(12) PATENT APPLICATION PUBLICATION
`(19) INDIA
`(22) Date of filing of Application :11/11/2009
`
`(21) Application No.2774/CHE/2009 A
`
`(43) Publication Date : 25/12/2009
`
`(54) Title of the invention : AN LED BASED INTELLIGENT LUMINAIRE SYSTEM FOR ILLUMINATING TARGETS SUCH
`AS BILLBOARDS AND THE LIKE
`
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`(71)Name of Applicant :
`1)MIC ELECTRONICS LIMITED
`Address of Applicant :A-4/II, ELECTRONIC COMPLEX,
`KUSHAIGUDA, HYDERABAD- 500 062 Andhra Pradesh India
`(72)Name of Inventor :
`1)RAO, MAGANTI VENKATA RAMANA
`
`(51) International classification
`(31) Priority Document No
`(32) Priority Date
`(33) Name of priority country
`(86) International Application No
`Filing Date
`(87) International Publication No
`(61) Patent of Addition to Application Number
`Filing Date
`(62) Divisional to Application Number
`Filing Date
`(57) Abstract :
`An energy efficient system for Integrated LED-based Solid State Lighting (SSL) Luminaire for Billboard Lighting Application which
`is energy conserving and environment friendly luminaire system saving about 50% of conventional energy consumption. Importantly,
`the SSL system is used in combination with improved system of optics and high power white LEDs. The light distribution of uniform
`intensity is achieved by lens design to favour the , desired uniformity of illumination over the billboard. The system is having
`intelligent micro controller based light control and intelligent on-off operation based on ambient light sensing or clock linked timing
`control based lighting. The SSL luminaire system has wide industrial application for interior lighting, recessed down lights in Film /
`TV studios, pathway lighting, high bay/Yard lighting, Billboard and high mast lighting, Facade lighting for buildings and Flood lights
`and the like with weather resistant safe mounting/housing.
`
`No. of Pages : 30 No. of Claims : 17
`
`The Patent Office Journal 25/12/2009
`
`12883
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`Page 1 of 30
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`SAMSUNG EXHIBIT 1019
`
`

`

`FIELD OF THE INVENTION
`
`The present Invention relates to a lighting luminaire and in particular to an energy efficient
`
`LED based Intelligent lighting luminalre system such as those required for lighting targets
`
`such as billboards and the like. More particularly, the Invention is directed to energy
`
`conserving and environment friendly Solid State Lighting (SSL) luminaire system deploying
`
`high brightness white LEDs adapted more specifically to illuminate uniformly targets such
`
`as huge billboards favouring saving about 50% of energy consumption involving
`
`conventional metal halide lamps with reflectors. Importantly, the LED based lumlnalre
`
`system employs specially designed optics for selective and efficient illumination of targets
`
`apart from economizing energy consumption. Advantageously, the SSL based luminaire
`
`system of the present Invention Is further adapted to favour longer operating life
`
`exceeding 15 years free of any maintenance/replacements, reduced green-house gas
`
`emissions, low voltage safe operation, low heat dissipation, with facilities for easy and
`
`selective control of Illumination Intensity avoiding light pollution and easy adaptability for
`
`solar powered solution. The Solid State LED based lumlnalre system is further optionally
`
`adapted ,or Intelligent micro controller based light control and Intelligent on-off operation
`
`based on ambient light sensing or timing control based on real time clock or astronomical
`
`clock. The LED based lumlnaire system of the present invention Is thus having wide
`
`prospects for Industrial production and application in a varied range of uses comprising
`
`both Indoor and out door lighting such as for Interior lighting/recessed down lights In film/
`
`TV production, pathway lighting, high bay/Yard lighting, facade lighting for buildings and
`
`the flood lights and the like adapted for weather resistant mounting In a safe manner
`
`ensuring uniform illumination with minimal light trespass.
