TECHNICAL FIELD
The present disclosure relates to a Lighting system. More particularly relates to Luminaire comprising array of Light Emitting Diodes (LEDs) with improved light distribution  heat dissipation and ingress protection in the luminaire.

BACKGROUND
Cluster or array of LEDs are sealed onto a panel of the luminaire and are assembled to a heat sink to form a luminaire
LEDs as light sources generate more heat during its operation. The LEDs are very sensitive to temperature. Increase in surrounding temperature around the LEDs drastically reduces the efficiency of LEDs output. Hence  it is essential to maintain the temperature within its safe limits. More particularly  at base of the LED there is tremendous amount of heat generated which heats up the entire system and reduces the working life of the LEDs. It is therefore very crucial to dissipate the generated heat out of the luminaire.

One type of heat sink used for LED Streetlights are similar in design to that of heat sinks used in computers. The heat sinks have grooves to facilitate flow of hot air away from the LEDs. Area of heat exchange provided in the luminaire affects the lifespan of the LED Streetlight.

An LED streetlight with high power LEDs has some unique requirements for proper functioning. LEDs are directional light sources. In order to achieve the desired illumination pattern  light distribution and light throw  they need to be carefully directed with precise optics for better distribution of the light over a larger area.

LEDs and its driver  being electronic components  are sensitive and may fail in case of contact with moisture. The light levels may drop if dust accumulates over the light emitting surface or the diffuser cover. A streetlight being an outdoor luminaire is completely exposed to dust and rains. Hence it is essential to maintain high level of ingress protection. In Ingress protection  the main working components of the system are protected from environmental conditions like rain  dust  heat etc. to ensure optimum output and proper working of the LED lighting system for many years.

SUMMARY
The shortcomings of the prior art are overcome and additional advantages are provided through the provision as claimed in the present disclosure. Additional features and advantages are realized through the techniques of the present disclosure. Other embodiments and aspects of the disclosure are described in detail herein and are considered a part of the claimed disclosure.

In an embodiment of the disclosure  a system for heat dissipation in a luminaire system  characterized in that: a housing comprising a plurality of cooling fins disposed in a predetermined manner onto a top surface of the housing; a plurality of LEDs placed in predetermined manner and are connected to inner surface of the housing and; a plurality of spines are provided on the housing in predetermined manner  perpendicular to the fins and at the base of LEDs wherein said spines connect the base of the LEDs and the cooling fins for heat transfer.

In one embodiment  the housing is made of material selected from a group comprising aluminum and its alloys.

In one embodiment  the housing is in a certain curved shape.

In one embodiment  the LEDs are arranged on plurality of angular pads onto the housing along its length.

In one embodiment  the LED angular pads are characterized into central angular pads  intermediate angular pads placed on either side of the central angular pads and outer angular pads placed on either side of the intermediate angular pads.

In one embodiment  the intermediate angular pads are placed at an angle ranging from about 50o to about 60o and outer angular pads are placed at an angle ranging from about 28o to about 38o.

In one embodiment  a thermally conductive paste is filled in between base of the LEDs and the spines to fill air gaps for effective thermal conductivity.

In one embodiment of the disclosure  a method of assembling system for heat dissipation in a luminaire system  said method is characterized in that; mounting plurality of LEDs in predetermined manner on inner surface of housing and; a plurality of spines in the housing in predetermined manner  such that said spines makes contact between base of the LEDs and cooling fins of the housing for heat transfer.

In one embodiment of the disclosure  a method of assembling system for heat dissipation in a luminaire system  said method is characterized in that; mounting the LED driver on the inner surface of housing in control gear compartment; such that heat generating components of the LED driver directly touch the housing to transfer heat to cooling fins.

The foregoing summary is illustrative only and is not intended to be in any way limiting. In addition to the illustrative aspects  embodiments  and features described above  further aspects  embodiments  and features will become apparent by reference to the drawings and the following detailed description.

BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
The features described in this disclosure are set forth with particularity in the appended claims. These features and attendant advantages will become apparent from consideration of the following detailed description  taken in conjunction with the accompanying drawings. One or more embodiments are now described  by way of example only  with reference to the accompanying drawings wherein like reference numerals represent like elements and in which:
FIG. 1 shows perspective view of the LED luminaire system according to the disclosure.
FIG. 2 shows sectional view of the LED luminaire system illustrating front LED zone with heat dissipating elements according to the disclosure.
FIG. 3 shows sectional view of the Heat dissipation system according to the disclosure.
FIG 4 shows sectional view of the LED luminaire system illustrating the compartments with respective heat dissipating elements according to the disclosure.

