LED LIGHTING SYSTEM

• US 20080273330A1
• Filed: 05/04/2007
• Published: 11/06/2008
• Est. Priority Date: 05/04/2007
• Status: Active Grant

• Current Assignee: ABL IP Holding LLC (Acuity Brands, Inc.)
• Original Assignee: ABL IP Holding LLC (Acuity Brands, Inc.)
• Inventors: Tyson, Glenn M.
• Granted Patent: US 7,690,816 B2
• Time in Patent Office: Days
• US Class Current: 362/294
• CPC Class Codes: F21S 8/00 Lighting devices intended for fixed installation F21S9/00, F21S10/00 take precedence; using a string or strip of light sources F21S4/00
• CPC Class Codes: F21V 14/02 by movement of light sources in vehicle head lamps F21S41/657
• CPC Class Codes: F21V 21/30 Pivoted housings or frames
• CPC Class Codes: F21W 2121/02 for fountains
• CPC Class Codes: F21W 2131/401 for swimming pools
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: Y10S 362/80 Light emitting diode

Abstract

A fountain lighting system including a light engine head containing an LED light engine and a control housing containing control gear electronics includes a fixture support providing thermal separation between the light engine head and the control housing. The fixture support includes a lid with a bar extending from the edge thereof. The lid closes the control housing while the bar mounts the light engine head. An anchoring mount is also on the bar. The lid includes receptacles for receiving power, control and light engine cables with wicking barriers separating the various components provided in the lid itself. Temperature sensors in the light engine head and in the control housing send data communication to the control gear electronics to limit power to avoid thermal loading. The control gear electronics modulates the power to prevent apparent cycling. A pool lighting system provides similar features in a niche. A gap open to the niche thermally separates the light engine head from the control housing.

Claims

1. A lighting system comprising

a light engine head including a chamber, a lens assembly closing the chamber and an LED light engine in the chamber and directed toward the lens assembly, the chamber being sealed with the lens assembly closing the chamber;

a control housing including a cavity thermally separate from the chamber, control gear electronics in the cavity and a power supply in the cavity;

a fixture support including a lid closing the cavity of the control housing, a beam rigidly extending from one edge of the lid and having a light engine head attachment location, the cavity being sealed with the lid closing the cavity, the light engine head being mounted to the light engine head attachment location with the control housing displaced from the light engine bead.

2. The lighting system of claim 1, the light engine head further including a mounting yoke pivotally mounted at the light engine head attachment location about a first axis, the chamber being pivotally mounted to the yoke about a second axis lying in a plane normal to the first axis.

3. The lighting system of claim 1, the fixture support including a fixture attachment location between the light engine head attachment location and the lid and open away from the control housing and the light engine head for mounting attachment of the fixture support.

4. The lighting system of claim 1, the control housing further including thermally conductive potting material to dissipate heat from the cavity about the control gear electronics and about the power supply and a heat sick thermally coupled with the control gear electronics.

5. A lighting system comprising

a light engine head including a chamber, a lens assembly closing the chamber and an LED light engine in the chamber directed toward the lens assembly, the chamber being sealed with the lens assembly closing the chamber;

a control housing including a cavity thermally separate from the chamber, control gear electronics in the cavity and a power supply in the cavity;

a lid closing the cavity of the control housing, the lid including first receptacles therein facing the cavity;

a power cable extending to one of the first receptacles through the lid;

potting compound in the first receptacles, the ends of the power cable including bare wire being surrounded by the potting compound in the first receptacles to form wicking barriers.

6. The lighting system of claim 5 further comprising

a control cable extending to one of the first receptacles through the lid, the end of control cable including bare wire being surrounded by the potting compound in the first receptacles to form wicking barriers.

7. The lighting system of claim 5 further comprising

a light engine cable extending from one of the first receptacles to the light engine head through the lid, the ends of the light engine cable also including bare wire being surrounded by the potting compound in the first receptacles to form wicking barriers.

8. The lighting system of claim 5 further comprising

light engine connectors extending from the cavity of the control housing to the light engine head, the control housing further including a second receptacle in the cavity, open toward the lid and receiving the bare wire ends of the light engine connectors in the control housing and potting compound to form wicking barriers for the light engine connectors.