`
`BACKGROUND ART
`
`It iS well known in the art of advertising and signage that the Vinyl Billboards of huge size
`
`such as 14 ftx 48 ft are usually used to convey commercial messages through text as
`
`well as Images- static or dynamic-displayed by illumination. Such billboards are put up on
`
`rooftops and towers specially erected to hold them at suitable height to attract attention of
`
`trespassers, ensuring an Impact on visibility either in daylight or at night. This Is why
`
`billboard lighting assume importance. Lumlnaires of adequate power rating are used to
`
`illuminate the billboard uniformly creating the desired Impact on viewers.
`
`2
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`It is also experienced in the existing art of display of contents on billboards, usually metal
`
`halide lamps with reflectors are used having usual rating of 400w which distributes the
`
`light uniformly on the board. In the existing practice, usually four such luminaires are
`
`needed to illuminate a standard 14 ft x 48 ft billboard. Improvements in the luminaires
`
`systems by way of optics together with efficient integral ballast, the requirements were
`
`reduced to only two such luminaires of 400w to illuminate the billboard for sufficiency of
`
`viewing by target audience. However, the conventional billboard lighting systems suffer
`
`from a number of limitations apart from being high energy intensive, that needed to be
`
`appropriately addressed. The grid-based luminaires need significant power consumption
`
`and accompany related costs/tariff. Also the problem Is aggravated during crisis/shortage
`
`of grid power. Thus low cost low power consuming illumination systems with equivalent or
`
`higher Intensity of illumination appear essential. The prior art lumlnaires are primarily high
`
`intensity discharge lamps operating on high supply voltages wherein the light source
`
`produce light by establishing an electric arc through a gas mixture which need an Initial
`
`time to start due to the ballast. There has therefore been a need In the art to generate
`
`improved design configuration of such high intensity metal halide based lamps to eliminate
`
`ballast and hence reducing the Initial time to start. It is also observed in the art that the
`
`existing ballast designs are prone to frequent breakdowns or burnouts necessitating
`
`maintenance and replacement of the lamp.
`
`The luminaires of the prior art are essentially sources of significant amounts of greenhouse
`
`gas emissions due to dependency on the grid power, resulting In environmental pollution.
`
`Such luminaires are also essentially omnl directional giving away light in almost all 360°
`
`around. Use of such luminaires for directed lighting applications like the billboard lighting
`
`call for provisioning of reflectors to focus only on the desired size of the target billboard
`
`and avoid spillover beyond the edges. The conventional lumlnalres are moreover, manually
`
`operated for switching on/off resulting in considerable misuse of grid power.
`
`There has been thus a continuing need in the art to develop Illuminating systems that
`
`would consume less power and also have reduced/no ballast requirement favoring faster
`
`response and also means for automatic on/off operation using Intelligent and interactive
`
`systems facilitating operations automatically with associated power savings.
`
`3
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`Page 3 of 30
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`

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`OBJECTS OF THE INVENTION
`
`It is thus the basic object of the present Invention to provide a Solid State Lighting (SSL)
`
`solution or a green energy solution in the form of an LED based luminaire system adapted
`
`to energy efficient and environment friendly operation for various target lighting purposes
`
`including billboard lighting or the like application with longer operating life in a safe,
`
`reliable, energy efficient and cost effective manner providing uniform Illumination at all
`
`points on the display panel, consuming approximately half the power consumption as
`
`compared to the conventional fluorescent, metal halide or other high-Intensity discharge
`
`lamps presently used as lighting means.
`
`A further object of the present Invention directed to SSL based lumlnaire system for the
`
`billboard lighting and other indoor and outdoor applications wherein the use of solid state
`
`semiconductor based technology would provide for an effective alternative to the known
`
`use of metal halides and its emission related problems and would thus be further
`
`environment friendly.
`
`A still further object of the present invention directed to SSL based lumlnalre systems for
`the Indoor as well as outdoor applications that can be adapted to be automatically
`
`activated using Intelligent and Interactive systems facilitating operations automatically with
`
`associated power savings.
`
`A still further object of the present invention directed to SSL based lumlnaire systems for
`
`the Indoor as well as outdoor applications Including that for billboard lighting purpose
`adapted to use SSL based lighting systems such that the ballast requirements and flickers
`
`are eliminated providing advantageous fast response time and ensuring silent operation
`
`without burnout problems.
