EP2101106A1 - LED road lamp - Google Patents

LED road lamp Download PDF

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Publication number
EP2101106A1
EP2101106A1 EP08004618A EP08004618A EP2101106A1 EP 2101106 A1 EP2101106 A1 EP 2101106A1 EP 08004618 A EP08004618 A EP 08004618A EP 08004618 A EP08004618 A EP 08004618A EP 2101106 A1 EP2101106 A1 EP 2101106A1
Authority
EP
European Patent Office
Prior art keywords
led
road lamp
heat
lamp
green
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.)
Withdrawn
Application number
EP08004618A
Other languages
German (de)
French (fr)
Inventor
Yeh-Chin Chao
Hongqiu Deng
Lianshan Li
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
MarsLEDs Optoelectronics Co Ltd
Original Assignee
MarsLEDs Optoelectronics Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by MarsLEDs Optoelectronics Co Ltd filed Critical MarsLEDs Optoelectronics Co Ltd
Priority to EP08004618A priority Critical patent/EP2101106A1/en
Publication of EP2101106A1 publication Critical patent/EP2101106A1/en
Withdrawn legal-status Critical Current

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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21SNON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S8/00Lighting devices intended for fixed installation
    • F21S8/08Lighting devices intended for fixed installation with a standard
    • F21S8/085Lighting devices intended for fixed installation with a standard of high-built type, e.g. street light
    • F21S8/086Lighting devices intended for fixed installation with a standard of high-built type, e.g. street light with lighting device attached sideways of the standard, e.g. for roads and highways
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21SNON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S8/00Lighting devices intended for fixed installation
    • F21S8/04Lighting devices intended for fixed installation intended only for mounting on a ceiling or the like overhead structures
    • F21S8/06Lighting devices intended for fixed installation intended only for mounting on a ceiling or the like overhead structures by suspension
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21VFUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V29/00Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21WINDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2131/00Use or application of lighting devices or systems not provided for in codes F21W2102/00-F21W2121/00
    • F21W2131/10Outdoor lighting
    • F21W2131/103Outdoor lighting of streets or roads
    • 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

The invention provides a white-light LED road lamp composed of red, green, and blue LED's. The road lamp includes a road lamp body 1, a heat-dissipating element 2, a constant-current source 3, and an LED board 4. The road lamp body 1 is suspended at a specific height above the ground. Inside the road lamp body 1 is disposed with the LED board 4 connected with the heat-dissipating element 2. The side surface of the LED board 4 opposite to the heat-dissipating element 2 is electrically connected with a plurality of red, green, and blue LED's 41. The LED's 41 are connected in series or parallel and driven by the constant-current source 3.

