Light emitting diode (LED) lighting fixture

• US 8,933,631 B2
• Filed: 07/02/2012
• Issued: 01/13/2015
• Est. Priority Date: 07/04/2011
• Status: Expired due to Fees

• Current Assignee: Metrolight Ltd.
• Original Assignee: Metrolight Ltd.
• Inventors: Hollander, Jonathan
• Primary Examiner(s): Le, Tung X
• Application Number:
  US13/539,737
• Publication Number:
  US 20130009546A1
• Time in Patent Office: 925 Days
• Field of Search: 315/113, 315/186, 315/192, 315/193, 315/294, 315/297, 315/312, 362/249, 362/294
• US Class Current: 315/113
• CPC Class Codes: F21K 9/238 Arrangement or mounting of circuit elements integrated in the light source
• CPC Class Codes: F21V 23/005 the substrate is supporting also the light source
• CPC Class Codes: F21V 29/70 characterised by passive heat-dissipating elements, e.g. heat-sinks
• CPC Class Codes: F21Y 2105/18 annular; polygonal other than square or rectangular, e.g. for spotlights or for generating an axially symmetrical light beam
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H05B 45/00 Circuit arrangements for operating light-emitting diodes [LED]
• CPC Class Codes: H05B 45/20 Controlling the colour of the light
• CPC Class Codes: H05B 45/357 specially adapted for retrofit LED light sources
• CPC Class Codes: H05B 45/37 Converter circuits
• CPC Class Codes: H05B 45/395 Linear regulators
• CPC Class Codes: H05B 45/46 having LEDs disposed in parallel lines
• CPC Class Codes: Y02B 20/30 Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Abstract

A high power lighting fixture which includes a first multiple of first light emitting diodes (LEDs) mounted and series connected to form a first serial string of LEDs on a first circuit board. A second multiple of second light emitting diodes (LEDs) mounted and series connected to form a second serial string of LEDs on a second circuit board. Mating circuit board connectors are mounted on the first and second circuit boards. The first and second LEDs, the number of first and second LEDs and the current supplied when operating the first and second LEDs are selected so that the lighting fixture is operable at a minimum electrical power rating of 100 Watts. A control signal is received which determines current division between the first and second LEDs.

Claims

1. A high power lighting fixture comprising:

a first plurality of first light emitting diodes (LEDs) mounted and series connected to form a first serial string of LEDs on a first circuit board;

a second plurality of second light emitting diodes (LEDs) mounted and series connected to form a second serial string of LEDs on a second circuit board;

wherein said first LEDs and said second LEDs have different spectral emission characteristics;

mating circuit board connectors mounted on said first and said second circuit boards wherein said mating circuit board connectors are adapted to connect said first and second serial strings in parallel; and

at least one device mounted on at least one of the circuit boards, wherein the device is adapted to receive a control signal, wherein based on the control signal said device determines current division between the first and second LEDs, wherein the first and second LEDs, the number of first and second LEDs and the current supplied when operating the first and second LEDs are selected so that the lighting fixture is operable at a minimum electrical power rating of 100 Watts.

2. The high power lighting fixture according to claim 1, wherein said control signal determines the color characteristics of the light emitted from at least one of the pluralities of the first and second LEDs.

3. The high power lighting fixture according to claim 1, wherein said first LEDs and second LEDs are supplied by a single power supply.

4. The high power lighting fixture according to claim 1, wherein said first LEDs and second LEDs are adapted to be supplied by an electronic HID ballast configured to provide said control signal.

5. The high power lighting fixture according to claim 1, wherein the first and second LEDs, the number of first and second LEDs and the current supplied when operating the first and second LEDs are selected so that the lighting fixture is operable at a minimum electrical power rating of 150 Watts.

6. The high power lighting fixture according to claim 1, wherein the first and second LEDs, the number of first and second LEDs and the current supplied when operating the first and second LEDs are selected so that the lighting fixture is operable at a minimum electrical power rating of 200 Watts.

7. The high power lighting fixture according to claim 1, further comprising:

a power terminal configured to connect to the circuit boards and supply current therethrough to the LEDs.

8. The high power lighting fixture according to claim 1, wherein said first and second circuit boards are shaped as sectors of a circle with a radius substantially equal to the radius of a lateral cross section of an anterior portion of a reflector of a high intensity discharge lamp.

9. The high power lighting fixture according to claim 1, further comprising:

a heat-transfer-plate mountable in thermal contact with the back ground plane surface of the circuit boards.

10. The high power lighting fixture according to claim 9, further comprising:

a hollow shell open at the anterior and substantial closed at the posterior of the shell, wherein said shell is in thermal contact with said heat-transfer-plate mountable at the anterior of said shell and wherein said shell is configured to dissipate heat through the heat-transfer-plate heat generated when the first and second LEDs are operating.

11. A method for controlling color characteristics of light emitted from a high power lighting fixture, the high power lighting fixture including a first plurality of first light emitting diodes (LEDs) mounted and series connected to form a first serial string of LEDs on a first circuit board and a second plurality of second light emitting diodes (LEDs) mounted and series connected to form a second serial string of LEDs on a second circuit board, wherein the first LEDs and second LEDs have different spectral emission characteristics, the method including the steps of:

enabling mating of respective circuit board connectors mounted on said first and second circuit boards thereby connecting said first and second serial strings in parallel;

enabling controlling current through at least one of said first and second serial strings to achieve a desired color emission from the lighting fixture; and

selecting the first and second LEDs, the number of first and second LEDs and the current supplied when operating the first and second LEDs so that the lighting fixture is operable at a minimum electrical power rating of 100 Watts.

12. The method according to claim 11, further comprising the step of:

wherein said controlling current is performed by supplying current to the light fixture and dividing said current between the first and second serial strings based on a control signal.

13. The method according to claim 11, further comprising:

enabling supplying power to said first LEDs and second LEDs by an electronic HID ballast; and

enabling providing a control signal from said HID ballast to perform said controlling current.