Translucent End Cap for Luminaire Up-Lighting
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Solution Overview
Problem
Existing commercial lighting fixtures suffer from inefficient light transmission at the ends due to opaque metal housings, which restrict both end-lighting and up-lighting, and previous solutions do not effectively address this issue.
Innovation Solution
A translucent plastic end cap with a vertical face and horizontal perimeter wall is designed to emit light in a continuous band around the perimeter, providing both vertical and horizontal light transmission, including up-lighting, by being non-contiguous with the metal upper housing and matching the lower lens perimeter, while allowing for heat dissipation and improved mounting options.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If an opaque metal housing is used, then cost and weight are reduced, but light transmission is blocked
Solution Approach 1:
The end cap is divided into multiple functional zones: a vertical end face for direct light transmission, a horizontal perimeter wall for side light emission, and an upper portion extending above the housing for up-lighting. Each segment performs a specific lighting function to maximize overall light distribution efficiency.
Solution Approach 2:
The end cap extends in multiple spatial dimensions: vertically above the housing for up-lighting, horizontally for side lighting, and inwardly to enclose lamp ends. This multi-dimensional configuration transforms the traditional single-plane end cap into a three-dimensional light distribution structure.
2Illumination intensity
If a traditional end cap is used, then manufacturing is simple, but end-lighting and up-lighting efficiency are insufficient
Solution Approach 1:
The single end cap structure performs multiple lighting functions simultaneously: it provides direct end lighting through the vertical face, side lighting through the horizontal perimeter wall, and up-lighting through the upper portion extending above the housing. This multi-functional design eliminates the need for separate lighting components.
Solution Approach 2:
The end cap utilizes light that would otherwise be wasted or blocked by the housing structure. By positioning translucent portions at strategic locations, the cap captures and redirects light from the LED tube ends and housing interior, converting previously lost light into useful illumination without requiring additional light sources.
3Illumination intensity
If the end cap matches the housing cross-section, then mounting is simplified, but light distribution is restricted
Solution Approach 1:
The end cap is segmented into a lower mounting portion that interfaces with the housing and an upper lighting portion that extends above. The lower portion can be shaped to match the housing for secure mounting, while the upper portion is configured independently to optimize light distribution and up-lighting functionality.
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 significantly enhances end-lighting and up-lighting efficiency, providing a more even and aesthetically pleasing lighting effect without additional LEDs or reflectors, and accommodates irregularly shaped metal housings.
Implementation Method 1
The cap further comprises a translucent horizontal perimeter wall extending inwardly from and perpendicular to the vertical end face. Light is emitted in a vertical plane from all edges of the end cap, i.e. in a continuous band around the cap perimeter
Implementation Method 2
Some of the light emitted from the ends of the lamp tube is reflected off the bottom portion of the end cap and the inclined reflector against the side or face of the end cap and thus transmitted out the end of the fixture
Implementation Method 3
The end cap assembly includes an outer lens, an inner lens, and a reflector. The lenses correspond to the fixture housing cross-section, and are rounded and angled downwardly from the housing at different angles to reflect and diffuse light received from the lamps
Data Source
AI summary
A translucent end cap for an elongated luminaire having an upper metal housing and a lower translucent lens. The end cap has a vertical translucent face and a horizontal, inwardly extending perimeter wall. The cross-sectional shape of the end cap is different than that of the luminaire, and in particular an upper portion of the end cap and perimeter wall extends above and is non-contiguous with the outer or perimeter edge of the metal upper housing. The perimeter wall of the end cap transmits light from the interior of the luminaire in a vertical plane around the entirety of the luminaire, including above the metal housing for up-lighting. The non-contiguous end cap also provides an aesthetic cover for an upper metal housing with an irregular contour that includes a heat dissipating driver- or ballast-mounting channel with an air channel.