`
`A still further object of the present Invention directed to SSL based luminaire systems for
`
`the Indoor as well as outdoor applications including that for billboard lighting which would
`
`ensure uniform illumination on the billboard and the like targets with less number of
`
`luminalres with equivalent Intensity at 50% less power consumption.
`
`4
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`A still further object of the present Invention directed to SSL based luminaJre systems for
`
`the indoor as well as outdoor applications including that for billboard lighting wherein the
`
`lighting could be achieved avoiding light pollution.
`
`A still further object of the present Invention directed to SSL based luminaire systems for
`
`the indoor as well as outdoor applications Including that for billboard lighting wherein less
`
`number of luminaires consuming less power would be sufficient to Illuminate a standard
`
`bill board with desired intensity uniformly on the board.
`
`A still further object of the present Invention directed to SSL based lumlnaire systems for
`
`the Indoor as well as outdoor applications including that for billboard lighting wherein said
`
`LED based solid state lighting devices are adapted for operating life exceeding 15 years
`
`(more than 50,000 hrs) free of any maintenance or replacements.
`
`A still further object of the present Invention directed to SSL based lumlnalre systems for
`
`the indoor as well as outdoor applications including that for billboard lighting wherein
`
`constant light output is ensured over the entire life time of the lumlnalre favouring
`
`substantial energy saving.
`
`A still further object of the present invention directed to SSL based luminaire systems for
`
`the indoor as well as outdoor applications Including that for billboard lighting wherein said
`
`lumJnalres are mounted at bottom or top at normal plane to the vertical board favouring a
`
`minimum light trespass.
`
`A still further object of the present invention directed to SSL based luminaire systems for
`
`the Indoor as well as outdoor applications Including that for billboard lighting wherein said
`
`lumJnaires are adapted for outdoor application in rugged and wet environmental conditions
`
`mounted in housing that is adapted for Ingress protection with IP66.
`
`A still further object of the present invention directed to SSL based luminaire systems for
`
`the indoor as well as outdoor applications Including that for billboard lighting wherein the
`
`design of optics ensures the light distribution pattern from the light source and the manner
`
`and pattern in which the light is distributed in order to maximize the light on board and/or
`
`favour the light utilization factor.
`
`Page 5 of 30
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`

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`A still further object of the present invention directed to SSL based luminaire systems for
`
`the indoor as well as outdoor applications Including that for billboard lighting wherein the
`
`Light distribution from the SSL based luminaries are adapted for selective distribution of
`
`the strength of illumination on the target object thereby providing a new and cost-effective
`
`illumination means for variety of illumination purposes.
`
`A still further object of the present invention directed to SSL based lumlnalre systems for
`
`the Indoor as well as outdoor applications including that for billboard lighting Involving an
`
`aesthetically designed housing for the mounting of the lumlnaJres having thermal
`
`management taking into consideration the heat transfer from within the enclosure to
`
`outside, ensuring maintaining safe operating temperature to favour useful hours of life for
`
`the LEDs without degradation of Intensity of the light emitted.
`
`A still further object of the present invention directed to SSL based luminaire systems for
`
`the Indoor as well as outdoor applications Including that for billboard lighting wherein said
`
`LED baseJ solid state systems are adapted for microprocessor based intelligent control
`
`and an intelligent on/off operation based on ambient light sensing or timing control based
`
`on real time clock or astronomical clock for achieving further energy savings.
`
`A still further object of the present Invention directed to SSL based luminalre systems for
`
`the indoor as well as outdoor applications including that for billboard lighting involving
`
`microprocessor based Intelligent control for energy efficient uniform Illumination of desired
`
`intensity which would be adapted to be networked and programmable.
`
`A still further object of the present Invention directed to SSL based luminaire systems for
`
`the Indoor as well as outdoor applications Including that for billboard lighting wherein said
`
`system Is adapted to protect the lighting system from adverse weather conditions
`
`ensuring IP66 Ingress protection.
