Modular Angled LED Light Engine Fresnel Loss Reduction
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Solution Overview
Problem
Current street light fixtures suffer from significant light loss due to Fresnel reflection losses when light is bent at high angles, which is necessary for achieving uniformity and higher pole spacing, leading to inefficiencies in lumens per Watt.
Innovation Solution
The modular angled light engine design combines mechanical solutions with optical properties by angling the street light fixture to minimize Fresnel reflection losses, using a modular structure with heat sinks and interlocking features to maximize light efficiency, allowing for flexible and efficient installation and maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light is bent at high angles to achieve uniformity and higher pole spacing, then illumination uniformity is improved, but Fresnel reflection losses increase
Solution Approach 1:
The patent applies curvature by replacing flat lenses with curved/aspheric lenses in the light fixture. This curved lens design reduces Fresnel reflection losses when light transmits at high angles, while still achieving the necessary light bending for uniform illumination and higher pole spacing. The curvature of the lens allows for more efficient light transmission at the required angles.
Solution Approach 2:
The patent changes the optical parameters of the lens system by using aspheric or curved lens surfaces instead of flat surfaces. This parameter change modifies the refraction characteristics to reduce Fresnel reflections at high angles of incidence, thereby maintaining illumination uniformity while reducing energy loss.
2Ease of manufacture
If current street light fixture designs are used, then installation is simple, but lumens per Watt efficiency is poor
Solution Approach 1:
The patent segments the light fixture into modular components including separate housings, lenses, and mounting units. This modular segmentation maintains installation simplicity while improving lumens per Watt efficiency through optimized optical components and reduced Fresnel losses in each module.
Solution Approach 2:
By incorporating curved lenses into the modular fixture design, the patent maintains ease of installation while significantly improving energy efficiency through reduced Fresnel reflection losses, thereby increasing lumens per Watt performance.
3Ease of manufacture
If flat lenses are used in street light fixtures, then manufacturing is simple, but light transmission at high angles is lost
Solution Approach 1:
The patent transitions from flat lenses to curved or aspheric lenses that better transmit light at high angles. While manufacturing complexity increases slightly, the reduction in Fresnel reflection losses and improvement in light transmission efficiency justify the additional manufacturing effort.
Solution Approach 2:
The patent changes the lens shape parameter from flat to curved/aspheric, which modifies the optical transmission characteristics to reduce losses at high angles while maintaining reasonable manufacturing feasibility through established optical manufacturing techniques.
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 reduces light loss by optimizing the angle of light bending, enhancing lumens per Watt efficiency and allowing for easy maintenance by enabling the replacement of individual modules, thus reducing overall maintenance costs.
Implementation Method 1
a heat sink coupled to a first side of the at least one housing
Implementation Method 2
heat sink coupled to a first side of the at least one housing
Implementation Method 3
at least one light emitting diode (LED) coupled to an interior volume of the at least one housing
Implementation Method 4
a lens covering the at least one LED and coupled to a second side of the at least one housing
Implementation Method 5
The light fixture suffers with increased Fresnel reflection losses when light transmits through the flat lens at high angles
Data Source
AI summary
The present disclosure relates generally to a modular angled light engine. In one embodiment, the modular angled light engine includes a center portion comprising an interlocking feature to connect to a second modular angled light engine and at least one housing coupled to the center portion. The at least one housing includes a heat sink coupled to a first side of the at least one housing, at least one light emitting diode (LED) coupled to an interior volume of the at least one housing and a lens covering the at least one LED and coupled to a second side of the at least one housing.