LED Downlight Reflector with Kicker Scoop for Uniform Wall Wash
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Solution Overview
Problem
Traditional downlight wall-wash reflectors using parabolic shapes with LED light sources often result in a majority of light being reflected into a small circular 'hot spot' pattern, failing to achieve uniform light distribution on walls and creating glare issues.
Innovation Solution
A downlight fixture design incorporating a parabolic reflector with a small-faceted scoop mounted at the top, redirecting light from the LED source towards the opposing side of the parabolic reflector, and further reflecting it towards the upper area of an adjacent wall, achieving an evenly spread pattern with reduced glare.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a traditional parabolic reflector is used with an LED light source at the top, then the light is reflected toward the wall, but the light distribution creates a small circular 'hot spot' pattern instead of uniform distribution
Solution Approach 1:
The reflector is divided into multiple functional zones: an upper scoop portion for capturing light from the LED, a middle transition zone, and a lower parabolic section for wall illumination. This segmentation allows each zone to perform its specific function optimally, transforming the hot spot into a diffuse, uniform wall wash pattern.
Solution Approach 2:
Different portions of the reflector have different geometric properties - the upper scoop has a shallow curvature to capture light, while the lower parabolic section has a steeper curvature to direct light toward the wall. This local variation in geometry ensures uniform light distribution across the wall surface rather than concentrating it in a hot spot.
2Illumination intensity
If the LED light source is positioned at the center of the parabolic reflector, then light is distributed more uniformly, but the fixture cannot achieve proper wall-wash illumination
Solution Approach 1:
The reflector design accommodates the LED light source at the focal point while maintaining the geometric integrity needed for wall illumination. The dynamic geometry of the parabolic shape with added scoop portion allows the light source to be positioned optimally for both uniform distribution and wall-wash effect.
3Object-generated harmful factors
If additional side reflective kicker is added to the parabolic reflector, then light is directed toward the wall, but the majority of light is reflected into a small circular pattern
Solution Approach 1:
The invention merges the scoop portion and parabolic reflector into a single integrated structure that works together to redirect light. The scoop captures light from the LED while the parabolic section distributes it uniformly across the wall, eliminating the need for separate side kickers that would create hot spots.
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 design provides an evenly spread light pattern on walls with reduced glare, effectively eliminating the 'hot spot' issue and ensuring uniform illumination across surfaces.
Implementation Method 1
The scoop is mounted to a top end of the parabolic reflector and has a curvature for reflecting light, received from the LED light source, towards an opposing side of the parabolic reflector. The light is, then, reflected again from the parabolic reflector towards an upper area of an adjacent wall.
Data Source
AI summary
A downlight reflector assembly for a light-emitting diode (LED) light source includes a kicker reflector and an upper scoop. The kicker reflector has a reflector wall extending between a small top opening and a large bottom opening along a transverse axis. The reflector wall has an internal surface with an illuminated area and a non-illuminated area. The upper scoop is mounted in the small top opening of the kicker reflector and has a reflective multi-faceted surface with a concave curvature relative to the LED light source. The upper scoop extends from the top opening in part along the transverse axis and covering a portion of the top opening. The multi-faceted surface faces both of the illuminated area of the kicker reflector and the top opening for reflecting light rays received through the top opening towards the illuminated area.