HORTICULTURAL LIGHTING DEVICE

• US 20190059237A1
• Filed: 02/03/2017
• Published: 02/28/2019
• Est. Priority Date: 02/04/2016
• Status: Active Grant

• Current Assignee: FAT JEFF Limited
• Original Assignee: FAT JEFF Limited
• Inventors: Johnson, Andrew
• Granted Patent: US 11,089,736 B2
• Time in Patent Office: Days
• CPC Class Codes: A01G 7/045 with electric lighting
• CPC Class Codes: A01G 9/249 Lighting means with special arrangements for promoting growth A01G7/045
• CPC Class Codes: F21S 4/28 rigid, e.g. LED bars
• 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 23/003 the elements being electronics drivers or controllers for operating the light source, e.g. for a LED array
• CPC Class Codes: F21V 23/009 the casing being inside the housing of the lighting device
• CPC Class Codes: F21V 29/503 of light sources cooling arrangements structurally associated with gas-discharge or vapour-discharge lamps H01J61/52; cooling arrangements structurally associated with electric incandescent lamps H01K1/58; cooling arrangements structurally associated with light-emitting diodes H01L33/64
• CPC Class Codes: F21V 29/763 the planes containing the fins or blades having the direction of the light emitting axis
• CPC Class Codes: F21V 31/005 Sealing arrangements therefor
• CPC Class Codes: F21V 5/04 of lens shape
• CPC Class Codes: F21Y 2105/16 square or rectangular, e.g. for light panels
• 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: G02B 3/0056 arranged along two different directions in a plane, e.g. honeycomb arrangement of lenses G02B3/0043 takes precedence; miniaturised objectives for electronic devices employing wafer level optics G02B13/0085
• CPC Class Codes: H05B 45/20 Controlling the colour of the light
• CPC Class Codes: H05B 47/105 in response to determined parameters
• CPC Class Codes: H05B 47/11 by determining the brightness or colour temperature of ambient light
• CPC Class Codes: H05B 47/155 Coordinated control of two or more light sources
• CPC Class Codes: H05B 47/16 by timing means
• CPC Class Codes: Y02B 20/40 Control techniques providing energy savings, e.g. smart controller or presence detection
• CPC Class Codes: Y02P 60/14 : Measures for saving energy, e.g. in green houses

Abstract

A lighting device suitable for promoting plant growth, said lighting device comprising: —(i) a first group of LEDs comprising a plurality of LEDs adapted to generate a first emission spectrum having a peak between 450-460 nm (royal blue light); (ii) a second group of LEDs comprising a plurality of LEDs adapted to generate a second emission spectrum having a peak between 630-670 nm (crimson light); (iii) a third group of LEDs comprising a plurality of LEDs adapted to generate a third emission spectrum having a peak between 720-740 nm (cherry red light); (iv) a fourth group of LEDs comprising a plurality of LEDs adapted to generate white light; wherein the intensity of the light output generated by each group of LEDs is adjustable independently of the other groups.

Claims

1. A lighting device suitable for promoting plant growth, said lighting device comprising:

—

(i) a first group of LEDs comprising a plurality of LEDs adapted to generate a first emission spectrum having a peak between 450-460 nm (royal blue light);

(ii) a second group of LEDs comprising a plurality of LEDS adapted to generate a second emission spectrum having a peak between 630-670 nm (crimson light);

(iii) a third group of LEDs comprising a plurality of LEDs adapted to generate a third emission spectrum having a peak between 720-740 nm (cherry red light);

(iv) a fourth group of LEDs comprising a plurality of LEDs adapted to generate white light;

the intensity of the light output generated by each group of LEDs being adjustable independently of the other groups;

wherein the lighting device further comprises a sensor array adapted to measure the density of plant growth.

2. The lighting device according to claim 1 wherein the white light emitted by the fourth group of LEDs has a colour temperature between 4000-7000K.

3. The lighting device according to claim 1 wherein the white light emitted by the fourth group of LEDs has a colour temperature between 5000-6000 K.

4. The lighting device according to claim 1 wherein the ratio of the number of LEDs from each group of LEDs in the device is as follows:

—

Group 1;

6+/−

3

Group 2;

10+/−

5

Group 3;

4+/−

2

Group 4;

16+/−

8.

5. The lighting device according to claim 4 wherein ratio of the number of LEDs from each group of LEDs in the device is as follows:

—

Group 1;

6+/−

1

Group 2;

10+/−

2

Group 3;

4+/−

1

Group 4;

16+/−

6.

6. The lighting device according to claim 4 wherein ratio of the number of LEDs from each group of LEDs in the device is as follows:

—

Group 1;

6

Group 2;

10

Group 3;

4

Group 4;

16.

7. The lighting device according to claim 4 wherein ratio of the number of LEDs from each group of LEDs in the device is as follows:

—

Group 1;

6

Group 2;

8

Group 3;

4

Group 4;

10.

8. The lighting device according to claim 1 wherein the device is devoid of LEDs having a peak in their emission spectrum between 500-600 nm (green light).

9. The lighting device according to claim 1 wherein the device further comprising dimming/control circuitry adapted to allow the emission spectrum of the light emitted by the device to be controlled by an operator.

10. The lighting device according to claim 1

wherein the lighting device further comprises a housing comprising a main body and a heat sink, the LEDs being mounted in thermal contact with the heat sink and the heat sink being in good thermal contact with the main body, such that heat from the heat sink is dissipated through the main body.

19. The lighting device according to claim 10 wherein the lighting device further comprises a waterproof seal located between the main body and the heat sink which does not interfere with heat conduction between the heat sink and the main body.

20. The lighting device according to claim 1 wherein the lighting device further comprises an array of lenses, one lens for each LED, wherein each lens comprises a substantially hollow substantially hemispherical lens having a light entering region and a light emitting region, the light entering region located in the hollow of the hemisphere incorporating a plurality convex refractive surfaces.

11-18. -18. (canceled)

21. A lighting device suitable for promoting plant growth, said lighting device comprising:

—

(i) a first group of LEDs comprising a plurality of LEDs adapted to generate a first emission spectrum having a peak between 450-460 nm (royal blue light);

(ii) a second group of LEDs comprising a plurality of LEDS adapted to generate a second emission spectrum having a peak between 630-670 nm (crimson light);

(iii) a third group of LEDs comprising a plurality of LEDs adapted to generate a third emission spectrum having a peak between 720-740 nm (cherry red light);

(iv) a fourth group of LEDs comprising a plurality of LEDs adapted to generate white light;

the intensity of the light output generated by each group of LEDs being adjustable independently of the other groups;

wherein the lighting device further comprises an array of lenses, each lens comprising a light entering section in the form of a blind recess and a light emitting section, the outer surface of the light emitting section being substantially hemispherical and at least part of the internal, light receiving surface of the light entering section incorporating a high density of small convex facets.

22. Light fitting suitable for promoting plant growth, said light fitting comprising:

—

One or more housings;

one or more lighting devices as claimed in claim 21;

a connection to a power supply;

a driver;

a connection to a control module.