Low profile light having concave reflector and associated methods

• US 8,864,340 B2
• Filed: 11/14/2012
• Issued: 10/21/2014
• Est. Priority Date: 10/05/2009
• Status: Active Grant

• Current Assignee: Lighting Science Group Corporation (Pegasus Capital Advisors, L.P.)
• Original Assignee: Lighting Science Group Corporation (Pegasus Capital Advisors, L.P.)
• Inventors: Holland, Eric, Boomgaarden, Mark P., LeClair, Rick, DeVerter, David
• Primary Examiner(s): Alavi, Ali
• Application Number:
  US13/676,539
• Publication Number:
  US 20130120963A1
• Time in Patent Office: 706 Days
• Field of Search: 362/294, 362/147, 362/148, 362/150, 362/35, 362/373
• US Class Current: 362/294
• CPC Class Codes: F21K 9/62 using mixing chambers, e.g. housings with reflective walls
• CPC Class Codes: F21S 8/026 intended to be recessed in a ceiling or like overhead structure, e.g. suspended ceiling
• CPC Class Codes: F21S 8/04 intended only for mounting on a ceiling or the like overhead structures F21S8/02 takes precedence; details of ceiling bases F21V21/03
• CPC Class Codes: F21V 13/04 the elements being reflectors and refractors for vehicle rear lights F21S43/40
• CPC Class Codes: F21V 15/01 Housings, e.g. material or assembling of housing parts F21V15/02 takes precedence housings forming signs or letters G09F13/04
• CPC Class Codes: F21V 21/02 Wall, ceiling, or floor bases; Fixing pendants or arms to the bases F21V21/08 takes precedence; bases for movable standing lamps F21V21/06
• CPC Class Codes: F21V 21/04 Recessed bases
• CPC Class Codes: F21V 23/002 Arrangements of cables or conductors inside a lighting device, e.g. means for guiding along parts of the housing or in a pivoting arm
• CPC Class Codes: F21V 23/026 Fastening of transformers or ballasts
• CPC Class Codes: F21V 23/04 the elements being switches safety devices F21V25/00
• CPC Class Codes: F21V 23/0471 the sensor detecting the proximity, the presence or the movement of an object or a person
• CPC Class Codes: F21V 29/70 characterised by passive heat-dissipating elements, e.g. heat-sinks
• CPC Class Codes: F21V 5/00 Refractors for light sources characterised by cooling arrangements F21V29/504
• CPC Class Codes: F21V 7/0008 providing for indirect lighting
• CPC Class Codes: F21V 7/0066 specially adapted to cooperate with point like light sources; specially adapted to cooperate with light sources the shape of which is unspecified F21V7/16 - F21V7/30 take precedence
• CPC Class Codes: F21V 9/08 for producing coloured light, e.g. monochromatic; for reducing intensity of light with provision for controlling the colour F21V9/40
• CPC Class Codes: F21Y 2103/33 annular
• CPC Class Codes: F21Y 2113/13 comprising an assembly of point-like light sources
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]

Abstract

A luminaire to be carried by a lighting fixture. The luminaire may include a housing, a primary optic disposed within the housing having a reflective inner surface defining an optical chamber, a light source, and a heat sink defining an aperture through which light may propagate. The light source may include a plurality of light-emitting diodes (LEDs). The luminaire may further include a secondary optic positioned adjacent to the light source that may collimate and/or refract light emitted by the light source, and may form a seal between the light source and the optical chamber. The luminaire may further include a color conversion layer configured to change the color of light emitted by the light source.

Claims

1. A luminaire adapted to be carried by a light fixture comprising:

a housing;

a primary optic disposed within the housing having a reflective inner surface and a generally concave shape defining an optical chamber;

a light source; and

a heat sink being generally annular and defining an aperture;

wherein the light source is positioned in thermal communication with the heat sink; and

wherein light emitted by the light source enters the optical chamber incident upon the reflective inner surface of the primary optic, and is reflected through the aperture of the heat sink member.

2. A luminaire according to claim 1 wherein the light source comprises a plurality of light-emitting diodes (LEDs) disposed on an LED board.

3. A luminaire according to claim 2 wherein the LED board is generally annular;

wherein the plurality of LEDs are distributed about the LED board; and

wherein the heat sink comprises a generally annular support structure configured to permit the LED board and the plurality of LEDs to be disposed thereon.

4. A luminaire according to claim 2 wherein the plurality of LEDs comprises a first set of LEDs configured to emit light having a first color and a second set of LEDs configured to emit light having a second color.

5. A luminaire according to claim 2 further comprising a controller operably connected to the plurality of LEDs;

wherein the controller is configured to selectively operate each LED of the plurality of LEDs.

