In-Grade Lighting Fixture Thermal Management and Modular Access
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Solution Overview
Problem
In-grade lighting systems face challenges such as limited lamp type availability due to heat generation, maintenance accessibility, and sealing integrity issues, particularly in indoor applications where thermal cycling, moisture, and vandalism are concerns, and outdoor applications where durability and security are critical.
Innovation Solution
A sealed in-grade lighting fixture design with a unique thermal flow system that includes an LED power control and heat sink arrangement, allowing for efficient heat dissipation through a radiator and heat sink, and a modular construction for easy maintenance, featuring a junction box accessible through a lens opening without requiring housing removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the lamp housing depth is reduced to fit limited space between floor and ceiling structures, then the fixture can be installed in multi-story structures with limited clearance, but the variety of lamp types available is limited and heat dissipation becomes more difficult
Solution Approach 1:
The fixture is divided into separate modular components including the housing, lamp socket assembly, and junction box. This segmentation allows different lamp types to be used by simply changing the lamp module while keeping the housing the same, thus maintaining versatility without increasing overall depth.
Solution Approach 2:
The junction box is positioned laterally adjacent to the lamp cavity rather than above or below it, utilizing horizontal space within the housing. This dimensional rearrangement allows adequate space for both heat dissipation and wiring operations without increasing the fixture's vertical depth.
2Length of stationary object
If the lamp housing depth is reduced, then the fixture fits in limited space, but access for relamping and maintenance becomes more difficult
Solution Approach 1:
The lamp socket assembly is made as a separate removable module that can be easily extracted from the housing through the lens opening. This modular design enables maintenance personnel to access and replace lamps without disassembling the entire fixture or requiring excessive depth for tool manipulation.
Solution Approach 2:
The lens opening serves multiple functions: it allows light to pass through during operation and also serves as the access point for lamp removal and installation. This multi-functionality eliminates the need for separate maintenance access openings, maintaining a compact depth while ensuring ease of repair.
3Reliability
If the lamp housing is sealed to protect against moisture and corrosion, then the fixture survives outdoor and humid environments, but heat dissipation and convection are adversely impacted
Solution Approach 1:
The lamp socket assembly is extracted as a separate removable component that can be taken out through the lens opening. This extraction allows the sealing system to remain intact for environmental protection while providing access for maintenance without compromising the sealed housing structure.
Solution Approach 2:
Heat dissipation is achieved by positioning the lamp socket and junction box laterally adjacent to each other, utilizing horizontal space for thermal management. This dimensional arrangement allows heat to dissipate through the housing sides rather than requiring vertical convection paths, maintaining both sealing integrity and effective cooling.
4Volume of stationary object
If the junction box is made small to fit limited depth, then the fixture maintains compact dimensions, but wiring manipulation and sealing become difficult
Solution Approach 1:
The junction box is positioned laterally adjacent to the lamp cavity rather than stacked vertically above or below it. This dimensional rearrangement provides adequate horizontal space for wiring manipulation and solid wire installation while keeping the overall fixture depth compact. The increased lateral volume accommodates ease of wiring without increasing depth.
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
Enhances the longevity and reliability of in-grade lighting systems by providing versatile lamp profiles, improved cooling, and easy maintenance while maintaining sealing integrity and reducing heat-related issues, thus addressing the limitations of existing designs.
Implementation Method 1
A radiator is in the lamp cavity directly below the LED board array. The radiator is constructed and arranged to radiate to directly beneath the second closed portion of the top wall.
Implementation Method 2
The lighting system includes an LED power control and heat sink arrangement, allowing for efficient heat dissipation through a radiator and heat sink
Data Source
AI summary
A lighting system has a sealable housing with a lamp cavity, a junction box and a partition wall there between with the junction box being laterally from beneath a lens opening. The system further includes a closure to close an access port in the partition wall which includes a conical wall with a circular plate truncating the wall. The plate extends across the bottom of the housing and a vertically extending sealing flange receives the closure. A ballast assembly is also located from beneath the lens opening. A formed seal is positioned about a lens which extends inwardly to capture optic components beneath the lens. A locking ring is restrained from compressing against the mounting flange of the lens. A lighting system employing an LED board array and LED power control includes a heat sink beneath the board array extending downwardly to a radiator for transfer of heat from the array downwardly to the lamp cavity for dissipation.