LED Luminaire Split Housing for Heat Dissipation
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Solution Overview
Problem
There is a need for high-performance LED-based luminaires that effectively manage heat dissipation and provide improved light extraction for large-scale architectural lighting applications, such as spotlight illumination and facade washing, while maintaining efficiency and reliability.
Innovation Solution
The design incorporates multiple LED-based lighting units with chip-on-board assemblies, a split housing structure with air gaps for heat dissipation, and heat-dissipating fins, along with separate power and control circuitry housings to facilitate efficient heat management and air flow, and utilizes split reflector optics to collimate light into a narrow beam.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If high-flux LEDs are used to increase luminous efficacy and light output, then illumination intensity is improved, but heat dissipation becomes more difficult and operating temperature increases
Solution Approach 1:
The luminaire is divided into multiple separate housing sections (first housing and second housing) with air gaps between them. Each housing contains LED modules with reflective surfaces, and the segmentation allows heat from high-flux LEDs to be distributed and dissipated through multiple paths rather than concentrating in a single housing, thereby maintaining lower operating temperatures while achieving high luminous efficacy
Solution Approach 2:
The patent introduces vertical air gaps between stacked housing sections and incorporates heat dissipation fins that extend in the vertical dimension. This three-dimensional heat dissipation structure allows heat to escape through convection currents in the air gaps and through the fin surfaces, adding thermal management capacity in the vertical dimension rather than relying solely on horizontal heat spreading
2Illumination intensity
If LED density and flux are increased to improve light output, then illumination intensity is improved, but heat dissipation efficiency deteriorates
Solution Approach 1:
By segmenting the luminaire into multiple housings with air gaps, the patent creates multiple heat dissipation pathways that scale with LED density. Each housing section can be independently optimized for heat removal, allowing high LED flux to be managed through distributed thermal management rather than a single bottleneck, thereby maintaining heat dissipation efficiency even as light output increases
Solution Approach 2:
The patent utilizes natural convection currents in the air gaps between housing sections as a passive thermal management system. Warm air rises through the vertical air gaps, creating continuous airflow that carries heat away from LED modules without requiring active cooling components, thereby maintaining high heat dissipation efficiency while supporting increased LED flux
3Illumination intensity
If fixture size is increased to accommodate more LEDs, then light output is improved, but handling safety and installation ruggedness deteriorate
Solution Approach 1:
The luminaire is segmented into multiple separate housing sections that can be handled and installed individually or in smaller groups. This segmentation reduces the weight and size of each handling unit compared to a single large fixture, improving safety during installation while maintaining high total lumen output through the combined output of multiple sections
Solution Approach 2:
Multiple standardized housing sections are designed to be combined in various configurations to achieve different total light output levels. This modularity allows the system to scale from smaller to larger installations by adding more sections rather than handling increasingly large single fixtures, thereby maintaining handling safety while achieving high lumen output through combination of multiple units
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 configuration enhances light extraction, heat dissipation, and energy efficiency, enabling the LED-based luminaire to project light over long distances with high lumen output and extended operational life, suitable for large architectural structures like skyscrapers and retail establishments.
Implementation Method 1
A TIR collimator includes a reflective inner surface that is positioned to capture much of the light emitted by a light source subtended by the collimator. The reflective surface of conventional TIR collimators is typically conical, that is, derived from a parabolic, elliptical, orhyperbolic curve.
Implementation Method 2
The lighting units of the luminaire are configured so as to form a 'split housing' structure with air gaps between the lighting units to facilitate heat dissipation
Data Source
AI summary
Disclosed herein are exterior architectural fixtures employing LED-based light sources that are capable of projecting light over long distances and providing a wide variety of lighting effects with high lumen output. These lighting fixtures have improved heat dissipation properties and are particularly suitable for large-scale façade washing and for illuminating large architectural structures, such as skyscrapers, casinos, and retail establishments, integrating efficient and compact power supply and control components for driving high-intensity LEDs to achieve a vast variety of lighting effects on a large scale.