`
`SUMMARY OF THE INVENTION
`
`Thus according to the basic aspect of the present Invention there Is provided
`
`an energy
`
`efficient lED based Intelligent lighting luminaire system comprising:
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`Page 6 of 30
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`plurality of LEDs sourcing light of desired specifications and power depending upon
`
`the shape and size of the target to be illuminated housed within a housing; and
`
`optical lens system cooperatively disposed with respect to said LEDs sourcing
`
`unidirectional light to thereby produce for desired selective illumination on the
`
`target to be lit up.
`
`Another aspect of the present invention is directed to an energy efficient LED based
`
`intelligent billboard lighting luminaire system comprising:
`
`plurality of LEDs sourcing light of desired specifications and power depending upon
`
`the shape and size of the billboard to be uniformly lit housed within a housing; and
`
`optical lens system cooperatively disposed with respect to said LEDs sourcing
`
`unidirectional light to thereby produce for desired uniform illumination pattern on
`
`the target billboard.
`
`A further aspect of the present Invention Is directed to an energy efficient Intelligent
`
`billboard lighting luminaire system wherein s(cid:127)ld optical system comprises lens means
`
`adapted to achieve said desired Illumination pattern.
`
`A still further aspect of the present Invention Is directed to an energy efficient Intelligent
`
`lighting lumlnalre system wherein for billboard lighting said lens means is adapted such as
`
`to achieve desired uniform light distribution pattern from the LED light sources and
`
`improve the same in order to maximize the light on the board and reduce the light
`
`pollution and increase light utilization factor.
`
`A still further aspect of the present Invention is directed to meeting IES r((cid:127)commendatlons
`
`for billboard lighting applications for dark surroundings in respect of Lux levels and
`
`uniformity ratio - the ratio of lux levels at the centre (max) to periphery (mln). The IES
`
`recommendations suggest the following lux levels for different surfaces to be illuminated;
`
`7
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`Matte surfaces 1000 (bright) and 500 (dark surrounds)
`
`Glossy surfaces 500 (bright) and 200 (dark surrounds)
`
`and a uniformity ratio of 4:1 or better.
`
`A still further aspect of the present Invention is directed to an energy efficient intelligent
`
`lighting luminaire system wherein for uniform billboard lighting the light distribution from
`
`the LEDs Is modified by means of the lens system to be completely asymmetric in order to
`
`achieve the desired uniformity.
`
`A still further aspect of the present invention is directed to an energy efficient intelligent
`
`lighting luminaire system wherein satd arrangement of lenses comprises providing lens
`
`arrangement adapted to achieve the desired candela distribution such that the candela of
`
`the light from LED sources at low vertical angles which Is more, can be folded into higher
`
`vertical angle zones by total Internal reflection thereby increasing the candela In higher
`
`vertical angle zones for achieving the desired uniformity In lighting of the target billboard
`
`placed perpendicular to the light sources.
`
`According to an aspect of the Invention the energy efficient LED based Intelligent lighting
`
`luminaire system Involves said optical lens system comprising a lens means adapted to
`
`provide for refraction and total Internal reflection to achieve desired Illumination on the
`
`hoarding.
`
`A further aspect of the invention provides the energy efficient LED based Intelligent
`
`lighting luminalre system wherein said optical lens comprises of a bottom surface and two
`
`free form surfaces one for refraction of the light rays and other for total internal reflection
`
`of light rays and includes inner space in the lens body and Is asymmetrical around the
`
`center axis, said inner space having free-form shape such that light from the LED source Is
`
`divided in to two parts, one part Is refracted directly from the Inner surface and the other
`
`part undergoes total internal reflection at the side free-form surface and thus adapted to
`
`provide for the required Illumination and concentration of light from refractive surface.
`
`Yet another aspect of the invention is directed to an energy efficient LED based intelligent
`
`lighting lumlnaire system wherein the said refractive free-form surface extends from top of
`
`the lens to the side which Is facing the hoarding, said free-form refractive surface adapted
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`to provide refraction of light rays from the inner space and the light rays reflected by total
`
`internal reflection from the side face free-form surface, the said refractive surface having
`
`two free-from segments, one for refracting the light rays from the inner space and other
`
`for refracting light rays which are reflected by total internal reflection from the side
`
`surface.
