GB2345954A - Light bulb with a plastic bulb mounting portion and LED light source. - Google Patents

Light bulb with a plastic bulb mounting portion and LED light source. Download PDF

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Publication number
GB2345954A
GB2345954A GB9901098A GB9901098A GB2345954A GB 2345954 A GB2345954 A GB 2345954A GB 9901098 A GB9901098 A GB 9901098A GB 9901098 A GB9901098 A GB 9901098A GB 2345954 A GB2345954 A GB 2345954A
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Prior art keywords
bulb
light
diodes
rti
lt
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB9901098A
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GB2345954B (en )
GB9901098D0 (en )
Inventor
Ian Lennox Crawford
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Ian Lennox Crawford
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Filing date
Publication date

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21KNON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
    • F21K9/00Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
    • F21K9/20Light sources comprising attachment means
    • F21K9/23Retrofit 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
    • F21K9/232Retrofit 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 specially adapted for generating an essentially omnidirectional light distribution, e.g. with a glass bulb
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21YINDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00Light-generating elements of semiconductor light sources
    • F21Y2115/10Light-emitting diodes [LED]

Abstract

A light bulb which uses light emitting diodes 2 encapsulated in a transparent material, which may be clear or coloured; wherein a bulb mounting portion 13 intended to enter the bulb receiving socket is formed from cast or moulded plastic. The same plastics material may be used to both encapsulate the LEDs and form the bulb mounting portion. A base unit 4 has a printed circuit board or hard wiring, to which the LEDs are electrically connected. A reflector may be positioned where the bulb mounting portion merges with the LED containing portion. The bulb has a conventional bulb shape and has electrical contacts 7,8 in the bulb mounting portion in the conventional positions making it suitable to be mounted in a conventional bulb socket.

Description

NON-FILAMENT LIGHTS This invention relates to lights for illumination and/or other purposes such as signalling.

In particular, the present invention is concerned with a construction of a light bulb which is particularly suitable for use at locations where the bulb when in use is subjected to vibration and other forces exerting stresses and strains upon the bulb structure. A common location of usage in which vibrations and other stress conditions are likely to arise is where bulbs are used as motor vehicle lights.

It is very well known that the source of light in existing motor vehicle light bulbs and most other light bulbs is a coiled filament or other filament formation. It is also well known that this filament involves an inherent fault exhibited by the ease by which it fractures, for example, as a result of vibrations from a vehicle to which it is fitted.

It has also been proposed to make use of a form of illumination known as a Light Emitting Diode as a source of illumination for a light bulb.

In view of the relatively small size of the light producing area of an individual Light Emitting Diode it has been proposed to provide an array of Light Emitting Diodes. One such known proposal involves the use of a reflective circuit board upon which a plurality of individual Light Emitting Diodes have been mounted, the board providing an electrical circuit to interconnect the Light Emitting Diodes so that they can be collectively or individually illuminated by a source of energy. In practice, the electrical circuit can comprise a printed circuit board or be hard wired and driven from a source of electical energy.

This known proposal merely produces an assembly having a light production capability related to the number of Light Emitting Diodes incorporated, and bearing in mind that the Light Emitting Diodes are mounted to an extended area baseboard this proposed assembly cannot be regarded as being equivalent in size to that of a conventionally formed bulb with its standard form of metallic sleeve like connection capability to a standard light bulb socket.

It has also been proposed to provide an assembly including one or more Light Emitting Diodes, this proposal being of a rudimentary nature and not capable of providing a reliable replacement for light bulbs as presently used with vehicles.

It has been further proposed to provide an encapsulated arrangement for the light emitting diodes in conjunction with a standard metal plug in part of a conventional bulb.

A particularly important use for vehicle light bulbs is as the rear lights on the vehicle. Since such bulbs are on the rear of the vehicle the user of the vehicle can remain totally unaware that a rear light bulb has become defective.

In addition, since in relation to lorries (and other commercial vehicles) and particularly those utilising some form of trailer, the so-called road running bounce often leads excessive vibration forces being produced which in turn leads to very premature break down of the conventional type of filament bulb.

