LED Retrofit Lens and Ballast Assembly for HID Field Lighting
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Solution Overview
Problem
Specialized lighting systems, such as those for sports fields and large exterior areas, face challenges in retrofitting from high-intensity discharge (HID) lamps to LED lamps due to disparate power requirements and non-standardized components, leading to issues like photometric and physical interference, reduced glare control, and structural integrity concerns.
Innovation Solution
The implementation of self-contained ballast driver assemblies and LED luminaires designed to fit within existing HID fixtures' footprints, using existing components and power regulating means, while incorporating uplighting lenses and aiming brackets to maintain lighting uniformity and adjust power supply for optimal performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If LED luminaires are designed to fit within existing HID fixtures' footprints, then ease of retrofit installation is improved, but device complexity increases due to adaptation requirements
Solution Approach 1:
The LED luminaire is designed with a universal mounting interface that fits within existing HID fixture footprints, allowing the same LED fixture to replace multiple different HID fixture types. The attachment portion includes mounting features that interface with standard HID fixture mounting holes and crossarm configurations, enabling one LED luminaire design to serve multiple retrofit applications without requiring custom adaptations for each fixture type.
2Adaptability or versatility
If self-contained ballast driver assemblies are used, then adaptability to different power requirements is improved, but device complexity increases
Solution Approach 1:
The ballast driver assembly is integrated directly into the LED luminaire housing, combining the power conversion functionality with the LED driver and heat sink into a single self-contained unit. This integration eliminates the need for separate external ballast drivers and reduces the number of connection points, thereby improving adaptability to different power requirements while actually reducing overall device complexity compared to separate component configurations.
3Stability of the object's composition
If uplighting lenses are incorporated, then lighting uniformity is improved, but device complexity increases
Solution Approach 1:
The lens assembly incorporates different optical zones with distinct light redirecting properties: a central zone for primary downward illumination and peripheral zones for upward light redirection. This local differentiation of optical properties within the single lens structure achieves uniform lighting distribution across the playing surface and surrounding areas without requiring multiple separate optical components, thereby maintaining lighting uniformity while minimizing 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 solution allows for cost-effective, energy-efficient LED retrofits that maintain or improve lighting quality, reduce glare, and ensure structural integrity, enabling seamless integration with existing systems without compromising aiming capabilities.
Implementation Method 1
a light directing portion that is elongated along a direction that is non-parallel to the first elongated aperture
Data Source
AI summary
An apparatus for retrofitting a HID lighting system includes using existing components of previously installed HID lighting systems such as its ballasts while replacing some capacitors to adjust the power supplied to a retrofit LED luminaire. Unused ballast drivers are removed, and a self-contained ballast driver assembly is mounted into the electronic control enclosure of the previously installed lighting system. Some of the retrofit LED luminaires include an uplighting lens, an optic, or a diffuser for providing uplight. An aiming bracket and an aiming plate allow for the horizontal aiming angle of a light luminaire to be set.