`
`A further aspect of the invention provides for an energy efficient LED based intelligent
`
`lighting luminalre system wherein said lens system basically comprises of two Integrally
`
`formed units (i) left unit and (Ji) right unit facing the hoarding, the left unit comprising of
`
`one half of the inner space, side free-form surface for total Internal reflection of light from
`
`the Inner space and a refracting free-form surface segment to refract light from the side
`
`free-form surface, the right unit incorporating other half of the inner space and another
`
`refracting free form surface segment.
`
`In accordance with a preferred aspect of the invention in the said energy efficient LED
`
`based Intelligent lighting luminaire system the said lens system is obtained of
`
`polycarbonate / PMMA material.
`
`A still further aspect of the present invention Is directed to an energy efficient Intelligent
`
`lighting luminaire system wherein said housing is, sturdy and aerodynamically designed for
`
`withstanding outside conditions and wind pressure and is provided with requh’ed
`
`ventilation for dissipating the heat generated.
`
`According to (cid:127)et another aspect of the present invention directed to an energy efficient
`
`intelligent lighting luminaire system comprising:
`
`microcontroller based Input light control and Intelligent ON-OFF operation based on
`
`ambient light sensing and/or timing control.
`
`A still further aspect of the present Invention is directed to an energy efficient intelligent
`
`lighting luminaire system comprising high brightness white LED.
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`A still further aspect of the present invention is dlrected to an energy efficient intelllgent
`
`lighting lurnlnalre system comprlslng:
`
`a power source operatively connected to an LED drive circuit,
`
`said LED drive circuit electronics operatively connected to the said LED light source
`
`assembly;
`
`said optical lens system cooperatively disposed with respect to the LED sources for said
`
`deslred lllumination of the target;
`
`an auxiliary power source adapted to support light control electronics which Is adapted to
`
`be activated based on signals received from the light source assembly for over-
`
`temperature protection, light sensor and /or any external Interface units adapted for
`
`ON/OFF or dimming control of the luminaires.
`
`A still further aspect of the present invention is directed to an energy efficient Intelligent
`
`llghtlng lurnlnalre system whereln sald power source comprlses AC mains power from the
`
`grld, means to convert the same to DC to power sald LED drlve; and
`
`means for constantly monltoring for hlgh and low level vlolatlons to cut-off AC power In
`
`such sltuations to safeguard the lumlnalres.
`
`The present invention and its objects and advantages are described in greater details with
`
`reference to the following accompanying non limiting illustrative figures.
`
`BRIEF DESCRIPTION OF THE ACCOMPANYING FIGURES
`
`Figure 1: is the schematic Illustration of the SS Billboard lighting Lumlnalre system
`
`according to the present Invention showing the different units in the system and their
`
`relations by means of a block diagram.
`
`Figure 2: is the schematic diagram of the billboard lighting using SSL system of the
`
`invention showing the distribution scheme oF light beams at various locations on the
`
`standard 14 ft x 24 ft area of board for desired uniform illumination.
`
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`Figure 3" is the schematic Illustration of the performance of the improved optics
`
`configuration for the SSL luminalres for desired uniform intensity of illumination wherein
`
`more intensified light beam emerges from the luminaires at higher vertical angles and vice
`
`versa, as schematically shown in the estimated relative candela polar diagram.
`
`Figure 4a: is the schematic Illustration of the candela polar diagram for SSL system
`
`without lens,
`
`Figure 4b" is the polar diagram with lens for favoured polar candela distribution required
`
`for the uniform high Intensity light emitting from the luminaires and incident on board.
`
`Figure 4c: is the schematic Illustration of the Iso-candela plot of the luminescence over
`
`the billboard lit with SSL system according to the present Invention to evaluate the bill
`
`board lighting uniformity using photometrics.
