LED light systems and device for locomotives and narrow beam and multi beam applications

Abstract

The present invention relates to an improved LED light system and device for locomotives, stadiums and narrow single or multi beam angle applications wherein LEDs of a cluster are placed on a surface in close proximity in LED lamp unit for generating higher luminous stearance and a lens mechanism provides at least a first external lens and second lens for further collimation preferably bigger determined by the illumination requirements and the space available for the unit/system, mounted in a manner to generate at least one narrow angle beam for reaching a larger and/or lesser distance, the beam being symmetric or asymmetric, the LED Lamp designed for producing greater lamp life, higher efficiency, low maintenance and configurable as Twin, Triple, Quad & more LED Lamp lighting system. The invention improves upon the optical, thermal and electrical designs in terms of efficiency, maintainability, reliability and quality of light using LED clusters for the required area illumination of application for better visibility.

Claims

1. An LED light system for locomotives and alike narrow beam, multi-beam angle applications comprising: an LED lamp having at least one LED cluster mounted on a thermally conductive enclosure with substantially transparent cover, the at least one LED cluster including multiple LEDs placed on a surface in close proximity for generating higher luminous stearance and attached to the thermally conductive enclosure, at least one LED of the multiple LEDs having at least one single external lens and at least one LED of the multiple LEDs having at least one two lens arrangement for collimating the light from the at least one LED for generating a desired directional beam for distant illumination and spatial distribution control; and a power source connected to said LED Lamp through an output unit, wherein: the output unit includes at least one under and over control means (UOM), at least one sensing means, and a multi-feedback means (MFM) connected to said at least one under and over control means operating on the feedback from said at least one sensing means, the state of the at least one under and over control means depending upon the input received from said at least one sensing means; and a first lens of a two lens arrangement is positioned close to at least one LED and acts as a light collector for collecting most of light exited from the at least one LED and direct the collected light onto a second lens of the two lens arrangement mounted for collimating the collected light and generating the desired directional beam.

2. The LED light system as claimed in claim 1, wherein the at least one LED is a single chip LED or a multichip LED being a chip on board.

3. The LED light system as claimed in claim 1, wherein for the two lens arrangement, an intervening space forms an enclosure from the at least one LED up to the second lens to increase optical efficiency of light by further directing the light not falling onto the first or second lenses due to any reason including Fresnel effect, said enclosure having a suitable reflecting surface, and wherein the two lens arrangement is mounted to generate the desired directional beam through its dual mechanism by varying a mounting position of the dual mechanism with respect to the at least one LED, individually or either independently or jointly.

4. The LED light system as claimed in claim 1, wherein the collimation of the collected light is asymmetrical such that the light is narrower on one axis and wider on the other axis to give longitudinal or horizontal or wider illumination along any required axis, and wherein the asymmetrical collimation is achieved through at least one of the single external lens or the two lens arrangement.

5. The LED light system as claimed in claim 1, wherein the at least one single external lens is mounted at an angle with respect to an optical axis of the at least one LED to tilt light beam exited from the at least one LED.

6. The LED light system as claimed in claim 1, wherein said output unit is integrated within the LED light system.

7. The LED light system as claimed in claim 1, further comprising a surge protection device (SPD).

8. The LED light system as claimed in claim 7, wherein when an external surge protection device [ESPD] is provided, the output unit is provided with an internal spike control/MOV having a higher voltage than that in the SPD so that the MOV in the SPD would fail being operative at a lower voltage in an event cut off is not provided or provided and does not operate protecting the MOV in the output unit and thereby the output unit, the at least one LED would be prevented from replacement and the SPD placed at a convenient location is easily replaced thereby reducing cost of spares and maintenance.

9. The LED light system as claimed in claim 7, wherein when the combination of the SPD and the MOV is inside the output unit, the MOV of the output unit has a higher operating voltage than the MOV inside the SPD followed by a self-restoring cut-off which shall be lowest in operating voltage and as long as the cut-off operates the entire system operation shall be self-restoring when voltage surge diminishes and operating voltage is within a specified limits of normal operation.

