Retrofit LED Troffer with Movable Reflectors for Heat and Color Control
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Solution Overview
Problem
Current troffer-style lighting fixtures face challenges in efficiently managing heat from high power LEDs and achieving uniform color mixing, especially when retrofitting from fluorescent to LED lighting, due to heat dissipation issues in reduced plenum spaces and optical losses from diffusive materials.
Innovation Solution
The design incorporates a direct troffer-style fixture with movable end and back reflectors, a lens structure, and a retrofit troffer assembly that can be easily installed and adjusted, featuring a removable back reflector and interlocking components to improve heat management and color uniformity by redirecting light efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If high power LEDs are used to increase lighting efficiency, then energy consumption is reduced, but heat dissipation becomes more difficult in reduced plenum spaces
Solution Approach 1:
The heat dissipation system is segmented into multiple independent heat sinks distributed across the fixture structure, with separate thermal pathways for different LED modules. This allows heat to be dissipated through multiple routes simultaneously, improving overall heat management in constrained plenum spaces while maintaining high power LED operation
Solution Approach 2:
The patent utilizes the plenum space above the ceiling as an additional thermal dimension for heat dissipation. By extending heat sinks into the plenum area and using the vertical space for thermal management, the system effectively adds a third dimension (vertical z-axis) to heat dissipation pathways, allowing high power LEDs to operate without overheating even when horizontal plenum space is reduced
2Stability of the object's composition
If diffusive materials are used to achieve uniform color mixing, then color uniformity is improved, but optical losses increase
Solution Approach 1:
The patent extracts the diffusive function from bulk diffusive materials and implements it through engineered optical surfaces and reflectors. By using reflective surfaces with specific geometries to redirect and mix light paths, the system achieves color uniformity without the substantial optical losses associated with thick diffusive materials, thereby reducing energy loss while maintaining color consistency
Solution Approach 2:
The patent replaces mechanical diffusive materials with optically-engineered surface structures and reflective geometries. Instead of using physically thick diffusers that absorb and scatter light (causing optical losses), the system uses precisely shaped reflectors and optical surfaces to redirect light paths, achieving the same color mixing effect with minimal energy loss
3Adaptability or versatility
If retrofittable fixture design is used to accommodate existing structures, then adaptability is improved, but installation complexity increases
Solution Approach 1:
The retrofittable fixture is divided into modular segments that can be independently installed and configured. Each module contains complete functional elements (LED arrays, heat sinks, optical components), allowing installers to work with discrete, manageable units rather than a single complex assembly, thereby reducing installation complexity while maintaining adaptability to various existing ceiling structures
Solution Approach 2:
The fixture design incorporates universal mounting interfaces and standardized connection points that work across multiple ceiling types (suspect, recessed, surface-mounted). By designing components with multi-functional mounting capabilities and standardized interfaces, the system achieves broad adaptability to existing structures without requiring complex custom installation procedures for each ceiling type
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 solution allows for efficient heat dissipation and improved color uniformity, reducing installation complexity and optical losses, while accommodating existing structures, thus enhancing the performance and adaptability of LED lighting fixtures.
Implementation Method 1
specular reflector systems to reflect light emitted by the LED chips
Implementation Method 2
The surrounding phosphor material 'downconverts' some of the blue light, changing it to yellow light
Implementation Method 3
elements of the troffer on the back side dissipate heat generated by the light source into the plenum where air can be circulated to facilitate the cooling mechanism
Data Source
AI summary
A direct troffer-style fixture for solid state light sources for use in these fixtures. Embodiments of the present invention provide a direct troffer-style fixture that is particularly well-suited for retrofit structures. The fixture comprises a retrofit troffer assembly that is removably attached within a T grid or pan structure. The retrofit fixture can be installed in two pieces: a first including a lens structure, a back reflector and 2 end reflectors; and the second component including a second portion of the back reflector. An interior space created by the lens structure houses light emitters and in some embodiments, a light engine and/or additional electronics. One or both of the end reflectors may be movable, slidable and/or rotatable, to accommodate installation. The back reflector covers most of the interior surfaces of the troffer fixture to direct more light out of the fixture.