The figures depict embodiments of the disclosure for purposes of illustration only. One skilled in the art will readily recognize from the following description that alternative embodiments of the structures and methods illustrated herein may be employed without departing from the principles of the disclosure described herein.

DETAILED DESCRIPTION
In the following detailed description  reference is made to the accompanying drawings  which form a part hereof. In the drawings  similar symbols typically identify similar components  unless context dictates otherwise. The illustrative embodiments described in the detailed description  drawings  and claims are not meant to be limiting. Other embodiments may be utilized  and other changes may be made  without departing from the spirit or scope of the subject matter presented herein. It will be readily understood that the aspects of the present disclosure  as generally described herein  and illustrated in the figures  can be arranged  substituted  combined  and designed in a wide variety of different configurations  all of which are explicitly contemplated and make part of this disclosure.

FIG. 1 is an exemplary embodiment of the disclosure and illustrates a perspective view of the luminaire system (101). The luminaire system (101) consists of plurality of compartments such as an optical compartment (103) at front end  a control gear compartment (104) adjacent to the optical compartment (103) and a connector compartment (105) extending from the control gear compartment (104). The optical compartment (103) is characterized into a parabolic shape to focus the light onto a desired area. The optical compartment (103) is connected to a plurality of reflectors (23) of predetermined shape that are placed below angular base pads of the luminaire system (101). Light sources of predetermined shapes and numbers are mounted below the reflectors (23) in a predetermined pattern. The light source can be Light Emitting Diodes (LED) (22) of various wattages. The reflectors (23) have an internal reflective surface with a mirrored appearance. The reflectors (23) are faceted and are coated with specular aluminium for high reflectivity to direct the light at desired location. A diffuser (16) is sealed to the optical compartment (103) using a silicone sealant. The diffuser (16) distributes the light evenly to the desired location. The optical compartment (103) is sealed with an optical compartment cover (11). The optical compartment cover (11) is formed in a parabolic shape such that it conforms easily gets fastened to the optical compartment (103) using screws (25). A gasket (17) is placed between the optical compartment cover (11) and the optical compartment (103) in order to provide ingress protection for the lighting components inside the optical compartment (103). The gasket (17) is made up of Ethylene Propylene Diene Monomer (EPDM)  Silicone  Cross Linked Poly Ethylene (XLPE). The cooling fins (31) of predetermined thickness of minimum 3mm are disposed on top exterior surface of the optical compartment (103) in pattern of rows following the curved shape of the optical compartment (103) to transfer the heat generated from the LEDs (22) to the atmosphere. Perpendicular running spines (30) of average thickness of 8mm are provided at the base of the LED light source. The LEDs (22) are firmly connected to the spines (30) by a thermal conductive paste. The spines (30) increase the heat dissipating area and further transfer heat to the cooling fins (31).

A control gear compartment (104) located adjacent to the optical compartment (103) is incorporated with a control gear (24). The control gear (24) acting as driver drives the whole lighting system. The control gear (24) is connected to an electrical connector (not shown in Figs) and the light source through cables. The control gear compartment (104) is covered with a control gear compartment cover (12) using screws (25). The control gear compartment cover (12) provides protection against any accidental human intervention. Further the gasket (17) provides ingress protection against dust and moisture. A plurality of cooling fins (32) of predetermined thickness is provided on top surface of the control gear compartment (104). The cooling fins (32) dissipate heat generated by the driver to the atmosphere.

A pole mount top (14) extends from the control gear compartment (104). A connector compartment (105) provided on the pole mount bottom (15). Electrical connectors along with an earthing terminal (not shown in Figs.) are mounted within the connector compartment (105). A connector compartment cover (13) is connected to the connector compartment (105) by screws (25) with an EPDM gasket (17) to provide ingress protection to the connector and earthing terminal. This separate placement of the connector helps maintaining the ingress protection to the control gear (24) during product installation and connection to mains.
Compartmentalization of the luminaire system (101) with separate covers secured with gaskets (17) ensures the ingress protection against accidental human intervention as well as dust and moisture.

