Passive Cooling Lighting Fixture with Vented End Caps

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Solution Overview

Problem

LED lighting fixtures produce harsh light and are prone to overheating, which reduces their lifespan and can lead to premature failure, especially in indoor applications where heat sinking with fans is impractical due to size and power constraints.

Innovation Solution

A passive cooling lighting fixture with a diffusing lens and a heat sinking system using double-walled, vented end caps that circulate air to dissipate heat without moving parts or additional power consumption, creating a softer light source and extending LED lifespan.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If LED lights are used to provide energy-efficient illumination, then energy consumption is reduced and lifespan is extended, but the light produced is too bright and harsh for indoor use

Engineering Contradiction:

Improveenergy consumptionVSAvoidlight harshness

Core Design Contradiction:

Use of energy by moving objectVSIllumination intensity

Solution Approach 1:

A diffusing lens is introduced as an intermediary component between the LED light source and the indoor environment. The lens scatters and softens the harsh LED light while maintaining the energy efficiency benefits of the LED source, thereby resolving the contradiction between energy savings and light quality.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Adaptability or versatility

If LED lights operate in warmer environments, then they can be used in more locations, but the LEDs will overheat and fail due to temperature-dependent performance degradation

Engineering Contradiction:

Improveenvironmental adaptabilityVSAvoidLED operating temperature

Core Design Contradiction:

Adaptability or versatilityVSTemperature

Solution Approach 1:

The patent replaces active mechanical cooling systems (such as fans) with a passive heat sinking system that utilizes natural convection and conduction through the fixture structure. This allows the LED to operate in warmer environments without adding moving parts or power consumption, resolving the contradiction between environmental adaptability and temperature control.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Temperature

If a fan is added to cool the LED, then heat dissipation is improved, but the device size increases and power consumption increases

Engineering Contradiction:

Improveheat dissipationVSAvoidcooling system complexity

Core Design Contradiction:

TemperatureVSDevice complexity

Solution Approach 1:

The heat sinking system is designed to cool the LED automatically without external control or additional power input. The passive convection channels and thermal conduction paths self-regulate based on temperature differentials, eliminating the need for fans or active cooling components, thereby resolving the contradiction between heat dissipation and device complexity.

Inventive Principle:

Principle #25Self-service

4Ease of manufacture

If incandescent light bulbs are used, then they are inexpensive and easy to manufacture, but they consume excessive energy and become very hot

Engineering Contradiction:

Improvemanufacturing simplicityVSAvoidenergy consumption

Core Design Contradiction:

Ease of manufactureVSUse of energy by moving object

Solution Approach 1:

The patent transitions from incandescent technology to LED technology, fundamentally changing the light generation parameter from thermal radiation to electroluminescence. This parameter change dramatically reduces energy consumption while maintaining manufacturing simplicity through standardized LED module integration in the fixture design.

Inventive Principle:

Principle #35Parameter changes

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 solution provides a softer light output suitable for indoor use while effectively managing heat dissipation, enhancing LED longevity without noise or power requirements, thus overcoming the limitations of traditional LED lighting.

Implementation Method 1

This passive cooling lighting fixture provides a filtering lens that diffuses the harsh LED light source creating light that is appropriate for indoor use

Methodology Applied

Scientific EffectLight diffusion: Scattering

Implementation Method 2

The heat sinking system includes double walled, vented end caps that fit over the ends of lighting fixture as well as a double walled portion of the lighting fixture that draws heat away from the LED lights. Some of the vents in the end caps are oriented at the base of the end cap, nearest the base of the lighting fixture where the LED lights are situated. The rest of the vents in the end caps are oriented at the distal end of the end cap. Cool air from outside the lighting fixture is circulated through the inner chamber. This cools and moves the hot air away from the LED light components.

Methodology Applied

Scientific EffectConvection: Convection

Implementation Method 3

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Data Source

PatentUS8864332B2Passive cooling lighting fixture

Publication Date: 2014.10.21 LIGHT EMITTING DESIGN INC

AI summary

A passive cooling lighting fixture that includes a light diffusing lens. The fixture is self-contained and self-cooled in order to maximize the life span of the light source. The passive cooling system utilizes vented end caps that circulate cool air into the lighting fixture while venting hot air out of the lighting fixture. The light diffusing lens produces a light that is soft enough for use indoors.