external lighting report

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9 Prussia Street Dublin 7 Ireland

T | +353 (0)1 8682000 F | +353 (0)1 8682100 W | www.ocsc.ie

External Lighting Report

22nd October 2015

Proposed Mixed Use Development

St Pauls, Raheny

Project No. N310


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N310StPaulsCollege,Raheny

EXTERNALLIGHTINGREPORT

PlanningStage

Rev02

22ndOctober2015


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N310 ExternalLightingAnalysisPlanningStageRev.02:22ndOctober2015

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CONTENTS

1.0 EXECUTIVESUMMARY2.0 DESIGNCRITERIA3.0 PROPOSEDINSTALLATIONS

4.0 RESULTS

5.0 CONCLUSION


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1.0 EXECUTIVESUMMARYThisreportoutlinesthedesignintentandconsiderationstobetakenwithregardstobatflyingpatternsandresidentiallyobtrusivelightinconjunctionwiththeproposedallweatherplayingfieldslightingschemewithintheproposeddevelopmentofStPaulsCollege,Raheny,Dublin5.ThereportconsidersthelightingdesignasdevelopedbyO ’ConnorSuttonCronin(OCSC).Thereporthasbeendevelopedwiththefollowingprincipalconsiderations:

· Topreserveresidentialamenityofneighbouringpropertiesandtheimpactoflightingonthebatsnaturalhabitat.

· Provideadequateilluminationtocontributetowardsthesafeuseofallweatherplayingfields.

·

Containthelightingwithinthesite.

· Minimiselightpollutionandvisualglaretoresidentialneighbours.

· Provideavisuallyinterestingenvironment.Thecompleteexternallighting installationwillbe designed inaccordancewiththeregulationsforelectricalservicesas ETCINationalRulesforElectrical InstallationsET101:2008aswell BatConservationIreland(BCI)guidelinesandCIBSELightingGuidePart4 – SportsLighting(2006)regardingIlluminationlevels.ThesedesigncriteriaareoutlinedinSection2.0.ThepredictedperformanceoftheexternallightinginstallationshasbeenassessedindetailusingLightingSimulationsoftware.TheLightingSimulationsoftwareusedwasDIALux;whichincludesfalsecolourrenderingcapabilities.OurdesignintentcomprisingofcolumnlightingfortheallweatherplayingfieldsinStPaulsCollegearedescribedinSection3.0.Anindicativeexampleofthetypeofproposedluminaire(lightfitting)andassociatedlampspecificationhavebeenincluded,withaccompanyingimages,photometricanddimensionaldata.Section4.0providesanalysisofthepredictedilluminationresultsfortheplayingfields(atgroundlevel).


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2.0 DESIGNCRITERIA

The designcriteriaapplied to theproposedexternal lighting installationshall be in accordancewith ETCINationalRules forElectrical Installations ET101:2008as wellas BatConservationIreland(BCI)guidelinesandCIBSELightingGuidePart4 – SportsLighting(2006). Anecological studywasconductedbyScottCawley(ecological consultants)on theStPaulssite inRaheny. Thefindingsof thereport referto batflying patternsin certainlocations aroundthesite.Thebriefofthisreportwastoalleviatetheimpactoflightingonthebatsnaturalhabitat,reducelightspillfromtheallweatherplayingfieldstopreserveneighbouringresidentialamenity&conformtoaccordancewithBatConservationIreland(BCI)guidelines.

Philipslightinghas conductedcalculationsinregard tolightlevelson thefieldsandthe residentialneighbours.To limitanyexcessivelighttrespass,whichmayimpingeupontheresidentialamenityofhousingunitstothenorth,severalpreventativemeasureshavebeentaken;1.

Firstly,endcolumnshavebeenconsciouslypositioned,soastolimitnegativespill,whilstalsomaintainingtherequiredluxlevelsuniformlyacrossthesportsarea.RepositioningofthecentraleastcolumntofacilitateaccesstoboththeCollegeHurlingWall,addedfurtherleverageinthisregard,whereinPhilipscouldthenutilisespaceengineeredthroughthisrepositioningtopositiveeffect.ThishaspositivelynegatedexcessspilllevelsacrossareascontainingthelocalBathabitat.

2. Inadditiontonortherncolumnrepositioning,narrowbeamopticsareemployedto physicallycontainunnecessarylightspillage.Thisprovisionallowsforamaximumlevelofdeliveredlighttosportsarea,asopposedtoterritoriesoutsidetheboundaryarea.

3.

Alightingaccessory intheformofcowlsmaybeinstalledwherenecessaryasapreventati vemeasureto assistinthe limitationofexcessspilllight.Byinstallingcowlswillhelp reducetheamountoflightandglareemitted,whiledirectinglightdownwardstoavoidspillage.

2.1 GUIDELINESTOEXTERNALLIGHTINGDESIGN

Asper theBatConservationIreland(BCI) guidelines& findings fromScottCawleyfrom theresite survey,the itemsbelowwererequestedto betaken intoaccount inrelation to thedesignoftheexternallighting.