6. A luminaire according to claim 5 wherein the light emitted by each of the plurality of LEDs is reflected through the aperture of the heat sink in a radial direction generally opposite the radial direction of the LED relative to a longitudinal axis of the luminaire;

and wherein the controller is configured to selectively operate each LED of the plurality of LEDs between operating and non-operating states;

wherein light is emitted in the operating state and light is not emitted in the non-operating state, to selectively emit light in selected directions.

7. A luminaire according to claim 5 wherein the controller is configured to control the luminous intensity of light emitted from each LED of the plurality of LEDs by pulse-width modulation.

8. A luminaire according to claim 2 wherein the plurality of LEDs are disposed on a surface of the LED board;

wherein the LED board further comprises a reflective layer disposed on the same surface as the plurality of LEDs;

wherein the reflective layer is positioned so as not to occlude the plurality of LEDs; and

wherein the reflective layer reflects light incident thereupon into the optical chamber.

9. A luminaire according to claim 1 wherein the reflective inner surface reflects light incident thereupon at an intensity of at least about 95% of the original intensity of the incident light.

10. A luminaire according to claim 1 further comprising a secondary optic positioned adjacent to the light source;

wherein the secondary optic is configured to attach to the heat sink and form a seal between the light source and the optical chamber.

11. A luminaire according to claim 10 wherein the secondary optic is configured to at least one of collimate and refract light emitted by the light source.

12. A luminaire according to claim 10 wherein at least one of the primary optic and the secondary optic comprises a color conversion layer;

wherein the light source is configured to emit a source light within a first wavelength range;

wherein the color conversion layer converts the source light to a converted light within a second wavelength range; and

wherein the color conversion layer comprises a conversion material selected from the group consisting of phosphors, quantum dots, luminescent materials, and fluorescent materials.

13. A luminaire according to claim 1 further comprising a power conditioning unit;

wherein the power conditioning unit is configured to comply with power-over-Ethernet standards.

14. A luminaire according to claim 1 further comprising an attaching member;

wherein the primary optic further comprises an attaching member attachment structure positioned on the outer surface of the primary optic;

wherein the attaching member comprises a housing attachment section and a fixture attachment section; and

wherein the attaching member is configured to attach to the attaching member attachment structure at the housing attachment section and to the light fixture at the fixture attachment section.

15. A luminaire according to claim 1 further comprising:

an occupancy sensor having a field of view; and

a controller operably coupled to the light source and in communication with the occupancy sensor;

wherein the occupancy sensor is configured to determine whether an object is within the field of view of the occupancy sensor;

wherein the occupancy sensor is configured to transmit a positive indication when an object is determined to be within the field of view; and

wherein the controller is configured to operate the light source to illuminate the light source upon receiving the positive indication.

16. A luminaire according to claim 1 further comprising:

a network interface configured to enable communication with a network; and

a controller operably coupled to the light source and in communication with the network interface;

wherein the network interface is operable to receive communications across the network and provide an instruction to the controller; and

wherein the controller operates the light source responsive to the instruction received from the network interface.

17. A luminaire according to claim 16 wherein the network comprises a plurality of luminaires;

wherein the controller is operable to send an instruction to the network interface; and

wherein the network interface is operable to transmit the instruction to each of the plurality of luminaires across the network.

18. A luminaire according to claim 17 further comprising an occupancy sensor having a field of view;

wherein the controller is positioned in communication with the occupancy sensor;

wherein the occupancy sensor is configured to determine whether an object is within the field of view of the occupancy sensor;

wherein the occupancy sensor transmits a positive indication when an object is determined to be within the field of view;

wherein the controller is configured to operate the light source responsive to receiving the positive indication;

wherein the controller is configured to transmit an instruction to illuminate the light source upon receiving the positive indication; and

wherein the network interface is configured to transmit the instruction to each of the plurality of luminaires across the network.

19. A luminaire according to claim 1 wherein the light source is positioned so as to be obscured from view from any point external the luminaire.

20. A luminaire adapted to be carried by a light fixture comprising:

a housing;

a primary optic disposed within the housing having a reflective inner surface and a generally concave shape defining an optical chamber;

a light source;

a heat sink being generally annular and defining an aperture;

a secondary optic positioned adjacent to the light source; and

an attaching member;

wherein the light source is positioned in thermal communication with the heat sink;

wherein light emitted by the light source enters the optical chamber incident upon the reflective inner surface of the primary optic, and is reflected through the aperture of the heat sink member;

wherein the secondary optic is configured to attach to the heat sink and form a seal between the light source and the optical chamber;

wherein the primary optic further comprises an attaching member attachment structure positioned on the outer surface of the primary optic;

wherein the attaching member comprises a housing attachment section and a fixture attachment section; and

wherein the attaching member is configured to attach to the attaching member attachment structure at the housing attachment section and to the light fixture at the fixture attachment section.