Lighting assembly with multiple lighting units

Patent metadata

Field	Value
Publication number	US-9947248-B2
Application number	US-201715676823-A
Country	US
Kind code	B2
Filing date	Aug 14, 2017
Priority date	Jul 30, 2012
Publication date	Apr 17, 2018
Grant date	Apr 17, 2018

Abstract

A lighting assembly includes an assembly body. A first lighting unit is attached to the assembly body. The first lighting unit includes a number of light emitting diodes (LEDs) and optical elements arranged over the LEDs such that each optical element overlies only one associated LED. The first lighting unit is configured to illuminate a substantially rectangular region. A second lighting unit is attached to the assembly body and spaced from the first lighting unit. The second lighting unit includes a number of LEDs and optical elements arranged over the plurality of LEDs such that each optical element overlies only one associated LED. The lighting assembly is configured to direct the light toward the substantially rectangular area such that the light illuminates the substantially rectangular area with a uniformity across the substantially rectangular area that achieves at most a 3:1 ratio of the average illumination to the minimum illumination.

First claim

What is claimed is:

1. A lighting assembly comprising:
an assembly body;
a first lighting unit attached to the assembly body, the first lighting unit including a first plurality of light emitting diodes (LEDs) and a first plurality of optical elements arranged over the first plurality of LEDs such that each optical element overlies only one associated LED, wherein the first lighting unit is configured to illuminate a substantially rectangular area; and
a second lighting unit attached to the assembly body and spaced from the first lighting unit, the second lighting unit including a second plurality of LEDs and a second plurality of optical elements arranged over the plurality of LEDs such that each optical element overlies only one associated LED, wherein the second lighting unit is configured to illuminate the substantially rectangular area so that the lighting assembly can illuminate substantially all of the substantially rectangular area so that the area can be illuminated without additional lighting;
wherein the optical elements are configured so that light emitted from the first and second lighting units illuminates only the substantially rectangular area with a uniformity that achieves at most a 3:1 ratio of the average illumination to the minimum illumination across the substantially rectangular area regardless of whether all or only some of the LEDs of the first and second pluralities of LEDs are functional.

2. The lighting assembly of claim 1 , wherein the optical elements are configured so that failure of one or more of the LEDs will cause an illumination level of light emitted from the lighting assembly to decrease.

3. The lighting assembly of claim 1 , wherein the optical elements are configured so that after failure of one or more of the LEDs a uniformity of the light emitted from the lighting assembly remains substantially unchanged.

4. The lighting assembly of claim 1 , wherein each optical element of the plurality of optical elements of the first and the second lighting units comprises a first part, a second part, and a third part, wherein the first part comprises a first curved surface, wherein the second part comprises a second curved surface that intersects with the first curved surface at a region between the first part and the second part, wherein the first part and the second part each have a peak that is spaced from the region between the first part and the second part, and wherein the third part extends beyond the region between the first part and the second part in a direction away from the associated LED.

5. The lighting assembly of claim 1 , wherein the substantially rectangular area has a length of twenty-four feet.

6. The lighting assembly of claim 1 , wherein the LEDs of the first plurality of LEDs are arranged in rows on a substrate and extend along a longitudinal axis in a plane of a first surface of the substrate, the lighting assembly further comprising a heat sink thermally coupled to a second surface of the substrate, the second surface opposite the first surface, the heat sink comprising a first section substantially parallel to the first surface of the substrate so that each and every LED of the first plurality of LEDs is separated from the heat sink by the substrate, the heat sink further comprising a plurality of fins extending away from the first section and substantially perpendicular thereto, each fin extending along an axis in the plane of the first surface of the substrate, the axis for each fin being substantially perpendicular to the longitudinal axis of the first surface of the substrate, wherein the fins are substantially flat.

7. The lighting assembly of claim 1 , wherein each optical element of the plurality of optical elements of the first and the second lighting units comprises:
a first side, a second side opposite the first side, and a third side perpendicular to the first side and the second side;
a first element comprising a first curved surface disposed at the first side;
a second element comprising a second curved surface disposed at the second side, wherein the second curved surface intersects with the first curved surface at an acute angle in a region between the first element and the second element; and
a third element disposed at the third side, wherein the third element extends beyond the region between the first element and the second element in a direction away from the associated LED.

8. The lighting assembly of claim 1 , further comprising a third lighting unit attached to the assembly body and spaced from the first lighting unit, the third lighting unit including a plurality of LEDs and a plurality of optical elements arranged over the plurality of LEDs such that each optical element overlies only one associated LED.

9. The lighting assembly of claim 1 , wherein the LEDs of the first lighting unit are arranged in only a first row and a second row on a first substrate, and wherein the LEDs of the second lighting unit are arranged in only a first row and a second row on a second substrate.

10. A lighting assembly comprising:
a first lighting unit that includes a first circuit board, a first plurality of LEDs arranged on the first circuit board, and a first plurality of optical elements; and
a second lighting unit that includes a second circuit board, a second plurality of LEDs arranged on the second circuit board, and a second plurality of optical elements;
wherein each optical element of the first plurality of optical elements and the second plurality of optical elements overlies a respective one of the LEDs, each optical element being configured to redirect light from the respective one of the LEDs;
wherein the lighting assembly is configured to simultaneously direct light from the first lighting unit and the second lighting unit toward only a substantially rectangular area;
wherein the lighting assembly is configured to direct the light toward the substantially rectangular area such that the light from the first lighting unit and from the second lighting unit illuminates substantially all of the substantially rectangular area with a uniformity across the substantially rectangular area that achieves at most a 3:1 ratio of the average illumination to the minimum illumination; and
wherein the optical elements are configured so that after failure of one or more LEDs of the lighting assembly, light from the first lighting unit and from the second lighting unit will continue to illuminate substantially all of the substantially rectangular area with a uniformity that achieves at most a 3:1 ratio of the average illumination to the minimum illumination across the substantially rectangular area.

11. The lighting assembly of claim 10 , wherein the lighting assembly further comprises a third lighting unit that includes a third circuit board, a third plurality of LEDs arranged on the third circuit board, and a third plurality of optical elements;
wherein each optical element of the third plurality of optical elements overlies a respective one of the LEDs of the third plurality of LEDs;
wherein the lighting assembly is configured to simultaneously direct light from the first lighting unit, the second lighting unit and the third lighting unit toward the substantially rectangular area; and
wherein the lighting assembly is configured so that if one or more LEDs of the third plurality of LEDs fails, the lighting assembly continue to illuminate substantially all of the substantially rectangular area with a uniformity that achieves at most a 3:1 ratio of the average illumination to the minimum illumination.

12. The lighting assembly of claim 10 , wherein a distance along a top boundary of the substantially rectangular area f

Assignees

• Ultravision Tech Llc

Inventors

• Auyeung David Siucheong
• Hall William Y
• Magarill Simon

Classifications

• F21Y2115/10

  Light-emitting diodes [LED] · CPC title

• F21Y2105/10

  comprising a two-dimensional [2D] array of point-like light-generating elements · CPC title

• F21W2131/40

  Lighting for industrial, commercial, recreational or military use · CPC title

• G09F13/02

  Signs, boards, or panels, illuminated by artificial light sources positioned in front of the insignia · CPC title

• F21Y2105/12

  characterised by the geometrical disposition of the light-generating elements, e.g. arranging light-generating elements in differing patterns or densities · CPC title