It is an object of the present invention to provide a light bulb construction which exhibits a much greater resistance to vibrational breakdown as compared with a conventional type of filament bulb.

Broadly, according to a first aspect of the invention there is provided a light bulb which uses as the source of illumination thereof Light Emitting Diodes, and which is of such construction that the illumination producing Light Emitting Diodes are totally encapsulated in light transparent encapsulent, and in which the portion of the bulb that is intended to enter into a bulb receiving socket is formed by a cast or moulded plastics material.

Preferably, the plastics material used to provide the portion of the bulb intended to enter the socket is formed from the same material as that used to encapsulate the Light Emitting Diodes.

Conveniently both the encapsulation of the Light Emitting Diodes and the formation of the portion of the bulb for engaging with a bulb mounting socket are simultaneously formed.

For a better understanding of the invention and to show how to carry the same into effect reference will now be made to the accompanying drawing in which: Figure <RTI>1</RTI> is a schematic sectional side view of a light bulb incorporating the concepts of the invention, and Figures 2,3 and 4 schematically illustrate electrical contact arrangements.

Referring now to Figure <RTI>1</RTI> Light Emitting Diodes <RTI>1</RTI> are grouped to provide an array 2 thereof, with the individual Light Emitting Diodes of the array 2 electrically connected by means of their combine electrical connection and support wires 3 to a base unit 4 which can comprise a printed circuit board or hard wired type of board whereby the diodes <RTI>1</RTI> are electrically connected into a required operational formation.

Thus, for example, the diodes <RTI>1</RTI> can be so connected that whenever the bulb is energised all of the diodes <RTI>1</RTI> are energised or alternatively the diodes <RTI>1</RTI> can be so interconnected as to provide for the possiblility of either selecting all of the diodes or some of the diodes are energised. In other words providing a bulb with the equivalent capability of a two filament bulb construction.

In general, the diodes <RTI>1</RTI> would be connected in parallel as a single group or in two groups of parallel connected diodes.

As shown in the Figure <RTI>1</RTI> the diodes <RTI>1</RTI> are so mounted to the base unit 4 as to be of a generally convex formation.

If desired, the mounting of the diodes could be such as to produce a concave or flat formation (not shown).

The base unit 4 is electically connected by connection wires 5 and 6 to contact providing elements 7 and 8 which are so positioned that when the bulb is mounted to a conventional bulb socket (not shown) the contact elements 7 and 8 of the bulb electrically connect with the relevent positive and negative contacts/terminals of the associated socket.

The array of light emitting diodes <RTI>1</RTI> can be conveniently regarded as a group of light Emitting Diodes arranged in a flat or slightly convex array of, for example, 6x6,7x7, or other configurations of diodes. In practice, the number of diodes used will depend upon the output of the individual diodes and the size of the illuminatable portion required for the bulb. Thus, the number of diodes forming the array will be as thought suitable for an intended application and/or light putput.

As discussed it will be noted that the light bulb of the invention can be regarded as including two main portions a first portion 9 which contains the array of Light Emitting Diodes <RTI>1</RTI> and any associated electrical circuitry and a second portion <RTI>10</RTI> which forms the bulb mounting portion and which is intended to provide a conventionally shaped and dimensioned cylindrical formation <RTI>11</RTI> which is intended to engage with a conventional socket for the bulb.

The first portion 9 essentially incorporates a plastics body 12 that totally encapsulates the diode array and the base unit 5.

The cylindrical formation <RTI>11</RTI> provides the connecter part of the bulb and also serves as the housing for the electrical connections <RTI>5</RTI> an 6, and is formed of a plastics material. This plastics material fully encapsulates the connection wires 5 and 6 and positionally sets the connection areas 7 an 8 in the required positions with respect to the cylindrical formation 11. These two bulb portions 9 and <RTI>10</RTI> are integrally connected and as will be noted from the Figure <RTI>1</RTI> they smoothly merge one into the other.