10. The LED light system as claimed in claim 1, wherein a dimming facility is provided for reducing an average current flowing through at least one LED with power saving.

11. The LED light system as claimed in claim 1, wherein a means is provided for shifting an illumination axis of light exited from the at least one LED by changing a mounting angle of the at least one single external lens or the two lens arrangement with respect to the at least one LED, and wherein a dip and/or dim means is optionally provided to produce a dip and/or dim beam by having shifted illumination axis LEDs lit and others LEDs on unshifted illumination axis unlit.

12. The LED light system as claimed in claim 1, wherein the LED light system is a multi-lamp system having multiple LED lamps, the light system further comprising: an adjustment means for directing light beams exiting the LED lamps in same coherent direction, or different directions with respect to each other; and a second adjustment means for directing light beams exiting the multi-lamp system with respect to a locomotive/mounting plane.

13. The LED light system as claimed in claim 1, wherein the output unit facilitates energy efficient conversion, through a driver circuit allowing the power source and its variations to be matched to a controlled drive required for the at least one LED with input and/or output control using the at least one under over control means, as per the requirement of different voltage and/or current of the series and parallel combination of the at least one LED cluster.

14. The LED light system as claimed in claim 1, wherein the sensing means is at least one of a current sensing means, a voltage sensing means, a temperature sensing means, an optical sensing means or any combination thereof.

15. The LED light system as claimed in claim 1, wherein the thermally conductive enclosure is provided with heat sink fins for faster extraction of heat, since due to space limitations the thermally conductive enclosure surface becomes inadequate for thermal management.

16. The LED light system as claimed in claim 1, wherein the two lens arrangement includes an enclosure having an external as well as an internal reflecting surface.

17. The LED light system as claimed in claim 1, wherein the LED light system has an active or a passive shunt that is at least: across a series of at least one LED cluster to reduce the current flow through the at least one LED to reduce the illumination/dimming of light, and across each LED in series in the at least one LED cluster to prevent failure in the event of open circuit of each of the LED.

18. The LED light system as claimed in claim 1, wherein the output unit is connected to the LED lamp system via a solar panel and a rechargeable battery to perform charge controller function and battery power discharge controller with necessary protections of overcharging, deep discharging.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The invention is further illustrated by way of following figures which should not be construed to limit the scope of the invention.

(2) FIGS. 1(a), 1(b), 1(c), 1d(i)-(a) and (b), 1d(ii)-(a) and (b) show by way of an example some of the typical constituents of the LED Lamp.

(3) FIG. 2 shows a metal Lamp Mounting Frame (8) having cut outs (9) and (10) for mounting of lamp units.

(4) FIGS. 3 (a) and 3(b) show typical wiring diagrams of SPD (Surge protection Device), output unit, cable & selector switch for a locomotive application using twin LED lamps.

(5) FIGS. 4 (a) to (f) show some examples of the interconnections of power source, output unit, LED cluster, and SPD.

(6) FIG. 5 shows the output unit (2) and its important sub units.

(7) FIG. 6 shows LED Cluster, LED Lamp assembly with Output Unit connected to the LED Cluster to Drive it, LED Solar Panel and Rechargeable Battery to perform Charge Controller function & Battery power discharge controller with necessary protections of overcharging, deep discharging.

