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Light Emitting Diode (Led) Lighting Systems Including (19) TZZ Z _T (11) EP 2 470 827 B1 (12) EUROPEAN PATENT SPECIFICATION (45) Date of publication and mention (51) Int Cl.: of the grant of the patent: F21V 13/04 (2006.01) F21K 99/00 (2016.01) 07.09.2016 Bulletin 2016/36 F21V 7/00 (2006.01) (21) Application number: 10821018.8 (86) International application number: PCT/US2010/048843 (22) Date of filing: 15.09.2010 (87) International publication number: WO 2011/041097 (07.04.2011 Gazette 2011/14) (54) LIGHT EMITTING DIODE (LED) LIGHTING SYSTEMS INCLUDING LOW ABSORPTION, CONTROLLED REFLECTANCE AND DIFFUSION LAYERS BELEUCHTUNGSSYSTEM MIT LICHTEMITTIERENDEN DIODEN (LEDS) SOWIE MIT GERINGER ABSORPTION, GESTEUERTER REFLEXION UND DIFFUSIONSSCHICHTEN SYSTÈMES D’ÉCLAIRAGE À DIODES ÉLECTROLUMINESCENTES (DEL) COMPRENANT DES COUCHES DE FAIBLE ABSORPTION, DE RÉFLECTANCE CONTRÔLÉE ET DE DIFFUSION (84) Designated Contracting States: (74) Representative: Boult Wade Tennant AL AT BE BG CH CY CZ DE DK EE ES FI FR GB Verulam Gardens GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO 70 Gray’s Inn Road PL PT RO SE SI SK SM TR London WC1X 8BT (GB) (30) Priority: 30.09.2009 US 570571 (56) References cited: 13.07.2010 US 835390 WO-A1-2008/135927 US-A1- 2003 165 060 US-A1- 2005 105 302 US-A1- 2006 237 636 (43) Date of publication of application: US-A1- 2007 284 592 US-A1- 2008 225 553 04.07.2012 Bulletin 2012/27 US-B2- 6 898 012 US-B2- 7 132 136 US-B2- 7 408 709 (73) Proprietor: Cree, Inc. Durham, NC 27703 (US) • ’Cree Announces Volume Availability of Cree LR24 Luminaire.’ FLASHLIGHT NEWS., [Online] (72) Inventors: 2008, XP055093879 Retrieved from the Internet: • NEGLEY, Gerald H. <URL:http://flashlightnews.org/story1865.sh Chapel Hill, North Carolina 27517 (US) tml> [retrieved on 2011-01-03] • VAN DE VEN, Antony P. • ’Furukawa America Debuts MCPET Reflective Sai Kung Sheets to Improve Clarity and Efficiency of N.T. Hong Kong (CN) Lighting Fixtures.’, [Online] 2007, pages 1 - 3, • PICKARD, Paul Kenneth XP008162015 Retrieved from the Internet: Morrisville, North Carolina 27560 (US) <URL:http://www.thefreelibrary.com/Furukawa +America+Debuts+MCPET+Reflective+Sheets +to+Improve+Clarity..: a0163370179> [retrieved on 2011-01-03] Note: Within nine months of the publication of the mention of the grant of the European patent in the European Patent Bulletin, any person may give notice to the European Patent Office of opposition to that patent, in accordance with the Implementing Regulations. Notice of opposition shall not be deemed to have been filed until the opposition fee has been paid. (Art. 99(1) European Patent Convention). EP 2 470 827 B1 Printed by Jouve, 75001 PARIS (FR) 1 EP 2 470 827 B1 2 Description including lightoutput, wattage, color rendering index,cor- related color temperature, dimensions and base. BACKGROUND OF THE INVENTION [0006] A lighting system according to the preamble of claim 1 is disclosed in patent document [0001] This invention relates to lighting systems and, 5 WO2008/135927. more particularly, to lighting systems that use light emit- ting diodes (LEDs). SUMMARY OF THE INVENTION [0002] LEDs are increasingly being used in lighting/il- lumination applications, such as traffic signals, color wall [0007] LED lighting systems in line with claims 1 and wash lighting, backlights, displays and general illumina- 10 11 are provided. According to various embodiments de- tion, with one ultimate goal being a replacement for the scribed herein, these may include at least one LED and ubiquitous incandescent light bulb. In order to provide a an enclosure adjacent the at least one LED, that is con- broad spectrum light source, such as a white light source, figured to that at least some light that is emitted by the from a relatively narrow spectrum light source, such as at least one LED passes through the enclosure. The en- an LED, the relatively narrow spectrum of the LED may 15 closure has a transmittance-to-reflectance ratio that is be shifted and/or spread in wavelength. configured to homogenize light that emerges from the [0003] For example, a white LED may be formed by enclosure (1) directly from the at least one LED, and (2) coating a blue emitting LED with an encapsulant material, after one or more reflections within the enclosure. Ac- such as a resin or silicon, that includes therein a wave- cordingly, the enclosure is configured to control the rel- length conversion material, such as a YAG:Ce phosphor, 20 ative amount of light that is transmitted and reflected, so that emits yellow light in response to stimulation with blue that the light is evenly diffused and the colors inside the light. Some, but not all, of the blue light that is emitted by disclosures are mixed to provide homogenous light that the LED is absorbed by the phosphor, causing the phos- emerges from the