Description

    BACKGROUND OF THE INVENTION Field of Invention
  • The invention relates to a road lamp and, in particular, to a white-light LED lamp composed of red, green, and blue LED's.
  • Related Art
  • Road construction speed and quality grow rapidly with the development of modernized metropolitans. To ensure the security in traffic at night, road lamps are often provided on both sides of roads. Due to tremendous progress in semiconductor technology, current LED illumination has the ability to replace traditional illumination devices. Using LED for illumination has the advantages of high stability, no flashing, more colors, good color quality, and ease in controls. As the LED is a point light source, its illumination orientation can be readily adjusted. Therefore, using a light source with a specific lighting orientation for illumination can make better use of the optical energy emitted thereby. A smaller power is needed to achieve iocai-area illumination than the prior art. Therefore, a lot of energy can be saved.
  • Currently, most road lamps use high-pressure sodium light, various kinds of fluorescent lamps, or incandescent lamps. Their light-emitting efficiencies are only about 30%. The rest of electrical energy is converted into waste heat. Therefore, there is a higher demand for using the LED's in road lamps to save energy. The LED lamp has the features of high light-emitting efficiency, low power consumption, quick reaction speed, long lifetime, high security, and environment-friendly. They thus have a great potential to become substitute illumination devices on the market.
  • However, current LED lamps all use white-light LED as the light sources. To satisfy the need of high luminosity, they generally use high-power white-light LED (1 W or 2 W) as the light sources. The light-emitting principle of white-light LED's is to use a blue-light chip with fluorescent powders thereon. The brightness of blue-light chips is comparatively lower than LED chips of other colors. Moreover, the fluorescent powders have a large attenuation. Therefore, the white-light LED has a larger attenuation in brightness as well. As a result, the heat generated by such a high-power LED is more than ordinary LED's.
  • SUMMARY OF THE INVENTION
  • In view of the foregoing, it is an objective of the invention to provide a white-light LED road lamp composed of red, green, and blue LED's. By using high-luminosity red, green, and blue LED's to synthesize white or warm white light, the lifetime of the invention is longer than the high-power white-light LED's. As the red, green, and blue LED's have better light-emitting efficiencies, the brightness provided by the invention is 1.5 to 3 times better than the white-light LED's under the same power and other conditions. This invention thus effectively solves the problem of large attenuation and heat production in the white-light LED's. It has a good energy-saving effect and longer lifetime. Moreover, the invention provides more colors because it uses the red, green, and blue LED's as the components of its light source.
  • To achieve the above-mentioned objective, the invention includes a road lamp body, a heat-dissipating element, a constant-current source, and an LED board.
  • The road lamp body is suspended at a specific height above the ground. The bottom of the road lamp body is provided with the constant-current source to provide a stable electrical current. A feature of the invention is that the LED board connected with the heat-dissipating element is disposed inside the road lamp body opposite to its opening. One side surface of the LED board opposite to the heat-dissipating element is electrically connected with a plurality of red, green, and blue LED's. Each of the red, green, and blue LED's is connected in parallel to in series and driven by the constant-current source.
  • BRIEF DESCRIPTION OF THE DRAWINGS
    • FIG. 1 is a schematic three-dimensional view of the invention; and
    • FIG. 2 is a schematic view showing the structure in a planar cross section of the invention.
    DETAILED DESCRIPTION OF THE INVENTION
  • The present invention will be apparent from the following detailed description, which proceeds with reference to the accompanying drawings, wherein the same references relate to the same elements.
  • The preferred embodiment of the invention provides a white-light road lamp composed of red, green, and blue LED's. The road lamp includes a road lamp body 1, a heat-dissipating element 2, a constant-current source 3, and an LED board 4.
  • The road lamp body 1 is suspended at a specific height above the ground. The bottom of the road lamp body 1 facing the road has an opening 111. The heat-dissipating element 2 is disposed in the road lamp body 1, corresponding to the opening 111. The constant-current source 3 is disposed in the road lamp body 1 to provide a stable electrical current. A feature of the invention is that the LED board 4 connected with the heat-dissipating element 2 is disposed inside the road lamp body 1, opposite to its opening 111. One side surface of the LED board 4 opposite to the heat-dissipating element 2 is electrically connected with a plurality of red, green, and blue LED's 41. Each of the red, green, and blue LED's 41 is connected in parallel to in series and driven by the constant-current source 3.
  • In this embodiment, the road lamp body 1 further has a lamp shell 11 and a lamp shade 12. The lamp shell 11 is suspended at a specific height above the ground by a lamp post 7. The bottom of the lamp shell 11 corresponding to the road is formed with the opening 111. The constant-current source 3 and the LED board 4 are disposed in the lamp shell 11. The LED's 41 on the LED board 4 correspond to the opening 111. The heat-dissipating element 2 is disposed on the outer side of the lamp shell 11 and corresponding to the LED board 4. On the side surface of the LED board 4 opposite to the LED's 41 is covered with ointment-like heat-conductive silicon resin and soft heat-conductive silicon film 5 connecting to the heat-dissipating element 2. Each of the LED's 41 is electrically connected with the LED board 4 by soldering. A lamp shade 12 is disposed above the heat-dissipating element 2. A piece of sand-blasted glass 6 is disposed at the opening 111 of the lamp shell 11.
  • The red, green, and blue LED's on the LED board 4 are evenly distributed. The red LED emits light of wavelength between 610 nm and 640 nm. The green LED emits light of wavelength between 510 nm and 540 nm. The blue LED emits light of wavelength between 450 nm and 480 nm. According to the wavelengths and currents of the LED's with different colors, the brightness of them is adjusted to produce white or warm white light. The ratio of individual colors fall in the range 2∼4 : 5∼7 : 0.5∼2. In a preferred embodiment, the brightness ratio among the red, green, and blue light is 3 : 6 : 1.
  • All the LED's are driven by the constant-current source. Therefore, they provide homogeneous illumination without flashing, as required. Their lifetime is longer than the LED's in the conventional LED road lamp. For the illumination of roads, the disclosed LED is equipped with a lens that has an elliptical light-emitting surface so as to produce an elliptical light shape. For such an LED light source of power 80 W, its central luminosity at 10 meters away is greater than 42 Lux. The light covers an elliptical area, very suitable for road illumination.
  • Since the LED board is connected with the heat-dissipating element via the ointment-like heat-conductive silicon resin and the soft heat-conductive silicon film, the heat produced by the LED's can be easily removed. The sand-blasted glass is utilized to perform a second color mixing, so that the homogeneity of emitted light is better.
  • Although the invention has been described with reference to specific embodiments, this description is not meant to be construed in a limiting sense. Various modifications of the disclosed embodiments, as well as alternative embodiments, will be apparent to persons skilled in the art. It is, therefore, contemplated that the appended claims will cover all modifications that fall within the true scope of the invention.

