LED Luminaire Optics for Sharp Cutoff Beam Control
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Solution Overview
Problem
Conventional lighting systems, particularly those using light emitting diodes (LEDs) in luminaires, face limitations in achieving precise and sharp light cutoff to prevent light from spilling into undesired directions, failing to meet specifications such as those required by the LEED program and resulting in inefficient light distribution.
Innovation Solution
An optical assembly comprising a base with lenses and reflectors, where the reflectors have a curved surface that directs light emitted by LEDs towards a desired direction while preventing light from leaking into undesired areas, utilizing a combination of dome-shaped lenses and offset LED placement to achieve extreme light cutoff and improved light coverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional lighting systems are used, then light distribution is simple and device complexity is low, but light cutoff precision is insufficient and light trespass occurs
Solution Approach 1:
The optical assembly is divided into multiple functional segments: individual lenses for each LED, separate reflectors with specific curvature, and modular mounting structures. This segmentation allows each component to be optimized for its specific function (light direction, cutoff, reflection) while maintaining overall system precision without excessive complexity.
Solution Approach 2:
The reflectors are designed with asymmetric curved surfaces rather than symmetric shapes, allowing precise control of light cutoff angles. The asymmetric geometry enables different light distribution patterns in different directions, achieving sharp cutoff precision where traditional symmetric designs fail.
2Manufacturing precision
If offset LED placement is used with curved reflectors, then light cutoff precision is improved, but device complexity increases
Solution Approach 1:
The LEDs are pre-positioned in offset locations within the lens cavities during the manufacturing process, and the curved reflectors are pre-formed with specific geometries. This preliminary positioning eliminates the need for complex field adjustments and simplifies final assembly, as components are designed to fit together in predetermined configurations.
Solution Approach 2:
The invention changes the positional parameters of LEDs (offset placement) and the geometric parameters of reflectors (curved surfaces with specific radii) to achieve precise light direction control. These parameter modifications are incorporated into the design specifications, making the complex configuration manageable through standardized manufacturing processes.
3Stability of the object's composition
If curved reflectors are used to direct light, then light distribution uniformity is improved, but manufacturing complexity increases
Solution Approach 1:
Curved or spheroidal reflector surfaces are employed to achieve uniform light distribution. The curvature of these reflectors naturally directs light rays to converge or diverge in controlled patterns, providing stable and uniform illumination across the target area while maintaining manufacturability through standard forming processes.
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 optical assembly achieves a more precise and effective light cutoff, directing a higher percentage of light towards the desired area while minimizing light trespass, as demonstrated by improved backlight control and increased illuminance uniformity, with the ability to absorb or redirect light to prevent unwanted illumination.
Implementation Method 1
The curved surface can be configured to direct light emitted by the at least one of the plurality of LEDs toward the first side and prevent the light from leaking toward a second side of the at least one reflector that is opposite the first side
Implementation Method 2
Each lens may have a dome shape with a central or optical axis perpendicular to a plane of the base
Data Source
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AI summary
An optical assembly and a luminaire with extreme cutoff beam control optics. The optical assembly includes a base, a plurality of lenses, a plurality of light emitting diodes (LED) positioned to emit light into the lenses, and a reflector having a reflective surface disposed adjacent at least one of the plurality of LEDs. The optical axis of one or more of the LEDs may be offset from a central axis of the respective lens in which it emits light. The reflective surface of the reflector may extend from the base over the one or more of the LEDs and beyond the optical axis of the one or more LEDs to direct light in a desired direction or toward a selected area (e.g., a street) and cut off light directed in an undesirable direction or area (e.g., a house).