DETAILED DESCRIPTION OF INVENTION

(8) The present invention provides a LED Multi Beam Light System giving more reliability, redundancy for locomotives such as railways and other narrow beam applications such as signals, stadium light and alike comprising the following advantages by way of an example for Twin beam Halogen Light used for locomotives on Indian Railways: 1. Power Saving of greater than 65% (approximately 6.5 Billion Watt Hours per annum on Indian Railways. 2. Return on investment of approximately 3 years (since power used on locomotive is very expensive considering all the transmission & conversion losses) 3. Meets & improves upon the current Indian Railway Specification for Locomotive Headlights. 4. Illumination improvement more than 20% with LED multi-beam twin Head Lamp Unit 5. Much superior spectrum for Night visibility (White Light) 6. Most superior light source for human eye 7. Configurable as Twin, Triple, Quad Head Lamp Unit and required variation in illumination pattern. 8. More Useful for Resolution of objects on track and visibility on curves/turns. 9. Works directly on 110V DC/72V DC. 10. No separate DC-DC Converter Unit required 11. Lamp life of greater than 25000 hours. 12. No periodic lamp changing required; 13. Maintenance free and 14. No focusing required.

(9) The present invention is illustrated by way of figures, wherein in FIGS. 1 a, b, c, feature (11) shows the lamp enclosure which is thermally conductive acts as a heat sink as well and which may optionally have heat sink fins as shown in 11(a) as per the design requirements; feature (12) shows the PCB mounting the LEDs which preferably is MCPCB and mounted on the enclosure with thermally conductive medium; feature (3) shows the LED chip with its own optics, feature (14) shows first external lens preferably designed and placed in a manner to collect most of the light emitted by the conventional, power, single chip, multi-chip LED (13) and collimates it; and feature (15) shows the enclosure covering the space between the first external lens and the second external lens comprising a part of the twin lens assembly. The internal surface of the enclosure, being adequately reflective to redirect the stray light in the assembly generated due to Fresnel affect, or any reason causing reflection of the light from the lenses in the assembly, any lack of collection by the first lens or any other reason. The external surface of the enclosure may also be adequately reflective to reflect out the light not exiting the Lamp as may be caused due to the external lens (16) function shown in FIG. 1 (a), the single lens being placed close to the conventional LED with its optical axis coinciding with the LED optical axis or tilted as shown in feature (19) to achieve the desired function, placed in their respective positions with suitable mounting arrangement. Feature (17) shows the External transparent or Translucent cover.

(10) FIGS. 1d(i)-(a)&(b) show a single LED Assembly (13) which may be at least one chip based where the front cover is the also the external/second lens with differential lensing, and curved surface to minimise the reflection external light to the viewer and reduce phantom affect. FIG. 1d(i)-(a) shows higher power lensing in the centre, FIG. 1d(i)-(b) shows differential lensing online part of the lower half of the lens.

(11) FIG. 1d(ii)-(a)&(b) also show similar lensing combination with more than one LED in the LED Lamp.

(12) In FIG. 2, the cut outs (9) and (10) allow the light exiting from the glass/transparent cover of the LED lamps to go through and the rest of the area being metal, the need for bird guard, when mounted on a vehicle, locomotive is avoided, thus, there is no obstruction to the light exiting the lamp units.

(13) FIGS. 3(a) and 3(b) show a typical wiring diagram of SPD (Surge protection Device) 5(b)(Main) & 5(b) Spare SPD unit which would be wired through a manual or automatic switch selection to become available as a Standby optionally with Indicator, in the event the Main SPD becomes unserviceable to continue the availability of the LED Light System, output unit (2) connecting the controlled DC output power to the LED Lamps through 6(a)& 6(b) and optionally connection as in feature (7) for Light Output change, DIP/DIM operation. Feature (3) shows by way of an example DIP/DIM and main, Power ON/OFF selector switch, cable and other components for a locomotive or any LED lighting application, using twin LED Lamps by way of an example. Feature (4) shows as LED Lamp having its thermal enclosure and transparent cover and connected to the power source (1) via output unit (2), may have a single LED array forming the LED cluster and fed through output unit via 6a and 6b. It is desirable to have independent controlled drive to each array from the output unit, thus where LED cluster is formed by more than one array it is desirable to have two separate controlled outputs for each array from the output unit for redundancy and reliability.