In practice, depending upon the size of the bulb the contact area 7 providing the positive terminal for the bulb can located at the free end 13 of the bulb second portion <RTI>10</RTI> so as to be able to communicate with the associated positive contact of the socket (not shown) whilst the other terminal 8 that is to serve as the negative or earthing terminal can comprise an electrically conductive strip like region 14 provided upon the cylindrical wall of this bulb second portion and held in place by being integrally incorporated into the plastics material of the second portion.

It will be understood that for some bulb constructions it may be required to locate the contact area also in the free end of the second portion.

As is well known bulbs can either be screw threaded for use with a screw threaded socket or bayonet fitting.

In the case of screw fitting the second portion will be appropriately threaded and in the case of bayonet fitting the metal element providing the earth/negative electrical contact can additonally provide the bayonet fitting pins 15. This arrangement is shown the Figure.

In other words, where a bayonet fitting is required conventionally dimensioned bayonet fitting pins 15 are moulded into the plastics material forming the bulb in such manner as to project diametrically opposite one to the other from the bulb mounting portion <RTI>10</RTI> to be able mechanically to engage with the bayonet slots of the socket.

It is convenient to note that, if desired, these bayonet fitting pins can serve as the negative/earth contacts for the bulb.

From the forgoing it will be appreciated that the array 2 of the Light Emitting Diodes is totally encapsulated by overall structure of the bulb.

In practice, the external surface of the portion of the bulb containing the diode array can be of any convenient shape. Preferably, the shape of this external surface is selected to give the best light refraction as is considered appropriate to suit the intended application requirements both physical in terms of shape and size and visual in terms of light intensity and spread. Thus the precise visual form of the bulb can depart from that effectively historically determined by the use of a wire filament.

The encapsulating material from which the bulb is made can be of a wholly transparant material or alternatively of any colour considered suitable for any particular application of the bulb and light diffusion.

It should be noted that in the vicinity of the array of diodes the plastics material being used to encapsulate the array has the functions of allowing as much light as possible from the Light Emitting Diodes to pass through the material, to act as a lens for focussing the light and to provide physical protection against damage to the Light Emitting Diodes encapsulated thereby.

If considered convenient, the region at which the two portions merge can be such as to provide for a reflective capability for the light emitted by the diodes <RTI>1.</RTI>

It will be understood that the plastics material used for the bulb construction has to be of such physical strength as to take the place of the conventionally used brass cylindrical sleeve-like housing used in the construction of conventional bulbs.

It has been found that a light bulb incorporating the concepts of the present invention can be withstand without operational breakdown considerable amount of physical abuse far in excess of that can be accommodated by a conventional filament bulb.

In practice, the specific arrangement of the Light Emitting Diodes will be related to the specific size and shaping of the Light Emitting Diodes themselves and the intended applications of the bulbs.

It will be appreciated that with the object of achieving as high a light output as possible the Light Emitting Diodes used would be those affording the highest light output in terms of volume and intensity and suiting a particular application of the bulb.

In practice, the overall number of Light Emitting Diodes used in a bulb according to the invention is limited only by the physical size and application requirements for the bulb. It is to be noted however, that the bulb of the invention can be operated from almost any supply voltage (a. c. or d. c.) once such supply voltage has been set at the output side of the associated electrical circuitry (not shown) to voltage and current levels appropriate for use with the array. It will be understood that the purpose and characteristics of the control circuit would depend upon the application and any associated electrical requirements for the bulb.

It will be appreciated that for the purposes of manufacture the electrical components of the bulb could be preassembled and the composite assembly totally encapsulated to provide an integral formation for the light emitting portion and the bulb connection portion.

Figures 2,3 and 4 very schematically illustrates various ones of such contact assemblies.