enclosure. phor to emit yellow light. The blue light emitted by the [0008] In some embodiments, the enclosure has less LED that is not absorbed by the phosphor combines with 25 than about 10%, and in other embodiments less than the yellow light emitted by the phosphor, to produce light about 4%, total absorption of the light that is emitted by that is perceived as white by an observer. Other combi- the at least one LED. In some embodiments, the enclo- nations also may be used. For example, a red emitting sure comprises a microcellular layer having a mean cell phosphor can be mixed with the yellow phosphor to pro- diameter of less than about 10 mm. In other embodiments, duce light having better color temperature and/or better 30 the enclosure comprises a microporous layer. In some color rendering properties. Alternatively, one or more red embodiments, the enclosure comprises low absorption LEDs may be used to supplement the light emitted by diffusing material such as a layer of microcellular poly- the yellow phosphor-coated blue LED. In other alterna- ethylene terephthalate (MCPET) and/or a layer of Diffuse tives, separate red, green and blue LEDs may be used. Light Reflector (DLR) material. Moreover, infrared (IR) or ultraviolet (UV) LEDs may be 35 [0009] The enclosure has a transmittance-to-reflect- used. Finally, any or all of these combinations may be ance ratio that varies at different locations thereof. In used to produce colors other than white. some embodiments, the microcellular layer of MCPET [0004] LEDs also may be energy efficient, so as to sat- and/or DLR material is of variable thickness at different isfy ENERGY STAR® program requirements. ENERGY locations thereof to provide the transmittance-to-reflect- STAR program requirements for LEDs are defined in40 ance ratio that varies at different locations thereof. Ion "ENERGY STAR® Program Requirements for Solid other embodiments, the microcellular layer of MCPET State Lighting Luminaires, Eligibility Criteria - version and/or DLR material includes a non-uniform array of 1.1", Final: 12/19/08, the disclosure of which is hereby holes extending therethrough to provide the transmit- incorporated herein by reference in its entirety as if set tance-to-reflectance ratio that varies at different locations forth fully herein. 45 thereof. Yet other embodiments can provide a layer of [0005] In order to encourage development and deploy- variable thickness and/or a patterned layer on the layer ment of highly energy efficient solid state lighting (SSL) of MCPET and/or DLR material. In yet other embodi- products to replace several of the most common lighting ments, the enclosure comprises a reflective layer having products currently used in the United States, including an array of holes thereof. 60-watt A19 incandescent and PAR 38 halogen incan- 50 [0010] In still other embodiments, the enclosure com- descent lamps, the Bright Tomorrow Lighting Competi- prises a bulb-shaped enclosure and a screw-type base tion (L Prize™) has been authorised in the Energy Inde- at the base of the bulb-shaped enclosure. The bulb- pendence and Security Act of 2007 (EISA). The L Prize shaped enclosure may have higher transmittance-to-re- is described in "Bright Tomorrow Lighting Competition (L flectance ratio remote from the screw-type base than ad- Prize™)", May 28, 2008, Document No. 08NT006643, 55 jacent the screw-type base. In still other embodiments, the disclosure of which is hereby incorporated herein by the LED lighting system may conform to the ENERGY reference in its entirety as if set forth fully herein. The L STAR Program Requirements for Solid State Lighting Prize winnermust conformto many productrequirements Luminaires. In yet other embodiments, the LED lighting 2 3 EP 2 470 827 B1 4 system may further conform to the product requirements ance ratio that is configured to homogenize intensity of for light output, wattage, color rendering index, correlated the light that emerges through a reflective layer. A diffu- color temperature, dimensions and base type of a 60- sion layer is provided on the reflective layer opposite the watt A19 or a PAR 38 Incandescent Replacement for the plurality of LEDs, so that at least some of the light that L Prize. 5 emerges from the reflective layer Accordingly, at least [0011] Many different embodiments of LEDs may be some of the color non-uniformity that is produced by the provided in LED lighting systems described herein. For reflective layer may be homogenized by the diffusion lay- example, in some embodiments, the at least one LED er. comprises first and second LEDs of different colors. In [0015] In some embodiments, the reflective layer that other embodiments, the at least one LED comprises first 10 has less than about 10% total absorption and in other and second spaced apart LEDs of same color.
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