(14) The head light at FIG. 3b) shows at feature 3 which is a selector switch which facilitates selection of main beam or DIP/DIM beam through the output unit which not only regulates the varying voltage coming from the power source but upon the control line selected by the selector switch through which the power source itself may be fed. The output unit will operate the LED lamp through 6a and 6b when main beam is selected, when DIP/DIM beam is selected the output unit may reduce the current of the main beam itself in which case connection 7 may not be used/present. Alternatively, 6a, 6b may operate the lamp unit in conjunction with 7 to reduce the illumination and/or dip the illumination, where 7 may be a single or a double conductor per LED array/cluster, to cause switching ON or OFF of part of an array, increase reduce current of an array, or conduct any change to cause Dipping or Dimming of the Light output of the LED Lamp.

(15) In FIG. 4 (a, b, c, d, e, f) the power source (1) may be AC or DC and having its variation range and with possibilities of fluctuation, output Unit (2) which may be connected away from the LED Cluster (LED Lamp, assembly as per the invention) (4) through cable and components (Switches/junctions etc.) (3), the Output unit can be nearer to the LED Lamp, integrated with the LED Lamp, in-built with the LED Lamp (LED Cluster), One output Unit may feed more than one LED Lamp and the Surge Protection Device (SPD) (5) can be connected away from LED Lamp/s at a convenient location for easy replacement, or near to the LED lamps.

(16) FIG. 5 shows the output unit (2) which in accordance to the invention shall have under over control means (6), multi-feedback means (7) and sensing means (8). LEDs are optionally provided in the LED cluster (4) which by virtue of their construction either can mostly fail as a short, for example, where p-n junction is directly bonded to the electrical contact instead of wire bond and/or the LED is internally provided with a electrostatic or such protection discharge device such as Zener across the LED p-n junction which generally acts as a shunt and would generally fail as a short.

(17) FIG. 6 shows LED Cluster, LED Lamp assembly with Output Unit connected to the LED Cluster to Drive it, LED Solar Panel and Rechargeable Battery to perform Charge Controller function & Battery power discharge controller with necessary protections of overcharging, deep discharging.

(18) One of the main embodiment of the present invention comprises a LED light system for locomotives and alike narrow beam, multi-beam angle applications comprising: a LED Lamp having at least one LED cluster (4), mounted on a thermally conductive enclosure (11) with substantially transparent cover (17), at least one conventional LED inclusive of its in-built optics in the LED Lamp having at least one external lens (14), at least one LED having a twin external lens (16) to further collimate the light for narrow angle beam for distant illumination, spatial distribution control and a power source (1) connected to said LED Lamp through an output unit (2)
wherein, the output unit (2) comprises at least one under and over control means (UOM)(6) and at least one sensing means (8) and a multi-feedback means (MFM) (7) connected to said under and over control means (6) operating on the feedback from said at least one sensing means (8), the state of the under and over control means (6) depending upon the input received from said at least one sensing means (8) and the LED's and/or optics of a cluster are placed on a surface in close proximity for generating higher luminous stearance and the said LEDs of the cluster have a thermal control means attached to each LED and the said thermal control means is formed by a thermally conductive enclosure wherein the lens in the twin lens placed close to the LED Light source is such that it acts as a light collector for most of the exited light from the conventional LED cum collimator which acts as a virtual low loss reflector and collimates most of the light onto the second lens mounted such that the desired directional beam is generated.

(19) Yet another embodiment of the present invention comprises of a LED light system for locomotives and alike narrow beam, multi-beam angle applications wherein at least one LED, the said LED having at least one LED chip or multichip LED being a chip on board.

(20) Still another embodiment of the present invention comprises of a LED light system for locomotives and alike narrow beam, multi-beam angle applications wherein the transparent cover (16, 17) itself is the second lens.

(21) Still yet another embodiment of the present invention comprises of a LED light system for locomotives and alike narrow beam, multi-beam angle applications wherein, the twin lens comprises intervening space formed into an enclosure to increase the optical efficiency of the beam intensity by further directing the light not falling on to the lens due to any reason including Fresnel effect, the said enclosure having a suitable reflecting surface.