9. The lighting system of claim 8 further comprising

an electro-grid between the LED light engine and the lens assembly, the light engine bead chamber being conductive, the electro-grid being electrically connected to the chamber.

10. A lighting system comprising

a light engine head including a chamber, a lens assembly closing the chamber, an LED light engine in the chamber and directed toward the lens assembly and a thermally conductive plate fixed to the chamber, the LED light engine being mounted to the thermally conductive plate, the chamber being sealed with the lens assembly closing the chamber;

a control housing including a cavity thermally separate from the chamber, control gear electronics in the cavity and a power supply in the cavity;

a first temperature sensor in the chamber, measuring the temperature of the plate at one location and in data communication with the control gear electronics, the control gear electronics being constructed and arranged to reduce power to the LED light engine with the first temperature sensor reaching a predetermined threshold temperature profile, the threshold temperature profile adjusted to compensate for the thermal drop between portions of the LED light engine.

11. The lighting system of claim 10, the control gear electronics further constructed and arranged to measure the rate of change of the data communication representing the temperature of the first temperature sensor and to vary the power input to the light engine bead responsive to the rate of change to avoid visually apparent changes in light intensity.

12. The lighting system of claim 10 further comprising

a second temperature sensor on and in data communication with the control gear electronics, the control gear electronics being constructed and arranged to reduce power to the LED light engine with the second temperature sensor reaching a predetermined threshold temperature profile and to measure the rate of change of the data communication representing the temperature of the first temperature sensor and to vary the power input to the light engine head responsive to the rate of change to avoid visually apparent changes in light intensity.

13. The lighting system of claim 10, the control housing further including thermally conductive potting material to dissipate heat from the cavity about the control gear electronics and about the power supply and a heat sink thermally coupled with the control gear electronics.

14. The lighting system of claim 13, the control gear electronics including a circuit board with field effect transistors, the circuit board being encased in the thermally conductive potting material and the heat sink being adjacent the field effect transistors.

15. The lighting system of claim 14, the control housing being thermally conductive, the thermally conductive potting material and the heat sink being in thermal contact with the control housing.

16. A lighting system comprising

an open, underwater niche;

a light engine head including a chamber, a lens assembly closing the chamber and an LED light engine in the chamber directed toward the lens assembly, the chamber being sealed with the lens assembly closing the chamber;

a control housing including a cavity thermally separate from the chamber, a lid closing the cavity, control gear electronics in the cavity, a power supply in the cavity and thermally conductive material to dissipate heat from the cavity, the light engine head and the control housing being separated by a gap open to the niche with attachments extending there between and stacked in the niche with the lens assembly facing outwardly of the niche, the chamber being between the gap and the lens assembly.

17. The lighting system of claim 18 further comprising

a mounting ring about the lens assembly, extending radially outwardly of the niche and including circulation holes in communication with the niche, the light engine head being mounted to the mounting ring.

18. The lighting system of claim 16 further comprising

a lid closing the cavity of the control housing, the lid including first receptacles therein facing the cavity;

a power cable extending to one of the first receptacles through the lid;

potting compound in the first receptacles, the end of the power cable including bare wire being surrounded by the polling compound in the first receptacles to form wicking barriers;

light engine connectors extending from the cavity of the control housing to the light engine head, the control housing further including a second receptacle in the cavity, open toward the lid and receiving the bare wire ends of the light engine connectors in the control housing and potting compound to form wicking barriers for the light engine connectors;

an electro-grid between the LED light engine and the lens assembly, the light engine head chamber being conductive, the electro-grid being electrically connected to the chamber.

19. The lighting system of claim 18 further comprising

a first temperature sensor in the chamber and in data communication with the control gear electronics, the control gear electronics being constructed and arranged to reduce power with the first temperature sensor reaching a predetermined threshold temperature profile, the light engine bead further including a thermally conductive plate fixed to the chamber, the LED light engine being mounted to the thermally conductive plate, the first temperature sensor measuring the temperature of the plate at one location, the threshold temperature profile adjusted to compensate for the thermal drop between portions of the LED light engine