1. NowhitelightorotherlightingwithaUVcomponentwillbepermittedinthevicinityoftheBathabitat;

· LightingwithlittleornoUVwillbeutilised

·

Lightingwithanarrowspectrumwillbepermittedtoreduceimpactoninsects

· LEDlightingwithabroadspectrumwillnotbeused

2. Lightingtoallowforactivitysensorsinordertoonlycomeonwhenrequired

3.

MinimumluxleveltobeusedorasrequiredbyHealth&Safetyespeciallyalongtheperimeters

4.

Lightspillagefromdoorwaysandwindowsshouldbekepttoaminimum

5. AnAmberLEDhasbeenshowntohaveareducedimpactonBatsduetoitsnarrowspectrumproperties

6.

SportFloodLighting;

· Asymmetricalbeamfloodlightsarerecommendedasopposed tosymmetrical


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· Theglassofthefloodlightsshouldbepositionedparallelwiththegroundtoensurelightiscastinadownwarddirectioninordertoavoidlightspill

· Lightinglevelsof3luxorlesswherefeasible

· Createabufferzone of50mbetween areasrequiring lightingand habitantsused bybats(e.g. thetreelinelocatedalongthe southernboundaryof theproposeddevelopment)

· Uselightingwithno/limitedUVwherepossible

Astudyon theabovecontrolswasundertaken byEmery(2008) andconcluded thatshielding andmaskingo fstreetlights canreducelightspillage byasmuch as40%.While internalandexternallouversaremoreeffective,theexternallouverscanreducelightspillagebyasmuchas97%.

· ItisimportanttomaintainDarkZonesforforagingbatsinareaswherelightingisnotnecessary.However,wherelightingisrequired,thislightingwillbeplacedataminimumheight

usingthelowestluxvaluepermittedforhealthandsafety.

· Thelightingwillbedirectionalontothebuildingsonlywithnospillageoflighttoadjoininghabitats.Toreducelightspillagefromluminaries,lightsthataredesignednottoemitlightatanglesgreaterthan70ofromtheverticalplanewillbeused.

Consequentlyaflatglassprotectorisoftenusedtoreducelightspillage.OtherMethod`stocontrollightspillage:

a) Cowls/Shields:thesecanbemountedonlampstocontroldirectionofthelight.

b)

Masking:partoftheluminariesispaintedtoblocklighttocontrolthedirectionofthelight.

c) Louvers’:eitherasinternalorexternalslatesorganizedinrowsoratanglesdependingonthedirectionoflightcontrol.

2.2 GUIDELINESTOPROPOSEDFLOODLIGHTINGDESIGN

TocomplywithCIBSELightingGuidePart4 – SportsLighting(2006)forurbanlocationsandsmalltowncentresthefollowingparametersmustbeadheredto;

a. SkyglowURL(upwardlightratio) forthefullinstallationa maximumof5%

allowed

b.

Obtrusivelight (light trespass / spill)into windows for urbanlocationsandsmalltowncentresamaximumof10luxisallowed

c.

Sourceintensityperkcd(kilocandela)amaximumof10kcdisallowed.

· Theleveloflightingproposedisdictatedbythelevelofsportscompetitionbeingengagedin.Currently,alllevelsareinexcessof250luxand0.50uniformity.Thisraisestoinexcessof300luxand0.6uniformityfortheAllWeatherSurface.

Table2.2 – CIBSELightingGuide

Part4 – SportsLighting(2006)


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3.0 PROPOSEDINSTALLATIONS3.1 AllWeatherPlayingFields

Theproposedplayingfielddevelopmentwillrequireilluminationandshallforthepurposeofthisreportcomprisealightinginstallation.Itisproposedthatthelargeallweatherplayingfieldshallaccommodate6no.18metrehighcolumnswithatotalof40no.floodlightstoachieveaminimumaverageof250lux.Thisplayingfieldshallhavebothnarrowandwidefloodlightoptics.Thesmallallweatherplayingfieldshallaccommodate4no.12metrehighcolumnswithatotalof8no.floodlightstoachieveaminimumaverageof250lux.Toassistthelightingofthesmallplayingfield,2no.18metrecolumnsshallbe utilisedtoallowfor4no.floodlightsto beinstalledon abracketat12metres.Thisplayingfieldshallhavebothnarrowfloodlight

optics.Figure3.1.1andFigure3.1.2showstheluxlevelvaluesforthelargeplayingfieldandthelightspillontheresidentialneighbours.

Figure3.1.2-GroundIlluminationLevels(Lux)forLargeAllWeatherPlayingFieldFigure3.1.1-GroundIlluminationLevels(Lux)forSmallAllWeatherPlayingField


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3.0 PROPOSEDINSTALLATIONS(cont’d)

3.1 FloodlightingColumnforAllWeatherPlayingFields

Itisproposedtoprovide18mhighcolumnfloodlighttypelightwithazerooutreachrequired.Thereshallbe2nolightfittingsproposedeachwithadifferentbeamdistributioninordertoachieveaverageluminationlevels.The proposed column light fittings are indicatively displayed in theaccompanyingimages.