(22) Yet another embodiment of the present invention comprises of a LED light system for locomotives and alike narrow beam, multi-beam angle applications wherein the twin lens is optionally mounted to generate the desired narrow angle beam through its dual mechanism by varying the mounting position of the dual mechanism with respect to LED, individually or either independently or jointly to generate an efficient collimated beam.

(23) Yet another embodiment of the present invention comprises of a LED light system for locomotives and alike narrow beam, multi-beam angle applications wherein, the beam angle of the LED source and the size of the first lens are optionally selected, to have all the LED light fall on the first lens surface.

(24) Still yet another embodiment of the present invention comprises of a LED light system for locomotives and alike narrow beam, multi-beam angle applications wherein, optionally the inner lens is smaller and outer lens is bigger so that the outer lens can have reduced thickness, higher focal length and yet to collect the entire light exiting the first lens.

(25) Yet another embodiment of the present invention comprises of a LED light system for locomotives and alike narrow beam, multi-beam angle applications wherein, the collimation of the light is optionally asymmetrical, i.e. narrower on one axis and wider on the other axis to give longitudinal or horizontal or wider illumination along any required axis.

(26) Still another embodiment of the present invention comprises of a LED light system for locomotives and alike narrow beam, multi-beam angle applications wherein, the asymmetrical pattern is optionally achieved through a single external lens.

(27) Another embodiment of the present invention comprises of a LED light system for locomotives and alike narrow beam, multi-beam angle applications wherein, the asymmetrical pattern is optionally achieved through a twin external lens.

(28) Still another embodiment of the present invention comprises of a LED light system for locomotives and alike narrow beam, multi-beam angle applications wherein, the lens and LED assemblies are optionally placed in close proximity to form a combined mono axis or multi axis beam, symmetrical and/or asymmetrical.

(29) Yet another embodiment of the present invention comprises of a LED light system for locomotives and alike narrow beam, multi-beam angle applications wherein, the single external lens is mounted with its optical axis with respect to the optical axis of the LED at an angle for one or more LED's in the LED cluster (4) of the lamp, to tilt its beam with respect to the optical axis of the LED lamp.

(30) Still yet another embodiment of the present invention comprises of a LED light system for locomotives and alike narrow beam, multi-beam angle applications wherein, the said output unit (2) is optionally integrated within the lamp unit.

(31) Yet another embodiment of the present invention comprises of a LED light system for locomotives and alike narrow beam, multi-beam angle applications wherein, at least one surge protection device (SPD) (5) is optionally integrated or separate with the output unit (2). Still yet another embodiment of the present invention comprises of a LED light system for locomotives and alike narrow beam, multi-beam angle applications wherein, the said surge protection device (5) is optionally a spare unit separate or integrated as a switchable standby SPD unit.

(32) Yet another embodiment of the present invention comprises of a LED light system for locomotives and alike narrow beam, multi-beam angle applications wherein, the surge protection device (SPD) (5) shall be optionally provided with at least one spike arrestor/MOV and a fuse.

(33) Still another embodiment of the present invention comprises of a LED light system for locomotives and alike narrow beam, multi-beam angle applications wherein, SPD (5) shall be optionally provided with spike arrestor/MOV and a Gas Discharge tube, in which case fuse may or may not be provided.

(34) Further yet another embodiment of the present invention comprises of a LED light system for locomotives and alike narrow beam, multi-beam angle applications wherein, the SPD is optionally self-restoring wherein it shall cut off when the surge/overvoltage is greater than duration T1.

(35) Yet still another embodiment of the present invention comprises of a LED light system for locomotives and alike narrow beam, multi-beam angle applications wherein, the said SPD is optionally self-restoring with cut off lower than the operating voltage of the MOV in the SPD wherein spike arrestor/MOV shall absorb the surges up to duration (T1).

