LED Illumination Device Vent to Heat Sink
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Solution Overview
Problem
Existing LED lighting devices face challenges in achieving high light output in a compact package with low effective projected area (EPA) while ensuring efficient heat dissipation and precipitation passage.
Innovation Solution
The design incorporates a housing with a heat sink and shroud that includes a plurality of fins, where LED modules are secured to landing pads with open areas for air and precipitation pathways, and a shroud that serves as part of the heat sink, reducing EPA and enhancing heat dissipation through a carefully calibrated configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If LED modules are arranged to maximize light output, then illumination intensity is improved, but heat dissipation becomes insufficient
Solution Approach 1:
The housing is merged with the heat sink, forming an integrated structure where the housing body serves as both the enclosure and the thermal management component. This integration allows the housing to simultaneously protect internal components and dissipate heat from the LED modules through its thermally conductive material and fin structure.
Solution Approach 2:
The heat sink extends in multiple dimensions with fins protruding from the housing body, creating a three-dimensional thermal dissipation structure. This dimensional expansion increases the surface area for heat dissipation without significantly increasing the overall footprint of the fixture, allowing high light output while managing thermal load effectively.
2Area of stationary object
If housing is made compact to reduce EPA, then effective projected area is reduced, but heat dissipation efficiency deteriorates
Solution Approach 1:
The heat sink utilizes vertical and lateral dimensions with fins that extend from the housing body, creating a three-dimensional thermal dissipation structure. This dimensional expansion increases the surface area for heat dissipation without significantly increasing the overall footprint of the fixture, allowing high light output while managing thermal load effectively.
Solution Approach 2:
The heat sink is segmented into multiple fins that extend from the housing body, creating multiple heat dissipation pathways. This segmentation allows heat to be distributed across multiple surfaces and directions, improving thermal management efficiency while maintaining a compact overall structure with reduced effective projected area.
3Temperature
If fins are added to heat sink, then heat dissipation is improved, but precipitation passage is blocked
Solution Approach 1:
The fin structure is designed with varying local characteristics, including spacing, orientation, and height variations, that create pathways for precipitation to pass through while maintaining effective heat dissipation surfaces. Different regions of the fin structure serve different functions: some areas maximize thermal contact while other areas facilitate water drainage.
Solution Approach 2:
The fin configuration is designed to dynamically respond to environmental conditions, with the spacing and orientation of fins creating natural drainage pathways that adapt to precipitation patterns. The structure allows water to flow through designated channels while maintaining thermal contact for heat dissipation, balancing thermal management with weather resistance.
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 achieves a high lumen output of about 60,000 lumens/ft2 EPA with reduced effective projected area, efficient heat dissipation, and allows for precipitation passage, addressing the need for compact, efficient, and adaptable LED lighting solutions.
Implementation Method 1
A heat sink including a plurality of fins is disposed between the opening and the power supply
Implementation Method 2
The open areas and fins may be arranged so that precipitation can pass through a channel that extends from an open area, between the fins, to the second end of the body portion
Data Source
AI summary
A light fixture includes a housing comprising a body portion with an opening at a first end, a power supply at an opposing second end, and a heat sink comprising a plurality of fins between the opening and the power supply. A mating surface is positioned proximate to the opening. The mating surface includes a set of landing pad areas and a set of open areas. The fixture also includes a set of light emitting diode (LED) modules, each of which is positioned in the opening and secured to a landing pad area of the mating surface. The LED modules are arranged so that the plurality of open areas remain open to the atmosphere and provide an air path to and from the heat sink.