`
`Figure 5: is the schematic illustration of the housing of the SSL luminaires showing the
`
`nature of light distribution direction without requiring tilting of the luminaire/LED PCB,
`
`Figure 6: is the image of the LED based luminaire for use in the SSL system for billboard
`
`lighting according to the present invention showing in its three views.
`
`Figure 7" Is the schematic illustration of the disposition of the single unit SSL lumlnaire
`
`system according to an embodiment of the Invention for lighting of the standard 14ft x 24
`
`ft billboard and the preferred disposition and spacing of said single SSL luminaire with
`
`respect to the bill board at right angles to each other.
`
`Figure 8: Is the schematic Illustration of the lens configuration of the SSL luminaire
`
`system of the invention, showing its different portions having free forms on top and side
`
`face enabling directing high Intensity light beams for desired uniform intensity of
`
`illumination on the bill board, either by direct refraction through one part and internal total
`
`reflection through another aart of the lens.
`
`Figure 9: is the schematic Illustration of side view of distribution pattern of the refracted
`
`light beam emerging from the SSL based luminaires through the selective lens
`
`configuration wherein some light beams are directed by simple refraction through one part
`
`11
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`of the lens of each Chip-LED module and some low angle light beams are subjected to
`
`total internal reflection to direct the beams to higher vertical angles for desired uniform
`
`illumination of the billboard.
`
`Figure 10 a & b" is the schematic II’ustration of the front view(a) and the top view(b) of
`
`the lens assembly of the SSL based billboard lighting lumlnalres device according to the
`
`present invention directed to illuminate the bill board uniformly.
`
`Figure 11; is the Image of the SSL luminaire unit according to the Invention comprising
`
`plurality of LEDs selectively disposed in an array.
`
`DETAILED DESCRIPTION OF THE INVENTION WITH REFERENCE TO THE
`ACCOMPANYING FIGURES
`
`The Invention discussed hereinbefore thus relates to Solid State LED based lumlnalres for
`
`target lighting such as bill board lighting and other applications adapted for intelligent
`
`automatically controlled Illumination of uniform intensity across the board. Importantly,
`
`the lumlnaire system of the Invention also Involves advantageous use of electronic control
`
`of on/off operation as well as ambient light sensitive control of illumination that can further
`
`be enhanced for reliable performance and energy efficiency by incorporation of
`
`microprocessor based lighting control and adaptability to be networked as well as
`
`programmable. The LED based lumlnaire system apart from being cost-effective by way of
`
`selective involvement of optics with LED light sources advantageously enable control on
`
`light beam direction and distribution for variety of possible modulations of illumination of
`
`targets including the required uniform illumination of desired intensity with longer
`
`operating life of such SSL luminaire systems for billboards and the like free of any
`
`maintenance or replacement.
`
`Reference is first invited to the accompanying Figure 1 that schematically illustrates SSL
`
`lighting system according to the present invention showing the different units in the
`
`system and their functional relationship by means of a block diagram. The functional
`
`realization of the luminaire is achieved through various elements as shown schematically
`
`in the block diagram of Figure 1. The luminaire receives AC power from the grid (11),
`
`which is converted to DC (12) such as by a solid state rectifier un!t to power constant
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`current driving of the LED drive electronics (15) and the LED light source assembly (16).
`
`Optics (17) deals with the arrangement of lenses to achieve desired illumination pattern on
`
`the target billboard. The mains input is constantly monitored for high and low level
`
`violations to c(cid:127)t-off AC power (13) under such situations to safeguard the luminaire.
`
`Auxiliary power (14) is derived to support the light control electronics (18) which gets
`
`activated on receiving appropriate signals from the light source assembly (16) for over-
`temperature protection, light sensor (20) and/or any external interface units (21) like RF
`
`etc. for On/Off operation or dimming control of the luminaire.