(36) Another embodiment of the present invention comprises of a LED light system for locomotives and alike narrow beam, multi-beam angle applications wherein, when external surge protection device [ESPD] is provided, the output unit (2) may be optionally provided with internal spike control/MOV which then is of higher voltage than that in SPD so that MOV in the SPD would fail being operative at a lower voltage in the event cut off is not provided or provided and does not operate protecting the MOV in the output unit (2) and thereby the output unit (2), LED Light would be prevented from replacement & SPD placed at a convenient location can be easily replaced thereby reducing the cost of spares and maintenance.

(37) Still another embodiment of the present invention comprises of a LED light system for locomotives and alike narrow beam, multi-beam angle applications wherein, when the combination of SPD & MOV is inside the output unit (2), MOV of the output unit (2) shall optionally have the higher operating voltage than the MOV inside the SPD followed by the self-restoring cut-off which shall be lowest in operating voltage and as long as the cut-off operates the entire system operation shall be self-restoring when voltage surge diminishes and operating voltage is within the specified limits of normal operation.

(38) Yet another embodiment of the present invention comprises of a LED light system for locomotives and alike narrow beam, multi-beam angle applications wherein, the high voltage and/or low voltage cut off is provided.

(39) Still yet another embodiment of the present invention comprises of a LED light system for locomotives and alike narrow beam, multi-beam angle applications wherein, if the high voltage cut off is the lowest operating voltage then optionally the high voltage cut-off may not be provided in the SPD.

(40) Yet still another embodiment of the present invention comprises of a LED light system for locomotives and alike narrow beam, multi-beam angle applications wherein, at least one output unit (2) is optionally a spare unit.

(41) Yet another embodiment of the present invention comprises of a LED light system for locomotives and alike narrow beam, multi-beam angle applications wherein, the said LED lamp has at least one LED having a twin lens to direct the light.

(42) Still another embodiment of the present invention comprises of a LED light system for locomotives and alike narrow beam, multi-beam angle applications wherein, dimming facility is provided optionally for reducing the average current flowing through LEDs with power saving.

(43) Yet another embodiment of the present invention comprises of a LED light system for locomotives and alike narrow beam, multi-beam angle applications wherein, a switch control is optionally provided to produce a dip and/or dim means for reducing and/or changing the direction of the light or leaving lit only the changed beam direction of LED light sources.

(44) Still yet another embodiment of the present invention comprises of a LED light system for locomotives and alike narrow beam, multi-beam angle applications wherein, a means is optionally provided for shifting the illumination axis of the light by changing the mounting angle of the lens with respect to the LED i.e. the mounting axis of the lens with respect to the mounting axis of the LED or the mounting axis of the LED itself along with its lens by changing the mounting axis of the surface for the LED in the enclosure.

(45) Still yet another embodiment of the present invention comprises of a LED light system for locomotives and alike narrow beam, multi-beam angle applications wherein, a means is optionally provided to produce a dip and/or dim means by having the shifted illumination axis LEDs lit and others on the main illumination axis unlit.

(46) Yet another embodiment of the present invention comprises of a LED light system for locomotives and alike narrow beam, multi-beam angle applications wherein, an external control interface is provided to activate the DIP/DIM or main or combined beams.

(47) Still yet another embodiment of the present invention comprises of a LED light system for locomotives and alike narrow beam, multi-beam angle applications wherein, each beam is optionally defined as the beam formed by using at least one LED or a cluster of LEDs wherein even with cluster of LEDs each LED lamp unit may have multi-directional beams.

(48) Yet another embodiment of the present invention comprises of a LED light system for locomotives and alike narrow beam, multi-beam angle applications wherein the LED light system, wherein the dimming facility optionally uses the external SPD that may be installed before the dimming selection switch where the Dimming line & the Main (full light) line are separated but carry the same power supply.