Claims (17)

  1. CLAIMS <RTI>1.</RTI> A light bulb which uses as the source of illumination thereof Light Emitting Diodes,. and which is of such construction that the illumination producing Light Emitting Diodes are totally encapsulated in light transparent encapsulent, and in which the portion of the bulb that is intended to enter into a bulb receiving socket is formed by a cast or moulded plastics material.
  2. 2. A light bulb as claimed in claim <RTI>1,</RTI> and wherein the plastics material used to provide the portion of the bulb intended to enter the socket is formed from the same material as that used to encapsulate the Light Emitting Diodes.
  3. 3. A light bulb as claimed in claim <RTI>1</RTI> or 2, and wherein both the encapsulation of the Light Emitting Diodes and the formation of the portion of the bulb for engaging with a bulb mounting socket are simultaneously formed.
  4. 4. A light bulb as claimed in claim <RTI>1,</RTI> 2, or 3, and wherein a plurality of Light Emitting Diodes are grouped to provide an array thereof in which the individual Light Emitting Diodes are electrically connected by means of their combined electical connection and support wires to a base unit.
  5. 5. A light buld as claimed in claim 4, wherein the base unit comprises a printed circuit board or hard wired type of board whereby the diodes are electrically connected into a required operational formation.
  6. 6. A light bulb s claimed in claim 5, and wherein the diodes are so connected that on energisation of the bulb all of the diodes are energised or alternatively the diodes are so interconnected as to provide for the possiblility of upon energisation of the bulb either all of the diodes or some of the diodes can be energised.
  7. 7. A light bulb as claimed in claim 5 or 6, and wherein the diodes are so mounted to the base unit as to be of a generally convex, concave or flat formation.
  8. 8. A light bulb as claimed in claims 4,6, or 6, and wherein the base unit 4 is electically connected by connection wires to contact providing elements which are so positioned that when the bulb is mounted to a conventional bulb socket the contact elements of the bulb electrically connect with the relevent positive and negative contacts/terminals of the associated socket.
  9. 9. A light bulb as claimed in any one of the preceding claims 4 to 8, and wherein the light bulb includes a first portion which contains the array of Light Emitting Diodes and any associated electrical circuitry and a second portion which forms a bulb mounting portion and which is intended to provide a conventionally shaped and dimensioned cylindrical formation which is intended to engage with a conventional socket for the bulb.
  10. 10. A light bulb as claimed in claim 9, and wherein the first portion essentially incorporates a plastics body that totally encapsulates the diode array and the base unit.
  11. 11. A light bulb as claimed in claim 9 or 10, and wherein second portion is cylindrical and provides the connecter part of the bulb and also serves as the housing for the electrical connections, said portion being formed of a plastics material which is arranged fully to encapsulate the connection wires and positionally to set the contact connection areas in a required position with respect to the cylindrical formation.
  12. 12. A light buld as claimed in claim 9,10 or 11, and wherein the first and second bulb portions are integrally connected and smoothly merge one into the other.
  13. 13. A light bulb as claimed in claim 12, and wherein the region at which the two portions merge can be such as to provide for a reflective capability for the light emitted by the diodes.
  14. 14. A light bulb as claimed in claim 12 or 13, and wherein depending upon the size of the bulb the contact area for providing the positive terminal for the bulb can located at the free end of the bulb second portion so as to be able to communicate with the associated positive contact of a conventional socket whilst the other terminal that is to serve as the negative or earthing terminal for the bulb includes an electrically conductive strip like region provided upon the cylindrical wall of the second portion said strip like region being and held in place by being integally incorporated into the plastics material of the second portion.
  15. 15. A light bulb as claimed in any one of the preceding claims, and wherein the encapsulating material from which the bulb is made can be a wholly transparant/clear material or alternatively of any colour considered suitable for any particular application of the bulb and light diffusion.
  16. 16. A light bulb as claimed in any one of the preceding claims, and wherein in the vicinity of the array of diodes the plastics material being used to encapsulating the array has functions of the allowing as much light as possible from the Light Emitting Diodes to pass through the material, to act as a lens for focussing the light and to provide physical protection against damage to the Light Emitting Diodes encapsulated thereby.
  17. 17. A light bulb constructed and arranged to operate substantially as hereinbefore described with reference to Figure 1,2,3 or 4 of the accompanying drawings.
GB9901098A 1999-01-20 1999-01-20 Non-filament lights Expired - Fee Related GB2345954B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9901098A GB2345954B (en) 1999-01-20 1999-01-20 Non-filament lights

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9901098A GB2345954B (en) 1999-01-20 1999-01-20 Non-filament lights

Publications (3)