`
`According to an advantageous aspect of the Invention the illumination per unit of energy
`
`input is further Improved and the Intensity of illumination is uniformly maintained all over
`
`the billboard by adopting an improved optics configuration for the SSL device with
`
`housing. reference Is now invited to the accompanying Figure :2, showing schematically
`
`the distribution scheme of light beams at various locations on the standard 14 ft x 24 ft
`
`area of board for desired uniform illumination using the energy efficient SSL lumlnalre
`
`system of the present Invention. The purpose of the optics is to modify the light output of
`
`the LEDs to achieve desired levels of illumination pattern on the target surface. The design
`
`configuration of optics essentially deals with the distribution of the light beams/pattern
`
`from the light source and the manner in which this pattern can be imprcved in order to
`
`maximize the light on the board, reduce the light pollution such as the light trespass or’
`
`sky glow and consequently increase the light utilization factor. The optics design thus
`
`ensures an acceptable level of uniformity of illumination on the board rearranging for the
`
`light to be more on to the top/bottom edges as well as to the sides of the entire stretch of
`
`the billboard. Since the optics is Intended to project the light beams evenly on the board at
`
`a height of about 4 -5 times the mounting distance, it may be noticed that the distance
`
`light travels is minimum for area ’1’ and is higher for the higher numbered areas as shown
`
`in the accompanying Figure 2. It Is thus required that the luminalre is configured to project
`
`high intensity light (higher candel8) beam towards the higher numbered areas e.g. 4,5,6
`
`etc. as compared to the intensity of light beam projected to areas 1,2,3 etc. as illustrated
`
`in the accompanying Figure 2. The need for rr, odification of light distribution from the LED
`
`based luminaire is thus accomplished by appropriate optics design involving lenses of
`
`physical characteristic parameters which is completely asymmetric as laid over the LED/
`
`luminaire housing in order to achieve desired uniformity of illumination of equal intensity
`
`all over the board.
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`It is also an important aspect of the present Invention that to achieve uniformity of the
`
`illumination on the board, the requirement is that the more Intensified light beam must
`
`emerge from luminaire at higher vertical angles I.e. candela of the lamp should be more
`
`and vice versa. Accordingly, relative candela polar diagram can be estimated as shown in
`
`the accompanying Figure 3.
`
`In order to achieve desired candela distribution, appropriate lens design for the SSL
`
`luminaire system is essential. Since the candela of the LED lamp at low vertical angles Is
`
`more, light beams are folded into high vertical angle zone by adopting total Internal
`
`reflection by suitable lens design and thereby increasing the candela there relatively. Lens
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`design also enable no tilt angle of the luminaire. The luminalre Is mounted horizontally
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`such that its plane Is perpendicular to the board.
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`The mechanical design of the metallic housing for the SSL lumlnalre system Is made of
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`aluminium alloy die casting with aesthetically good appearance that also takes into
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`consideration the heat transfer from within the enclosure to the outside. Insufficient
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`ventilation can raise the ambient temperature within the enclosure and adversely affect
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`the LED characteristics and useful hours of life beyond which degradation in the Intensity
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`of the light emitted is expected to occur. The housing Is sturdy and aerodynamically
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`designed to withstand wind pressure and also ingress protected with IP66.
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`Attention is now invited to the accompanying Figure 4a wherein the candela polar
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`diagram has been illustrated showing the uniform distribution of light beam all around
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`360° of equal Intensity without any provision of lens In the luminaire/LED lamps; The
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`accompanying Figure 4b on the otherhand shows the candela polar diagram for the light
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`beam distribution when appropriate lens design is provided in the SSL luminaire as of the
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`present Invention such that the more of the low angle light beams from LEDs are folded
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`into high vertical angle zone using the principle of total Internal reflection of optics adopted
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`through appropriately configured lens and their desired disposition on the
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`luminaires/housing.
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`Accompanying Figure 4(cid:128) Is the schematic illustration of the iso-candela plot of the
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`Illumination at various locations on the billboard lit with SSL luminaire using photometrics,
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`The degrees in the said iso-candela plot represent the angular positions of the billboard to
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`designate the respective area selected for carrying out measurement of illumination. It is
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`also apparent from each of the said iso-candela plots having the indication of % of
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`maximum illumination (8549 Cd) and also the magnitude available/obtained along each
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`such plot.
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`Reference is now invited to the accompanying Figure 5 that schematically il