FIGS. 2 and 3  illustrates sectional view of a luminaire system (101) comprising heat dissipating elements. The luminaire system (101) comprises a system (102) for heat dissipation. The system (102) comprises housing (10) comprising a plurality of cooling fins (31) disposed in a manner of parallel rows onto a top surface of the housing (10). A plurality of LEDs (22) is placed in predetermined manner and is connected to inner surface of the housing (10). A plurality of spines (30) are placed on the top surface of the housing (10a) in predetermined manner  wherein said spines (30) are perpendicular to the fins act as a junction between base of the LEDs (22) and the cooling fins (31) for heat transfer. The housing (10  10a) is made of material selected from a group comprising aluminum and its alloys. The housing (10) is in a certain curved shape. The LEDs (22) are arranged on plurality of angular pads (21) on the inside surface of the housing (10) along its length. The angular pads (21) are characterized into central angular pads (33)  intermediate angular pads (34) placed on both side of the central angular pads (33) and outer angular pads (35) placed on either side of the intermediate angular pads (34). The intermediate angular pads (34) are placed at an angle ranging from about 50o to about 60o and outer angular pads (35) are placed at an angle ranging from about 28o to about 38o. The space between LED base and the pads is filled with a thermally conductive paste to fill air gaps for effective thermal conductivity.

Typically  LED luminaire have extruded aluminium heat sinks placed at the base of LEDs (22)  which are then held together. There are a lot of air gaps in such assemblies and hence ineffective thermal transfer takes place. This leads to a lot of temperature build-up in the luminaire  which in turn leads to inefficient working and shortens the life for LEDs (22).

Positive contact of LED bases to heat sink with no air gaps  aid in effective heat dissipation.

The thermal management system wherein the LEDs (22) are directly mounted on the luminaire body. A thermally conductive paste is filled in between the LED (22) base and the luminaire body to cap micro level gaps  on the top surface of the housing is integral cooling fins (31) that increase the surface area to radiate heat effectively.

A plurality of spines (30) placed directly at the base of the LEDs (22) increase the material thickness at the highest temperature points and evenly distributes the heat over the fins.

FIG. 4  illustrates sectional view of a luminaire system (101) comprising heat dissipating elements. The luminaire system (101) comprises a system (102) (shown in Fig. 3) for heat dissipation. The system (102) comprises housing (10) including a plurality of cooling fins (31) disposed in a manner of parallel rows onto a top surface of the housing (10) of the optical compartment (103) and a plurality of cooling fins (32) disposed onto a top surface of the housing (10a) of the control gear compartment (104).
A plurality of LEDs (22) is placed in predetermined manner on the inner surface of the housing (10) in the optical compartment (103). A plurality of spines (30) runs perpendicular to the fins acting as a junction between base of the LEDs (22) and the cooling fins (31) for heat transfer.
The LED driver (24) is mounted on the inner surface of the housing (10a) in the control gear compartment (104)  with the heat generating components directly touching the housing (10a)  for effective heat transfer to the cooling fins (32) on the outer side of the control gear compartment (104) and hence to the atmosphere.

The body is made from high quality heat conductive aluminium which transfers heat efficiently from the LED (22) base to the atmosphere resulting in better thermal management.

Thus the entire product structure is such that  the entire body acts a heat sink for optimum thermal management and compartmentalized for maintaining high level of ingress protection.

REFERENCE NUMERALS

10 Housing top (Optical compartment)
10a Housing top (Control gear compartment)
11 Optical compartment cover
12 Control Gear compartment cover
13 Connector compartment cover
14 Pole mount top
15 Pole mount bottom
16 Diffuser
17 Gasket
21 Angular pads
22 LED
23 Reflectors
24 Control Gear/Driver
25 Screws
30 Spines
31  32 Cooling Fins
33 Central Angular pads
34 Intermediate Angular pads
35 Outer Angular pads
101 Luminaire system
102 System
103 Optical Compartment
104 Control Gear compartment
105 Connector Compartment

Industrial Applicability and advantages
The disclosed system finds potential application in Lighting systems comprising LEDs as lighting source. The system facilitates the efficient heat dissipation from the LED bases which increases the life of LEDs used in the luminaire system. The disclosed system can also be used in devices apart from the lighting system where the heat dissipation is necessary.

Equivalents
With respect to the use of substantially any plural and/or singular terms herein  those having skill in the art can translate from the plural to the singular and/or from the singular to the plural as is appropriate to the context and/or application. The various singular/plural permutations may be expressly set forth herein for sake of clarity.

