilation effects, while the beam shaping optics maintain the required directional beam shape for outdoor lighting applications.
2Ease of manufacture
If regular orthogonal LED arrangements are used, then manufacturing is simplified, but the arrangement creates an attention-attracting effect that is undesirable in outdoor lighting
Solution Approach 1:
The patent inverts the conventional approach by deliberately choosing irregular, random, or phyllotactic LED arrangements instead of simple orthogonal patterns. This inversion of the design paradigm eliminates the attention-attracting regular patterns while the beam shaping optics ensure that the emitted light forms the required functional beam shape for outdoor lighting.
3Shape
If transparent covers are used to maintain well-defined beam shape, then direct visibility of LEDs and their optics occurs, but this results in discomfort glare
Solution Approach 1:
The patent applies local quality by differentiating the optical properties at different locations: the beam shaping optics maintain well-defined beam shape in the emission direction, while the asymmetric LED arrangement behind the transparent cover ensures that the individual light sources are not directly visible as regular patterns, thereby reducing discomfort glare while preserving beam definition.
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
This approach effectively minimizes glare discomfort associated with regular LED arrangements while providing a well-defined beam shape suitable for outdoor lighting applications, enhancing the aesthetic and functional performance of luminaires.
Implementation Method 1
a plurality of beam shaping optics, each beam shaping optics configured to receive lighting device light of one of the lighting devices and configured to beam shape the lighting device light into a beam of lighting device light
Data Source
AI summary
The invention provides an outdoor luminaire (100) comprising: —a plurality of lighting devices (10), each lighting device (10) configured to provide lighting device light (11) and each lighting device (10) comprising at least a light source (13); —a plurality of beam shaping optics (20), each beam shaping optics (20) configured to receive lighting device light (11) of one of the lighting devices (10) and configured to beam shape the lighting device light (11) into a beam (12) of lighting device light (11); wherein the outdoor luminaire (100) is configured to provide a beam (112) of luminaire light (101) comprising the beams (12) of lighting device light (11); and wherein the beam shaping optics (20) are configured in an arrangement (120) which is random, phyllotactic or a combination thereof.