LED Fountain Lighting Thermal Separation
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Solution Overview
Problem
High output LED light fixtures for outdoor use face challenges with heat buildup and moisture sensitivity, leading to potential component damage and sealing integrity issues in rigorous environments like ingrade, fountain, and pool lighting.
Innovation Solution
A sealed lighting system with a thermally conductive LED light engine head and control housing, featuring a thermally conductive potting material, temperature sensors, and a control system that adjusts power to prevent overheating, along with a fixture support that thermally separates the light engine head from the control housing and uses wicking barriers for enhanced sealing and heat management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the LED light engine is sealed in a rigid chamber for protection, then reliability is improved, but heat dissipation deteriorates
Solution Approach 1:
The housing is divided into a light-tight chamber for the LED engine and a separate control housing for electronics. This segmentation allows the LED chamber to be sealed for protection while the control housing can manage heat dissipation separately, resolving the contradiction between protection and heat management.
Solution Approach 2:
A thermally conductive potting material is introduced as an intermediary between the LED engine and the chamber wall. This material facilitates heat transfer from the LED engine to the chamber structure while maintaining the sealed environment, thus improving heat dissipation without compromising protection.
2Illumination intensity
If high output LED light engines are used, then illumination intensity is improved, but thermal management complexity increases
Solution Approach 1:
The mounting structure combines mechanical support, electrical connection, and thermal management functions into a single integrated assembly. The bar engages with the chamber and provides structural support while the potting material provides thermal conduction, reducing overall system complexity despite high light output requirements.
Solution Approach 2:
The chamber structure serves multiple functions: it provides mechanical support for the LED engine, acts as a heat sink through the potting material, maintains light-tight sealing, and protects from moisture. This multi-functionality reduces the need for separate thermal management components.
3Reliability
If the control housing is sealed to protect electronics, then reliability is improved, but heat dissipation from electronics deteriorates
Solution Approach 1:
The housing is segmented into separate light-tight and control portions, allowing each to be optimized independently. The control housing can be designed with features for heat dissipation while maintaining sealing for electronics protection.
4Strength
If rigid mounting is used to secure the LED light engine, then structural stability is improved, but thermal contact deteriorates
Solution Approach 1:
The mounting system uses a composite approach combining rigid mechanical engagement (bar and chamber) with a thermally conductive potting material. This composite structure maintains structural stability while improving thermal contact between the LED engine and the chamber.
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
The system effectively protects LED components from thermal damage and maintains consistent light output in harsh outdoor conditions, ensuring reliable operation in submerged or wet environments.
Implementation Method 1
thermally conductive potting material
Implementation Method 2
A first temperature sensor measures the temperature of the plate
Implementation Method 3
The control gear electronics are constructed and arranged to reduce power to the LED light engine with the temperature sensor reaching a predetermined threshold temperature profile
Implementation Method 4
receptacles allow for both high voltage and low voltage power and control to be potted, creating wicking barriers
Data Source
AI summary
A fountain lighting system including a light engine head containing an LED light engine and a control housing containing control gear electronics includes a fixture support providing thermal separation between the light engine head and the control housing. The fixture support includes a lid with a bar extending from the edge thereof. The lid closes the control housing while the bar mounts the light engine head. An anchoring mount is also on the bar. The lid includes receptacles for receiving power, control and light engine cables with wicking barriers separating the various components provided in the lid itself. Temperature sensors in the light engine head and in the control housing send data communication to the control gear electronics to limit power to avoid thermal loading. The control gear electronics modulates the power to prevent apparent cycling. A pool lighting system provides similar features in a niche. A gap open to the niche thermally separates the light engine head from the control housing.