It will be understood by those within the art that  in general  terms used herein  and especially in the appended claims (e.g.  bodies of the appended claims) are generally intended as “open” terms (e.g.  the term “including” should be interpreted as “including but not limited to ” the term “having” should be interpreted as “having at least ” the term “includes” should be interpreted as “includes but is not limited to ” etc.). It will be further understood by those within the art that if a specific number of an introduced claim recitation is intended  such an intent will be explicitly recited in the claim  and in the absence of such recitation no such intent is present. For example  as an aid to understanding  the following appended claims may contain usage of the introductory phrases “at least one” and “one or more” to introduce claim recitations. However  the use of such phrases should not be construed to imply that the introduction of a claim recitation by the indefinite articles “a” or “an” limits any particular claim containing such introduced claim recitation to inventions containing only one such recitation  even when the same claim includes the introductory phrases “one or more” or “at least one” and indefinite articles such as “a” or “an” (e.g.  “a” and/or “an” should typically be interpreted to mean “at least one” or “one or more”); the same holds true for the use of definite articles used to introduce claim recitations. In addition  even if a specific number of an introduced claim recitation is explicitly recited  those skilled in the art will recognize that such recitation should typically be interpreted to mean at least the recited number (e.g.  the bare recitation of “two recitations ” without other modifiers  typically means at least two recitations  or two or more recitations). Furthermore  in those instances where a convention analogous to “at least one of A  B  and C  etc.” is used  in general such a construction is intended in the sense one having skill in the art would understand the convention (e.g.  “a system having at least one of A  B  and C” would include but not be limited to systems that have A alone  B alone  C alone  A and B together  A and C together  B and C together  and/or A  B  and C together  etc.). In those instances where a convention analogous to “at least one of A  B  or C  etc.” is used  in general such a construction is intended in the sense one having skill in the art would understand the convention (e.g.  “a system having at least one of A  B  or C” would include but not be limited to systems that have A alone  B alone  C alone  A and B together  A and C together  B and C together  and/or A  B  and C together  etc.). It will be further understood by those within the art that virtually any disjunctive word and/or phrase presenting two or more alternative terms  whether in the description  claims  or drawings  should be understood to contemplate the possibilities of including one of the terms  either of the terms  or both terms. For example  the phrase “A or B” will be understood to include the possibilities of “A” or “B” or “A and B.”

While various aspects and embodiments have been disclosed herein  other aspects and embodiments will be apparent to those skilled in the art. The various aspects and embodiments disclosed herein are for purposes of illustration and are not intended to be limiting  with the true scope and spirit being indicated by the following claims.

We claim:
1. A system (102) for heat dissipation in a luminaire system (101)  characterized in that:
housing (10 and 10a) comprising a plurality of cooling fins (31 and 32) is disposed on top surface of the optical and control gear compartments (103 and 104) respectively;
a plurality of LEDs (22) mounted in a predetermined manner on the angular base pads (21) of the inner surface of the housing (10);
a plurality of spines (30) disposed perpendicular to the fins (31) on the top external surface of the optical compartment (103);
wherein said spines (30) are provided at base of the light source (22) and in turn connected to the cooling fins (31);
a LED driver (24) mounted on the inner surface of the control gear compartment (104)  with the heat generating components directly touching the housing (10)  for effective heat transfer to the cooling fins (32) and to atmosphere.

2. The system (102) as claimed in claim 1  wherein the housing (10 and 10a) are made of material selected from a group comprising aluminum and its alloys.

3. The system (102) as claimed in claim 1  wherein the housing (10) is in a curved shape.

4. The system (102) as claimed in claim 1  wherein the LEDs (22) are arranged on plurality of angular pads (21) on the inner surface of the housing (10) along its length.

5. The system (102) as claimed in claim 4  wherein the angular pads (21) are characterized into central angular pads (33)  intermediate angular pads (34) placed on either side of the central angular pads (33) and outer angular pads (35) placed on either side of the intermediate angular pads (34).

6. The system (102) as claimed in claim 5  wherein the intermediate angular pads (34) are placed at an angle ranging from about 50o to about 60o and outer angular pads (35) are placed at an angle ranging from about 28o to about 38o.

7. The system (102) as claimed in claim 1  wherein a thermally conductive paste is filled in between base of the LEDs (22) and the angular pads (21) to fill air gaps for effective thermal conductivity.

8. A method of assembling a system (102) for heat dissipation in a luminaire system (101)  said method is characterized in that;
mounting plurality of LEDs (22) in predetermined manner on the angular pads (21) on inner surface of housing (10);
mounting a plurality of spines (30) over the angular pads (21) on the exterior side of the housing (10) in predetermined manner  such that said spines (30) makes contact between base of the LEDs (22) and cooling fins (31) of the housing (10) for heat transfer;
disposing plurality of cooling fins (32) in predetermined manner onto top surface of the housing (10a) of control gear compartment (104);
mounting a LED driver (24) onto inner surface of housing (10a) and heat generating components directly in contact with housing (10a)  for heat transfer from cooling fins (32) to atmosphere.