Claims (8)

  1. A light-emitting diode (LED) road lamp that synthesizes white light using red, green, and blue LED's, the road lamp comprising:
    a road lamp body (1), which is suspended at a specific height above the ground and has an opening (111) formed at the bottom thereof corresponding to the road;
    a heat-dissipating element (2), which is disposed in the road lamp body (1) corresponding to the opening (111);
    a constant-current source (3), which s disposed in the road lamp body (1) to provide a stable electrical current; and an LED board (4),
    characterized in that the LED board (4) is disposed opposite to the opening (111) and connected with the heat-dissipating element (2), the LED board (4) is electrically connected with a plurality of red, green, and blue LED's (41) on the side opposite to the heat-dissipating element (2), and the red, green, and blue LED's (41) are connected in series or parallel and driven by the constant-current source (3).
  2. The LED road lamp of claim 1, wherein the red, green, and blue LED's (41) are evenly distributed on the LED board (4).
  3. The LED road lamp of claim 1, wherein the red LED (41) emits light of wavelength between 610 nm and 640 nm, the green LED (41) emits light of wavelength between 510 nm and 540 nm, and the blue LED (41) emits light of wavelength between 450 nm and 480 nm.
  4. The LED road lamp of claim 1, wherein the ratio in the brightness of the red, green, and blue LED's (41) on the LED board (4) falls in the range 2∼4 : 5∼7 : 0.5∼2.
  5. The LED road lamp of claim 1, wherein the illuminated light shape of the red, green, and blue LED's is elliptical.
  6. The LED road lamp of claim 1, wherein the road lamp body (1) further includes a lamp shell (11) and a lamp shade (12); wherein the lamp shell (11) is suspended by a lamp post (7) at a specific height above the ground, the opening (111) is formed at the bottom of the lamp shell (11) corresponding to the road, the constant-current source (3) and the LED board (4) are disposed in the lamp shell (11) in a way such that the LED's (41) correspond to the opening (111), and the heat-dissipating element (2) is disposed on the outer side of the lamp shell (11) corresponding to the LED board (4).
  7. The LED road lamp of claim 6, wherein the side of the LED board (4) opposite to the LED's (41) is covered with ointment-like heat-conductive silicon resin and a soft heat-conductive silicon film (5) connected with the heat-dissipating element (2).
  8. The LED road lamp of claim 6, wherein a piece of sand-blasted glass (6) is disposed at the opening (111) of the lamp shell (11).
EP08004618A 2008-03-12 2008-03-12 LED road lamp Withdrawn EP2101106A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP08004618A EP2101106A1 (en) 2008-03-12 2008-03-12 LED road lamp