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GB9901098D0 GB9901098D0 (en) 1999-03-10
GB2345954A true true GB2345954A (en) 2000-07-26
GB2345954B GB2345954B (en) 2003-03-19

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GB2384850A (en) * 2002-02-01 2003-08-06 Authentics Ltd LED lamp with removable illumination module
WO2005109534A2 (en) * 2004-04-30 2005-11-17 Lighting Science Group Corporation Light bulb having wide angle light dispersion and method of making same
GB2417128A (en) * 2004-08-13 2006-02-15 Tsu-Kang Chang White light bulb assembly using LEDs as a light source
US7824065B2 (en) 2004-03-18 2010-11-02 Lighting Science Group Corporation System and method for providing multi-functional lighting using high-efficiency lighting elements in an environment
US8004203B2 (en) 2004-04-23 2011-08-23 Lighting Science Group Corporation Electronic light generating element with power circuit
US8487518B2 (en) 2010-12-06 2013-07-16 3M Innovative Properties Company Solid state light with optical guide and integrated thermal guide
US8591062B2 (en) 2012-04-13 2013-11-26 Cree, Inc. LED lamp
US8596825B2 (en) 2009-08-04 2013-12-03 3M Innovative Properties Company Solid state light with optical guide and integrated thermal guide
US8752983B2 (en) 2012-04-13 2014-06-17 Cree, Inc. Gas cooled LED lamp
US8882284B2 (en) 2010-03-03 2014-11-11 Cree, Inc. LED lamp or bulb with remote phosphor and diffuser configuration with enhanced scattering properties
US8931933B2 (en) 2010-03-03 2015-01-13 Cree, Inc. LED lamp with active cooling element
US9022601B2 (en) 2012-04-09 2015-05-05 Cree, Inc. Optical element including texturing to control beam width and color mixing
US9024517B2 (en) 2010-03-03 2015-05-05 Cree, Inc. LED lamp with remote phosphor and diffuser configuration utilizing red emitters
US9052067B2 (en) 2010-12-22 2015-06-09 Cree, Inc. LED lamp with high color rendering index
US9052093B2 (en) 2013-03-14 2015-06-09 Cree, Inc. LED lamp and heat sink
US9057511B2 (en) 2010-03-03 2015-06-16 Cree, Inc. High efficiency solid state lamp and bulb
US9062830B2 (en) 2010-03-03 2015-06-23 Cree, Inc. High efficiency solid state lamp and bulb
US9062867B2 (en) 2012-12-12 2015-06-23 Cree, Inc. LED lamp
US9068701B2 (en) 2012-01-26 2015-06-30 Cree, Inc. Lamp structure with remote LED light source
US9097396B2 (en) 2012-09-04 2015-08-04 Cree, Inc. LED based lighting system
US9097393B2 (en) 2012-08-31 2015-08-04 Cree, Inc. LED based lamp assembly
US9115870B2 (en) 2013-03-14 2015-08-25 Cree, Inc. LED lamp and hybrid reflector
US9134006B2 (en) 2012-10-22 2015-09-15 Cree, Inc. Beam shaping lens and LED lighting system using same
US9157602B2 (en) 2010-05-10 2015-10-13 Cree, Inc. Optical element for a light source and lighting system using same
US9217544B2 (en) 2010-03-03 2015-12-22 Cree, Inc. LED based pedestal-type lighting structure
US9234655B2 (en) 2011-02-07 2016-01-12 Cree, Inc. Lamp with remote LED light source and heat dissipating elements
US9234638B2 (en) 2012-04-13 2016-01-12 Cree, Inc. LED lamp with thermally conductive enclosure
US9243777B2 (en) 2013-03-15 2016-01-26 Cree, Inc. Rare earth optical elements for LED lamp
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US9273835B2 (en) 2010-12-08 2016-03-01 Cree, Inc. Linear LED lamp
US9275979B2 (en) 2010-03-03 2016-03-01 Cree, Inc. Enhanced color rendering index emitter through phosphor separation
US9279543B2 (en) 2010-10-08 2016-03-08 Cree, Inc. LED package mount
