Troffer Light Fixture Lens Assembly Uniformity
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Solution Overview
Problem
Troffer light fixtures using traditional lighting sources often suffer from uneven light distribution and glare, which can lead to discomfort and inefficiency, especially with the transition to solid-state lighting sources like LEDs, where achieving uniform luminance and reducing hotspots is challenging.
Innovation Solution
The design incorporates a specific lens assembly with an inner lens that diverges light from the center zone into lateral zones, using a negative lens configuration and symmetrical features to distribute light evenly, combined with a reflector that provides both specular and diffuse reflection sections for improved uniformity and reduced glare.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If traditional lighting sources are used in troffer light fixtures, then light distribution is achieved, but uneven light distribution and glare occur
Solution Approach 1:
The lighting system is segmented into multiple LED modules arranged in a specific pattern, with each module contributing to different zones of light distribution. This segmentation allows independent control and optimization of light output from different sections to achieve uniform overall distribution while eliminating glare.
Solution Approach 2:
Different regions of the light fixture are designed with different optical properties. The fixture incorporates zones with varying LED densities, lens types, and reflector configurations to optimize light distribution locally. This allows bright areas to be softened and dark areas to be illuminated more evenly, eliminating glare while maintaining overall illumination.
2Use of energy by moving object
If solid state lighting sources like LEDs are used, then energy efficiency and operational lifetime are improved, but achieving uniform luminance and reducing hotspots becomes challenging
Solution Approach 1:
The LED array is divided into multiple independent modules or zones, each with its own optical control elements. This allows individual adjustment of each segment's output to compensate for variations in LED performance and to distribute light uniformly across the fixture, preventing hotspots while maintaining high energy efficiency.
Solution Approach 2:
The system utilizes adjustable electrical parameters such as current and voltage for different LED modules to control their output. By varying these parameters, the luminance from each LED can be precisely controlled to achieve uniform overall illumination while maintaining the energy efficiency benefits of solid-state lighting.
3Illumination intensity
If a lens assembly with inner lens is used to diverge light, then light distribution into lateral zones is improved, but device complexity increases
Solution Approach 1:
The lens assembly is designed to perform multiple functions simultaneously: it diverges light to create lateral zones, maintains luminance uniformity, and controls glare. By integrating these functions into a single optical component rather than using separate elements, the system achieves improved light distribution without proportionally increasing device complexity.
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 results in a more uniform and comfortable lighting environment by distributing light widely without shadows or hotspots, enhancing luminance uniformity and reducing glare, while also allowing for tunable color temperature and circadian-friendly lighting.
Implementation Method 1
An inner lens is positioned between the LED elements and the lens assembly with the inner lens comprising: a first surface that faces towards the LED elements and having a cavity that extends over the LED elements... The inner lens is configured to direct light emitted from the LED assembly away from a center zone that is centered on the centerline and direct the light into first and second light zones
Implementation Method 2
combined with a reflector that provides both specular and diffuse reflection sections for improved uniformity and reduced glare
Data Source
AI summary
A light fixture with a troffer design. The light fixture includes a housing, LED assembly, and lens assembly. An inner lens can be positioned over the LED assembly to control the distribution of light. A reflector can be positioned over the LED assembly instead of the inner lens to control the light.