LED Troffer Light Uniformity via Gradient Coating
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Solution Overview
Problem
Existing LED troffer lights suffer from non-uniform light distribution, with intense light regions surrounded by dimmer areas, known as hot spots, which can cause discomfort to users and do not match the light distribution patterns of incandescent illumination devices.
Innovation Solution
The design incorporates a troffer light fixture with a concave body featuring sidewall reflectors and protruding structures that house elongate tubular light modules with diffuser caps coated with varying white particle concentrations to distribute light uniformly, reducing glare and eliminating hot spots.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If conventional LED troffer lights are used, then energy efficiency and device lifetime are improved, but light output uniformity deteriorates with hot spots and intensely lit regions
Solution Approach 1:
The patent applies local quality by varying the concentration of white particles in different regions of the coating applied to the diffuser cap. Specifically, the coating has a higher white particle concentration in the center region and lower concentration toward the edges, creating region-specific light diffusion properties that compensate for the inherently non-uniform LED light distribution and eliminate hot spots
2Use of energy by moving object
If discrete LED devices are used in troffer lights, then energy consumption is reduced, but light distribution uniformity deteriorates with multiple intensely lit regions
Solution Approach 1:
The patent applies parameter changes by modifying the optical properties of the diffuser cap through a coating with spatially varying white particle concentration. This continuous gradient in particle concentration (higher in center, lower at edges) transforms the discrete light sources into a uniform illumination pattern, effectively blending the output of multiple LED devices
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 achieves a more uniform light output across all directions, reducing glare and eliminating hot spots, providing a lighting experience similar to incandescent bulbs.
Implementation Method 1
a coating film operable to reflect and diffuse light emitted by the light-emitting diodes
Implementation Method 2
The coating may include a highest concentration of white particles at an apex of the diffuser cap and may include a lowest concentration of white particles at an edge of the diffuser cap
Data Source
AI summary
The present disclosure provides a lighting instrument. The lighting instrument includes a recessed light fixture, for example a troffer light or a batten light. The light fixture includes a plurality of light-emitting diode (LED) devices located on a board. The light fixture also includes a diffuser cap located on the board and housing the LED devices therein. The diffuser cap includes a plurality of coating regions. Each coating region is coated by a film containing white particles. The white particles can reflect and diffuse light emitted by the LED devices. The film in each coating region has a different white particle concentration level than other coating regions.