LED Lighting Device Peripheral Reflector Geometry
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Solution Overview
Problem
Existing outdoor lighting devices, particularly street lighting, suffer from inefficiencies due to dispersed light beams and the screen effect of light sources, leading to significant loss of luminous energy, as they are not effectively directed towards the target.
Innovation Solution
The design incorporates LED light sources with their Full Width at Half Maximum (FWHM) luminous spectrum totally reflected by strategically shaped reflecting surfaces, ensuring that most light beams are directed towards the target, minimizing dispersion and increasing luminous efficacy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If traditional light sources (incandescent, halogen, fluorescent) are used, then the light beams are emitted in all directions providing omnidirectional illumination, but the light sources act as screens blocking most light beams causing significant energy loss
Solution Approach 1:
The invention extracts the light source from the center position and places it at the periphery of the reflector system. This peripheral positioning removes the light source from the path of the light beams it generates, eliminating the screen effect that caused energy loss while maintaining omnidirectional illumination capability through the reflector geometry
Solution Approach 2:
The invention introduces a reflector as an intermediary element between the light source and the target area. The reflector captures light beams emitted in all directions and redirects them toward the desired illumination zone, converting the omnidirectional emission into directed illumination while preventing the light source itself from blocking the beams
2Area of stationary object
If light sources are placed at a considerable distance from the target, then the illumination covers a larger area, but the light beams become dispersed reducing lighting efficiency
Solution Approach 1:
The invention employs a movable lighting device that can dynamically adjust its position and orientation relative to the target area. This dynamic positioning allows the system to optimize the balance between coverage area and beam concentration, maintaining high lighting efficiency while adapting to different illumination requirements and distances
3Loss of energy
If reflecting surfaces are added to redirect light beams towards the target, then the luminous efficacy is considerably improved, but the device complexity increases
Solution Approach 1:
The invention segments the reflector surface into multiple distinct zones, each with specific geometric characteristics optimized for different functions: some zones redirect light at specific angles, others concentrate beams, and some areas provide diffuse reflection. This segmentation allows complex optical functionality to be achieved through modular geometric design rather than a single complicated surface
Solution Approach 2:
The invention utilizes curved and shaped reflecting surfaces with specific geometric profiles designed to redirect light beams in predetermined patterns. The curved geometries naturally guide light rays through reflection to achieve concentration and directionality without requiring additional optical elements, simplifying the overall device structure while maintaining high luminous efficacy
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 significantly enhances luminous efficacy by maximizing the recovery of light beams that would otherwise be lost, reducing the screen effect of the light source, and allowing for tailored reflection and projection configurations for improved light distribution.
Implementation Method 1
one or more reflecting surfaces (5) designed to at least partially reflect the light beams (40). At least a first one (8) of the LED sources has the FWHM of its luminous spectrum totally reflected by at least one of the reflecting surfaces (5) and totally projected towards a target
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
An outdoor lighting device for lighting a target (O), particularly for use in street lighting, comprising a support structure (2) and a lighting unit (3, 103, 503) stably associated with the support structure (2) and having one or more light beam sources (4) of LED type, with preset FWHM values, and one or more reflecting surfaces (5, 105, 205, 305, 405, 505) designed to at least partially reflect light beams. At least a first one (8, 108, 508) of the LED sources (4) has the FWHM of its luminous spectrum totally reflected by one or more of the reflecting surfaces (5, 105, 205, 305, 405, 505) and totally projected towards the target (O) for increased lighting efficiency.