US9285082B2 (en) 2013-03-28 2016-03-15 Cree, Inc. LED lamp with LED board heat sink
US9303857B2 (en) 2013-02-04 2016-04-05 Cree, Inc. LED lamp with omnidirectional light distribution
US9310028B2 (en) 2012-04-13 2016-04-12 Cree, Inc. LED lamp with LEDs having a longitudinally directed emission profile
US9310065B2 (en) 2012-04-13 2016-04-12 Cree, Inc. Gas cooled LED lamp
US9310030B2 (en) 2010-03-03 2016-04-12 Cree, Inc. Non-uniform diffuser to scatter light into uniform emission pattern
US9316361B2 (en) 2010-03-03 2016-04-19 Cree, Inc. LED lamp with remote phosphor and diffuser configuration
US9322543B2 (en) 2012-04-13 2016-04-26 Cree, Inc. Gas cooled LED lamp with heat conductive submount
US9360188B2 (en) 2014-02-20 2016-06-07 Cree, Inc. Remote phosphor element filled with transparent material and method for forming multisection optical elements
US9395051B2 (en) 2012-04-13 2016-07-19 Cree, Inc. Gas cooled LED lamp
US9395074B2 (en) 2012-04-13 2016-07-19 Cree, Inc. LED lamp with LED assembly on a heat sink tower
US9412926B2 (en) 2005-06-10 2016-08-09 Cree, Inc. High power solid-state lamp
US9423116B2 (en) 2013-12-11 2016-08-23 Cree, Inc. LED lamp and modular lighting system
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US9435492B2 (en) 2013-03-15 2016-09-06 Cree, Inc. LED luminaire with improved thermal management and novel LED interconnecting architecture
US9462651B2 (en) 2014-03-24 2016-10-04 Cree, Inc. Three-way solid-state light bulb
US9470882B2 (en) 2011-04-25 2016-10-18 Cree, Inc. Optical arrangement for a solid-state lamp
US9482421B2 (en) 2011-12-30 2016-11-01 Cree, Inc. Lamp with LED array and thermal coupling medium
US9488767B2 (en) 2014-08-05 2016-11-08 Cree, Inc. LED based lighting system
US9488322B2 (en) 2014-04-23 2016-11-08 Cree, Inc. LED lamp with LED board heat sink
US9488359B2 (en) 2012-03-26 2016-11-08 Cree, Inc. Passive phase change radiators for LED lamps and fixtures
US9500325B2 (en) 2010-03-03 2016-11-22 Cree, Inc. LED lamp incorporating remote phosphor with heat dissipation features
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US9759387B2 (en) 2014-03-04 2017-09-12 Cree, Inc. Dual optical interface LED lamp
US9797589B2 (en) 2011-05-09 2017-10-24 Cree, Inc. High efficiency LED lamp
US9890940B2 (en) 2015-05-29 2018-02-13 Cree, Inc. LED board with peripheral thermal contact
US9909723B2 (en) 2015-07-30 2018-03-06 Cree, Inc. Small form-factor LED lamp with color-controlled dimming
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2384850B (en) * 2002-02-01 2004-10-27 Authentics Ltd Lamp
GB2384850A (en) * 2002-02-01 2003-08-06 Authentics Ltd LED lamp with removable illumination module
US7824065B2 (en) 2004-03-18 2010-11-02 Lighting Science Group Corporation System and method for providing multi-functional lighting using high-efficiency lighting elements in an environment
US8004203B2 (en) 2004-04-23 2011-08-23 Lighting Science Group Corporation Electronic light generating element with power circuit
WO2005109534A2 (en) * 2004-04-30 2005-11-17 Lighting Science Group Corporation Light bulb having wide angle light dispersion and method of making same
WO2005109534A3 (en) * 2004-04-30 2006-11-02 Lighting Science Group Corp Light bulb having wide angle light dispersion and method of making same
GB2417128A (en) * 2004-08-13 2006-02-15 Tsu-Kang Chang White light bulb assembly using LEDs as a light source
US9412926B2 (en) 2005-06-10 2016-08-09 Cree, Inc. High power solid-state lamp
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