Tunable lighting apparatus

• US 9,366,409 B2
• Filed: 01/11/2013
• Issued: 06/14/2016
• Est. Priority Date: 05/06/2012
• 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., Kelley, Ryan
• Primary Examiner(s): Donovan, Lincoln
• Assistant Examiner(s): Chen, Patrick
• Application Number:
  US13/739,893
• Publication Number:
  US 20130293148A1
• Time in Patent Office: 1,250 Days
• Field of Search: 315/297
• US Class Current: 1/1
• CPC Class Codes: F21K 9/23 Retrofit light sources for lighting devices with a single fitting for each light source, e.g. for substitution of incandescent lamps with bayonet or threaded fittings
• CPC Class Codes: F21V 19/006 of point-like light sources, e.g. incandescent or halogen lamps, with screw-threaded or bayonet base of sources having contact pins, wires or blades F21V19/0005; of LEDs or sources mounted on printed-circuit board F21V19/001
• CPC Class Codes: F21V 29/77 with essentially identical diverging planar fins or blades, e.g. with fan-like or star-like cross-section
• CPC Class Codes: F21V 29/83 the elements having apertures, ducts or channels, e.g. heat radiation holes
• CPC Class Codes: F21Y 2101/00 Point-like light sources
• CPC Class Codes: F21Y 2105/10 comprising a two-dimensional array of point-like light-generating elements
• CPC Class Codes: F21Y 2105/12 characterised by the geometrical disposition of the light-generating elements, e.g. arranging light-generating elements in differing patterns or densities
• CPC Class Codes: F21Y 2113/13 comprising an assembly of point-like light sources
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H05B 45/10 Controlling the intensity of the light
• CPC Class Codes: H05B 45/325 Pulse-width modulation [PWM]

Abstract

A luminaire provides light having a distribution pattern with high center beam candle power and a gradual gradient across a wide area. The luminaire includes a light source having first and second sets of light emitting elements selected and positioned to achieve the desired light distribution pattern. The luminaire further includes an optic configured to refract light emitted from the light source to achieve the desired light distribution pattern.

Claims

1. A luminaire comprising:

a housing;

a light source carried by the housing comprising a first set of light emitting elements and a second set of light emitting elements; and

a lens assembly carried by the housing, the lens assembly comprising a lens comprising;

a first refraction section having a surface smoothness within a first range from 4 microinches to 8 microinches, and

a second refraction section having a surface smoothness within a second range from 8 microinches to 100 microinches,

wherein the first range is not equal to the second range;

wherein the first set of light emitting elements is configured to emit light at a first beam angle of about 18 degrees;

wherein the second set of light emitting elements is configured to emit light at a second beam angle of about 47 degrees;

wherein the light emitted by the first set of light emitting elements and the second set of light emitting elements combine to form a combined light;

wherein the combined light has a center beam and a gradient; and

wherein the center beam has a greater candle power than the gradient.

2. A luminaire according to claim 1 wherein the first set of light emitting elements comprises a white light-emitting diode (LED);

and wherein the second set of light emitting elements comprises a red LED.

3. A luminaire according to claim 1 wherein the first set of light emitting elements emit light having a luminous intensity of at least about 7.4 candelas per lumen.

4. A luminaire according to claim 1 wherein the second set of light emitting elements emit light having a luminous intensity of about at least 0.9 candelas per lumen.

5. A luminaire according to claim 1 further comprising a controller that is configured to operate each of the first set of light emitting elements and the second set of light emitting elements independently.

6. A luminaire according to claim 5 wherein the controller is configured to receive an input;

and wherein the controller is programmable to operate the first set of light emitting elements and the second set of light emitting elements responsive to the input.

7. A luminaire according to claim 6 wherein the input is an electrical signal transmitted to the controller via an electrical connector of the housing.

8. A luminaire according to claim 6 wherein the controller is programmable to control the luminous intensity of light emitted by each of the first set of light emitting elements and the second set of light emitting elements through pulse-width modulation.

9. A luminaire according to claim 1 wherein the lens assembly further comprises one or more light source receiving members.

10. A luminaire according to claim 9 wherein the light source receiving members are configured to comprise one or more refraction properties selected from a group consisting of beam angle and luminous intensity.

11. A luminaire comprising:

a housing;

a light source carried by the housing comprising a first set of light emitting elements and a second set of light emitting elements;

a lens assembly carried by the housing, the lens assembly comprising a lens comprising;

a first refraction section having a surface smoothness within a first range from 4 microinches to 8 microinches, and

a second refraction section having a surface smoothness within a second range from 8 microinches to 100 microinches; and

a controller;

wherein the first set of light emitting elements is configured to emit light at a first beam angle of about 18 degrees;

wherein the second set of light emitting elements is configured to emit light at a second beam angle of about 47 degrees;

wherein the light emitted by the first set of light emitting elements and the second set of light emitting elements combine to form a combined light;

wherein the controller is configured to operate each of the first set of light emitting elements and the second set of light emitting elements independently;

wherein the controller is configured to receive an input;

wherein the controller is programmable to operate the first set of light emitting elements and the second set of light emitting elements responsive to the input; and

wherein the controller is programmed to operate the first set of light emitting elements and the second set of light emitting elements so as to alter center beam candle power and a gradient of the combined light.

12. A luminaire according to claim 11 wherein the input is an electrical signal transmitted to the controller via an electrical connector of the housing.

13. A luminaire according to claim 11 wherein the lens assembly further comprises one or more light source receiving members.

14. A luminaire according to claim 13 wherein the light source receiving members are configured to comprise one or more refraction properties selected from a group consisting of beam angle and intensity.

15. A luminaire according to claim 11 wherein the controller is programmable to control the luminous intensity of light emitted by each of the first set of light emitting elements and the second set of light emitting elements through pulse-width modulation.