(49) Yet another embodiment of the present invention comprises of a LED light system for locomotives and alike narrow beam, multi-beam angle applications wherein, the light/lamp is optionally sealed with at least one cover preferably glass to prevent ingress of water and dust, wherein the transparent cover of the LED Lamp is optionally formed using a toughened glass. Yet another embodiment of the present invention comprises of a LED light system for locomotives and alike narrow beam, multi-beam angle applications wherein, the said beam lamp or lamps are optionally replaceable.

(50) Another embodiment of the present invention comprises of a LED light system for locomotives and alike narrow beam, multi-beam angle applications wherein, the lamps cover is optionally kept small enough to have adequate impact strength and comprises optionally adequate cut-outs in a metal mounting frame to allow full light emission to avoid the need of bird guards.

(51) Yet another embodiment of the present invention comprises of a LED light system for locomotives and alike narrow beam, multi-beam angle applications wherein, optionally one adjustment means is provided for making the beam lights exiting the LED Lamps in a multi-lamp system in the same direction coherent, or adjustment in any direction with respect to each other.

(52) Yet another embodiment of the present invention comprises of a LED light system for locomotives and alike narrow beam, multi-beam angle applications wherein, optionally second adjustment means is provided for directing the said multi-lamp beam light with respect to the locomotive/mounting plane.

(53) Yet another embodiment of the present invention comprises of a LED light system for locomotives and alike narrow beam, multi-beam angle applications wherein, each beam is optionally defined as the beam formed by using at least one LED lamp unit and multi-beam is formed by more than one such LED Lamp unit.

(54) Still yet another embodiment of the present invention comprises of a LED light system for locomotives and alike narrow beam, multi-beam angle applications wherein, the output unit (2) facilitates energy efficient conversion, through a driver circuit allowing the Power source (1) and its variations to be matched to the controlled drive required for the LEDs with input and/or output control using under over control means, as per the requirement of different voltage and/or current of the series and parallel combination of the LED array cluster.

(55) Yet still another embodiment of the present invention comprises of a LED light system for locomotives and alike narrow beam, multi-beam angle applications wherein, the sensing means (8) is selected from a current sensing means, voltage sensing means, temperature sensing means, optical sensing means or any combination thereof.

(56) Further yet another embodiment of the present invention comprises of a LED light system for locomotives and alike narrow beam, multi-beam angle applications wherein, the thermally conductive enclosure is provided with heat sink fins for faster extraction of heat, since due to space limitations the thermally conductive enclosure surface becomes inadequate for thermal management.

(57) Yet another embodiment of the present invention comprises of a LED light system for locomotives and alike narrow beam, multi-beam angle applications wherein, the said LED's of a cluster are optionally placed on a substantially flat single or multisided surface.

(58) Still another embodiment of the present invention comprises of a LED light system for locomotives and alike narrow beam, multi-beam angle applications wherein, the twin lens comprises of an enclosure having an external as well as internal reflecting surface.

(59) Yet still another embodiment of the present invention comprises of a LED light system for locomotives and alike narrow beam, multi-beam angle applications wherein, the said system optionally has an active or a passive shunt across a series of said LED cluster (4) to reduce the current flow through LED's to reduce the illumination/dimming of light.

(60) Yet another embodiment of the present invention comprises of a LED light system for locomotives and alike narrow beam, multi-beam angle applications wherein, active or passive shunt is optionally provided across each LED in series in the LED cluster (4) to prevent failure in the event of open circuit failure of the LED.

(61) Further, yet another embodiment of the present invention comprises of a LED light system for locomotives and alike narrow beam, multi-beam angle applications wherein, the said LEDs are optionally provided in the LED cluster (4).

(62) Still yet another embodiment of the present invention comprises of a LED light system for locomotives and alike narrow beam, multi-beam angle applications wherein, the said LED light device is as headlights for locomotives, stadium and other narrow beam applications.

(63) Although, the present invention has been described with reference to features, it will be apparent to those skilled in the art that this description is only a preferred embodiment and does not limit the scope of the present invention. Variations and modifications are possible without departing from the scope and spirit of the invention disclosed/described herein and are intended to be encompassed therein.