ProposedLightFittingNo.1 – MVP507WB/60Theindicativeluminaireselectedwouldbe providedwith1 x2000Wattmetalhalidelamp,withalampoutputof220,000lumens.Thetypeoffloodlighthasawidebeamoptictoprovideagreaterspreadoflight.Thephotometriccurvedisplayedindicateshowthelightoutputisdirecteddownwards.

ProposedLightFittingNo.2 – MVP507NB/60Theindicativeluminaireselectedwouldbeprovidedwith1x2000Wattmetalhalidelamp,withalampoutputof220,000lumens.

Thetypeoffloodlighthasanarrowbeamoptictoprovideamoredirectlight.

The photometric curve displayed indicates how the light output isdirecteddownwards.

· PrimaryPlayingArea-4no.columnx7no.2kW/400Vfixtures-2no.columnsx6no.2kW/400Vfixtures

· SecondaryPlayingArea-6no.columns(2existingreused) – cumulatively8no.2kWfixtures

Figure3.1.2 – LuminaireMountedonColumn-Image

Figure3.1.3 – FloodlightLuminaire – PhotometricCurve

Fig3.1.1Dimensions-Light

Fittingno1

Figure3.1.5 – LuminaireMountedonColumn-Image

Figure3.1.6 – FloodlightLuminaire – PhotometricCurve

Fig3.1.4

Dimensions-LightFittingno2


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4.0 RESULTS4.1 GroundIllumination(LargeAllWeatherPlayingField)

Figure4.1.1indicatesthepredictedilluminationlevelsonGroundfortheproposedinstallations.IlluminationisindicatedusingaFalse-colourscale.

Theresultsindicate:

· Theselevelsarebasedupon18metrehighcolumnswithatotalof40no.luminairesinstalled.Theluminaireswillalsohaveazerooutreach.

· Theaverageluminancelevelachievedis340lux.

· TheOverallUnitformityUoof0.60isachieved.

Figure4.1.1 – GroundIlluminationLevels(Lux)forLargeAllWeatherPlayingField- Pseudo-ColourPlanImage


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4.2 GroundIllumination(SmallAllWeatherPlayingField)

Figure4.2.1indicatesthepredictedilluminationlevelsonGroundfortheproposedinstallations.IlluminationisindicatedusingaFalse-colourscale. Theresultsindicate:

· Theselevelsarebasedupon12metrehighcolumnswithatotalof8no.

luminairesinstalled.Theluminaireswillalsohaveazerooutreach.

· 2no.18metrecolumnsshallbeutilisedtolightboththelargeandsmallplayingfields.Thisshallallow2no.floodlightstobeinstalledonabracketat12metresoneachcolumn.

· Theaverageluminancelevelachievedis314lux.

· TheOverallUnitformityUoof0.66isachieved.

Figure4.2.1 – GroundIlluminationLevels(Lux)forSmallAllWeatherPlayingField- Pseudo-ColourPlanImage


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5.0 CONCLUSION

Thesuggestionsonlightfittingsbytheecologistweretakenintoaccountduringthedesignofthefields.UtilisinglowsodiumoramberLEDfittingswerenotsufficienttoprovidetherequiredlightinglevelsonthefields.WhilemetalhalidelightingisnotBatfriendlyitmaybedimmeddownatfeedingtimestominimisedisturbancestothehabitat.Acertainpitch/angleofthefittingswillberequiredtominimisespillage. Asshown inFigure 4.1.1 theillumination throughout thelarge AllWeather PlayingFieldmeetsthe lightingdesignrequirements;withanaverageof340lux,while thesmall PlayingFieldalsomeetsthelightingdesignrequirementsasshowninFigure4.1.2;withanaverageof314lux.Thereforetheaverage250luxfloodlightingdesignparametersetfortheplayingfieldshasbeenachieved.Thelightspillfortheeastsideofthelargeplayingfieldisbetween7.5lux – 30lux.Thelightspillforthenorthsideofthelargeplayingfieldisbetween7.5lux – 10lux.Toreducethe

lightspillPhilipshaveadvisedthatcowlscanbeusedasanaccessorytolimitanunwantedspillontotheresidentialneighbours.Asaresultofsuchusage,additionalluminairesmayberequiredtoraiseilluminancelevels – thereincompensatingforanylossoflight,asaresultofusingthisaccessory.ItshouldbenotedthattheresultsinFigure4.1.1andFigure4.2.1showthedesignintentonly.Additionallampstandardsmayberequiredduringthecourseofdetaileddesigntoensurereducedlightspillisadheredto,whileensuringluxlevelrequirementsaremaintainedthroughout.


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9 Prussia Street

Dublin 7

Ireland

T | +353 (0)1 8682000

F | +353 (0)1 8682100

W | www.ocsc.ie

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