# US 8,770,779 B2 · Small aperture recessed wall wash downlight

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- Number: US 8,770,779 B2
- Document ID: US8770779B2
- Status: Granted
- Kind: B2
- Application number: 13/537,466
- Filed: 2012-06-29
- Published: 2014-01-02
- Granted: 2014-07-08
- Earliest claimed: 2012-06-29
- Assignees: Hubbell Incorporated
- Applicants: Connie A. Steadman; Shawn A. Wilcox
- Inventors: Connie A. Steadman; Shawn A. Wilcox
- Web page: https://patentgrep.com/patent/US8770779B2

## CPC

- F21S 8/02: of recess-mounted type, e.g. downlighters (specially adapted for vehicle exteriors F21S41/00-F21S45/00)
- F21S 8/022: {intended to be recessed in a floor or like ground surface, e.g. pavement or false floor}
- F21V 21/04: Recessed bases
- G02B 6/02: Optical fibres with cladding {with or without a coating}
- 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
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

A wall wash lighting fixture includes a light source, a light pipe below the light source and a reflector offset from and surrounding the lower end of the light pipe. The lower end of the light pipe has an oblique, light-emitting face that provides uniform wall illumination up to a high vertical angle. The reflector faces substantially away from the wall and provides room-side illumination below about 45 vertical degrees. A preferred embodiment is suited for retrofit recessed installation, especially where small-aperture downlights are desired.

## Claims

### Claim 1

A wall wash lighting fixture for installation near a wall, comprising:
a light source;
a light pipe below the light source, the light pipe comprising a light-receiving upper end adjacent the light source and a lower end having a slanted light-emitting face with a high point and a low point, the slanted face obliquely facing the wall with said high point closer to the wall than said low point when the lighting fixture is installed; and
a reflector at least partially surrounding the lower end of the light pipe from said high point downward toward said low point, the reflector facing substantially away from the wall when the lighting fixture is installed to redirect a portion of the light emitted by the slanted face of the light pipe away from the wall.

### Claim 2 (depends on 1)

The wall wash lighting fixture of claim 1, wherein said slanted face is oval.

### Claim 3 (depends on 2)

The wall wash lighting fixture of claim 2, wherein the light pipe comprises a circular cylinder.

### Claim 4 (depends on 3)

The wall wash lighting fixture of claim 3, wherein said upper end is substantially circular.

### Claim 5 (depends on 3)

The wall wash lighting fixture of claim 3, wherein said slanted face is disposed at an angle of about 45° to a central longitudinal axis of the light pipe.

### Claim 6 (depends on 1)

The wall wash lighting fixture of claim 1, wherein the overall length of the light pipe is about 2.5 times its average width.

### Claim 7 (depends on 1)

The wall wash lighting fixture of claim 1, wherein said slanted face comprises a plurality of light-refracting elements.

### Claim 8 (depends on 7)

The wall wash lighting fixture of claim 7, wherein said slanted face comprises a lenticular array.

### Claim 9 (depends on 8)

The wall wash lighting fixture of claim 8, wherein the lenticular array comprises 90° prisms.

### Claim 10 (depends on 9)

The wall wash lighting fixture of claim 9, wherein the lenticular array comprises about 75 prisms per inch.

### Claim 11 (depends on 1)

The wall wash lighting fixture of claim 1, wherein said slanted face is configured and positioned to emit light toward the wall up to about 83° from the vertical.

### Claim 12 (depends on 1)

The wall wash lighting fixture of claim 1, further comprising a shield surrounding the light pipe for substantially preventing lateral leakage of light from the fixture.

### Claim 13 (depends on 12)

The wall wash lighting fixture of claim 12, wherein the shield comprises a reflective inner surface for inwardly directing light that escapes from the light pipe before reaching said slanted face.

### Claim 14 (depends on 1)

The wall wash lighting fixture of claim 1, wherein the reflector comprises an arcuate reflective surface.

### Claim 15 (depends on 14)

The wall wash lighting fixture of claim 14, wherein the reflector completely surrounds the lower end of the light pipe.

### Claim 16 (depends on 14)

The wall wash lighting fixture of claim 14, wherein the reflector is configured and positioned such that substantially all of the light it redirects emerges from the fixture below about 45° from the vertical.

### Claim 17

A wall wash lighting fixture for installation in a ceiling near a wall, comprising:
a housing having a central longitudinal housing axis;
a light source within the housing having a central longitudinal light source axis substantially parallel to and offset from said housing axis;
a light pipe within the housing and below the light source, the light pipe having a central longitudinal light pipe axis substantially coaxial with said light source axis and comprising a light-receiving upper end adjacent the light source and a lower end having a slanted light-emitting face obliquely facing the wall when the lighting fixture is installed; and
a reflector within the housing at least partially surrounding the lower end of the light pipe and facing substantially away from the wall when the lighting fixture is installed to redirect a portion of the light emitted by the slanted face of the light pipe away from the wall, the reflector having a central longitudinal reflector axis substantially coaxial with said housing axis.

### Claim 18 (depends on 17)

The wall wash lighting fixture of claim 17, wherein said slanted face is oval.

### Claim 19 (depends on 18)

The wall wash lighting fixture of claim 18, wherein the light pipe comprises a circular cylinder.

### Claim 20 (depends on 17)

The wall wash lighting fixture of claim 17, wherein said slanted face is disposed at an angle of about 45° to a central longitudinal axis of the light pipe.

### Claim 21 (depends on 17)

The wall wash lighting fixture of claim 17, wherein the overall length of the light pipe is about 2.5 times its average width.

### Claim 22 (depends on 17)

The wall wash lighting fixture of claim 17, wherein said slanted face comprises a plurality of light-refracting elements.

### Claim 23 (depends on 22)

The wall wash lighting fixture of claim 22, wherein said slanted face comprises a lenticular array.

### Claim 24 (depends on 23)

The wall wash lighting fixture of claim 23, wherein the lenticular array comprises 90° prisms.

### Claim 25 (depends on 24)

The wall wash lighting fixture of claim 24, wherein the lenticular array comprises about 75 prisms per inch.

### Claim 26 (depends on 17)

The wall wash lighting fixture of claim 17, wherein said slanted face is configured and positioned to emit light toward the wall up to about 83° from the vertical.

### Claim 27 (depends on 17)

The wall wash lighting fixture of claim 17, further comprising a shield surrounding the light pipe for substantially preventing lateral leakage of light from the fixture.

### Claim 28 (depends on 17)

The wall wash lighting fixture of claim 17, wherein the reflector comprises an arcuate reflective surface.

### Claim 29 (depends on 28)

The wall wash lighting fixture of claim 28, wherein the reflector completely surrounds the lower end of the light pipe.

### Claim 30 (depends on 28)

The wall wash lighting fixture of claim 28, wherein the reflector is configured and positioned such that substantially all of the light it redirects emerges from the fixture below about 45° from the vertical.