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP08004618A EP2101106A1 (en) 2008-03-12 2008-03-12 LED road lamp

Publications (1)

Publication Number Publication Date
EP2101106A1 true EP2101106A1 (en) 2009-09-16

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ID=39590938

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08004618A Withdrawn EP2101106A1 (en) 2008-03-12 2008-03-12 LED road lamp

Country Status (1)

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EP (1) EP2101106A1 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2306787A2 (en) 2009-09-29 2011-04-06 Zanotta, M Patrizia Method for controlling a street lamp or a lamp for interiors to compensate ambient light
CN102518995A (en) * 2011-12-16 2012-06-27 福建德泓勤上光电科技有限公司 Multifunctional LED energy-saving street lamp
CN102606959A (en) * 2012-03-14 2012-07-25 泰州市华强照明器材有限公司 LED streetlamp
CN102705764A (en) * 2010-12-19 2012-10-03 西安智海电力科技有限公司 Uniform light radiating type photoelectric separation LED (Light Emitting Diode) droplight with sling chains and groove
WO2014161417A1 (en) * 2013-04-01 2014-10-09 深圳市耀嵘科技有限公司 Radiator and led flood lamp

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002101285A1 (en) * 2001-06-08 2002-12-19 Advanced Leds Limited Exterior luminaire
US6676279B1 (en) * 1999-10-04 2004-01-13 David A. Hubbell Area lighting device using discrete light sources, such as LEDs
DE20317444U1 (en) * 2002-11-15 2004-02-26 Bartenbach, Christian, Ing., Aldrans Lighting device, e.g. for roads, paths, open spaces has common, elongated, at least partly transparent light deflection body before row of light sources with pointed edge on side remote from sources
DE202006010949U1 (en) * 2006-07-14 2006-09-07 Chen, Chia-Yi, Donggang Light e.g. road lantern comprises framework and number of ribs, which are arranged at upper side of framework, number of LEDs at framework and transparent cover is fastened at lower side of the framework
US20070081338A1 (en) * 2005-10-06 2007-04-12 Thermalking Technology International Co. Illumination device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6676279B1 (en) * 1999-10-04 2004-01-13 David A. Hubbell Area lighting device using discrete light sources, such as LEDs
WO2002101285A1 (en) * 2001-06-08 2002-12-19 Advanced Leds Limited Exterior luminaire
DE20317444U1 (en) * 2002-11-15 2004-02-26 Bartenbach, Christian, Ing., Aldrans Lighting device, e.g. for roads, paths, open spaces has common, elongated, at least partly transparent light deflection body before row of light sources with pointed edge on side remote from sources
US20070081338A1 (en) * 2005-10-06 2007-04-12 Thermalking Technology International Co. Illumination device
DE202006010949U1 (en) * 2006-07-14 2006-09-07 Chen, Chia-Yi, Donggang Light e.g. road lantern comprises framework and number of ribs, which are arranged at upper side of framework, number of LEDs at framework and transparent cover is fastened at lower side of the framework

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2306787A2 (en) 2009-09-29 2011-04-06 Zanotta, M Patrizia Method for controlling a street lamp or a lamp for interiors to compensate ambient light
CN102705764A (en) * 2010-12-19 2012-10-03 西安智海电力科技有限公司 Uniform light radiating type photoelectric separation LED (Light Emitting Diode) droplight with sling chains and groove
CN102705764B (en) * 2010-12-19 2015-06-03 西安智海电力科技有限公司 Uniform light radiating type photoelectric separation LED (Light Emitting Diode) droplight with sling chains and groove
CN102518995A (en) * 2011-12-16 2012-06-27 福建德泓勤上光电科技有限公司 Multifunctional LED energy-saving street lamp
CN102606959A (en) * 2012-03-14 2012-07-25 泰州市华强照明器材有限公司 LED streetlamp
WO2014161417A1 (en) * 2013-04-01 2014-10-09 深圳市耀嵘科技有限公司 Radiator and led flood lamp

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