# US 2014/0153242 A1 · Aerodynamic LED Light Fixture

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- Number: US 2014/0153242 A1
- Document ID: US20140153242A1
- Status: Published application
- Kind: A1
- Application number: 13/908,530
- Filed: 2013-06-03
- Published: 2014-06-05
- Earliest claimed: 2006-09-30
- Assignees: Cree, Inc.
- Applicants: Cree, Inc.
- Inventors: Alan J. Ruud; Kurt S. Wilcox; Steven R. Walczak
- Web page: https://patentgrep.com/patent/US20140153242A1

## CPC

- F21S 8/043: {mounted by means of a rigid support, e.g. bracket or arm}
- F21S 8/086: {with lighting device attached sideways of the standard, e.g. for roads and highways}
- F21V 15/01: Housings, e.g. material or assembling of housing parts (F21V15/02 takes precedence {housings forming signs or letters G09F13/04})
- F21V 29/70: characterised by passive heat-dissipating elements, e.g. heat-sinks
- F21W 2131/103: of streets or roads
- F21Y 2105/10: comprising a two-dimensional [2D] array of point-like light-generating elements
- F21Y 2115/10: Light-emitting diodes [LED]
- F21S: NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21V: FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21W: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
- F21Y: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED

## Abstract

An LED light fixture having a light-emitting region and a perimetrical structure therearound. The light-emitting region includes at least one LED-array module supported by an LED heat sink open for air/water-flow. The perimetrical structure has first and second opposite substantially-aligned edge-adjacent portions each extending along the light-emitting region and meeting each other at a perimetrical edge. The first and second edge-adjacent portions converge toward each other at positions progressively closer to the perimetrical edge to form aerodynamic-drag-reducing cross-sectional profiles transverse to the fixture plane and extending in substantially all fixture-plane directions from the intersection of its two major principal axes.

## Claims

### Claim 1

An LED light fixture comprising:
two major principal axes in a fixture plane, the dimensions of the fixture in planes parallel to its third principal axis being substantially smaller than the largest dimensions parallel to the fixture plane;
a first outer side having a first central portion;
an opposite second outer side having a second central portion substantially aligned with the first central portion and encompassing a light-emitting region including at least one LED-array module supported by an LED heat sink open to air/water-flow; and
a perimetrical structure having first and second edge-adjacent portions meeting at a perimetrical edge and each having a boundary with the respective one of the first and second central portions, the first and second edge-adjacent portions converging toward each other at positions progressively closer to the perimetrical edge to form aerodynamic-drag-reducing cross-sectional profiles transverse to the fixture plane and extending in substantially all fixture-plane directions from the intersection of its two major principal axes, the first and second edge-adjacent portions together having aspect ratios of about 3 or less.

### Claim 2 (depends on 1)

The LED light fixture of claim 1 wherein the aspect ratio is about 1.25 or less.

### Claim 3 (depends on 1)

The LED light fixture of claim 1 wherein the cross-sectional profiles in substantially all planes containing the third principal axis are substantially the same.

### Claim 4 (depends on 1)

The LED light fixture of claim 1 wherein at least one of the edge-adjacent portions is substantially convex.

### Claim 5 (depends on 4)

The LED light fixture of claim 4 wherein both the edge-adjacent portions are substantially convex.

### Claim 6 (depends on 1)

The LED light fixture of claim 1 wherein:
the boundary between the second central and edge-adjacent portions define a reference plane; and
the maximum dimension between the first and second edge-adjacent portions in a direction perpendicular to the fixture plane occurs between the reference plane and the boundary of the first edge-adjacent portion and the first central portion.

### Claim 7 (depends on 1)

The LED light fixture of claim 1 further including a pole-mounting assembly which attaches the fixture to a light pole.

### Claim 8 (depends on 1)

The LED light fixture of claim 1 wherein:
the perimetrical structure forms a substantially water/air-tight chamber, the perimetrical structure having the first and second edge-adjacent portions extending therealong; and
at least one electronic LED driver is enclosed within the chamber.

### Claim 9 (depends on 1)

The LED light fixture of claim 1 wherein the largest dimensions of the fixture in the plane of the two largest principal axes are substantially equal.

### Claim 10 (depends on 9)

The LED light fixture of claim 9 wherein the cross-section in the plane of the two largest principal axes is substantially circular.

### Claim 11 (depends on 10)

The LED light fixture of claim 10 wherein the cross-sectional profiles in substantially all planes containing the third principal axes are substantially the same.

### Claim 12 (depends on 1)

The LED light fixture of claim 1 wherein the edge-adjacent portions are each convex.

### Claim 13

An LED light fixture comprising:
a light-emitting region including at least one LED-array module supported by an LED heat sink open for air/water-flow; and
a perimetrical structure having first and second opposite substantially-aligned edge-adjacent portions each extending along the light-emitting region and meeting each other at a perimetrical edge, the first and second edge-adjacent portions converging toward each other at positions progressively closer to the perimetrical edge to form aerodynamic-drag-reducing cross-sectional profiles transverse to the fixture plane and extending in substantially all fixture-plane directions from the intersection of its two major principal axes.

### Claim 14 (depends on 13)

The LED light fixture of claim 13 wherein the light-emitting region extending across at least 25% of an area within the perimetrical edge.

### Claim 15 (depends on 13)

The LED light fixture of claim 13 wherein at least one of the edge-adjacent portions is substantially convex.

### Claim 16 (depends on 13)

The LED light fixture of claim 13 wherein the cross-sectional profiles in substantially all planes containing the third principal axis are substantially the same.

### Claim 17 (depends on 13)

The LED light fixture of claim 13 wherein the cross-section in the plane of the two largest principal axes is substantially circular.

### Claim 18

A pole-mounted light fixture comprising:
two major principal axes in a fixture plane, the dimensions of the fixture in planes parallel to its third principal axis being substantially smaller than the largest dimensions parallel to the fixture plane;
a first outer side comprising a first central portion and a first edge-adjacent portion;
an opposite second outer side comprising (a) a second central portion substantially aligned with the first central portion and encompassing a light-emitting region, the light-emitting region including at least one LED-array module supported by an LED heat sink open for air/water-flow, and (b) a second edge-adjacent portion having a boundary with the second central portion, the boundary defining a reference plane;
a pole-mounting assembly for attaching the fixture to a light pole;
the first and second edge-adjacent portions converging toward each other at positions progressively closer to the perimetrical edge to form aerodynamic-drag-reducing cross-sectional profiles transverse to the fixture plane and extending in substantially all fixture-plane directions from the intersection of its two major principal axes, the first and second edge-adjacent portions together having aspect ratios of about 2 or less; and
the greatest distance perpendicular to the fixture plane between the first central portion and the reference plane is no more than 50% greater than the smallest distance therebetween.

### Claim 19 (depends on 18)

The LED light fixture of claim 18 wherein the aerodynamic-drag-reducing cross-sectional profiles extend in substantially all fixture-plane directions from the intersection of its two major principal axes.

### Claim 20 (depends on 18)

The LED light fixture of claim 18 wherein the first and second edge-adjacent portions together having aspect ratios of about 3 or less.