Brighter Pupils - THORN Lighting

Brighter Pupils - THORN Lighting

Energy EfficiencyLighting accounts for a significant part of anyschools energy use, as much as 25%.aYet useof simple lighting controls and modern efficientluminaires can lead to a substantial reduction.We know that most peopleprefer to work in daylight, andeducation is no different. Asdesigners of artificial lightingThorn are committed to usingtechnology to improve theefficacy of our luminaires andsimple, functional and reliablecontrols to turn off our productswhen they are not needed.Our most modern luminairedesigns achieve efficacy wellin advance of legislation, infact we aim to beat legislationtargets such as those set inthe Building Regulations by10-15%, and already we arerevisiting luminaire designs forthe next update to the BuildingRegulations. We understandthat users often forget toturn off lighting when it’s notrequired, but with absencecontrol building owners canmaximise savings when theirspaces are empty. Addedto this daylight controls canswitch or dim luminaireswhere daylight is sufficient.Research which we startedin the 1980’s based aroundour innovative Sensa rangeof intelligent luminaires hasshown near windows this canbe as high as 70%. Of courselighting controls are onlyeffective if they are understoodand so we offer solutionsfrom the very complex to themost simple, all of which areintuitive for the teacher, pupiland maintenance staff.Cost of Energy (£/year)Classroom Annual Energy Costs (9p/kWh)3000002500002000001500001000005000000 3 6 9 12 15 18 21 24Number of classroomsTypical Classroom Energy Cost1600014000KeyKey9 Fittings,2x40W T129 Fittings,1x35W T59 Fittings,1x35W T5,Dalylight controlto Window row16p/KWh14p/KWh11p/KWh9p/KWh7p/KWhTable 1Classroom AnnualEnergy Costs.Energy savings start tobuild when you considerthe number of classroomsand the difference betweenold and new lightingtechnologies. Here thecomparison between1970’s classrooms andthose of today (with andwithout daylight controlsclearly shows significantcost savings are available.(Based on a typical1970 classroom lightinginstallation of 9 fittingseach with 2x40W T12lamps and Switch Startgear compared to a typical2009 classroom of 9 fittingseach of 1x35W T5(T16)lamps, and finally the samemodern classroom withthe luminaires nearest thewindows dimming withdaylight. Maintenancebased on 16000 hours,2480 hours use per annumwith varying switching levelsbased on time of day.12000Cost of Energy (£/pa)10000800060004000200000 3 6 9 12 15 18 21 24Number of classroomsTable 2Typical Classroom energycosts assuming typicalprices forecast for the nextdecade. This comparisonshows how much theenergy price for a groupsof classrooms will varyas base energy pricesfluctuate in the comingyears. DEFRA predict risesin Retail Electricity pricesfor commercial users ofbetween 3% and 200%.Retail prices betweenQuarter 1 in 2008 and2009 rose by 22.7% inreal terms.10 11

Lighting the classroomWithout doubt all learning should be donein daylight, but when the evening or winterapproaches good quality artificial light is vital.Typical 9 luminaire classroom with whiteboard luminaire and window row dimming. Includes Absence control.To maximise efficiency all teaching spaces must use daylight as aprimary source and dim the artificial light accordingly, initially justluminaires by the windows, but preferably though-out the whole room.Increased use of interactivewhiteboards and projectorsmeans the teacher needs goodcontrol of the blinds and artificiallighting. Complexity of controlhas been proved to give longterm problems so local andeffective lighting controls mustbe provided that are simple toinstall, understand, maintain andoperate, give flexibility of useand energy savings, and allowfor changes in the use of a roomto give true sustainability.Specific requirements mayrequire task lighting (i.e. theneed to specifically light the taskrather than creating high overallambient lighting levels) andwhere possible an ambient andtask approach is preferred.14 15

SuccessesSouthwell’s Minster SchoolSouthwell’s Minster Schoolspecialises in music andhumanities, but it is not just avenue for lectures, studying andsocialising - it has a sharedtheatre, recital room, main hall,café and sports hall, and thesefacilities are shared with the localcommunity. The central covered‘street’ is lit by triple clusters ofsurface downlights and rowsof dimmable fluorescent. Thelighting is pleasantly subduedwith no glare and supplementsthe skylights. In the classroomslighting is controlled by aSensaLink system. Recessedmounted presence detectorsaddress groups of digitallyenabled luminaires, controlledfrom local two button wall plates.Staff can adjust the lightingto suit the conditions, and thesystem switches the lights offwhen they leave. The result is anew generation of educationalbuilding, and an extremelypleasant environment in which tostudy and play.SuccessesLeeds Schools PFIJohn Smeaton Community Collegestarted out with an expectationthat their students should haveschool where they can feel happy,safe and understood. The schoolhas set out to create a learningenvironment that enhances this.The College luminaires lightingthe corridors, craft classrooms andperformance spaces go a longway to creating a light modernspace with good facial modelling.This allows students and staffto correctly read and interpretbody language, vital for betterunderstanding. High frequencylighting improves performanceefficiency and comfort, minimisingeye strain and headaches andimproving safety by removingstroboscopic effects on fast movingmachinery. Moving to the exteriorthe security lighting has beencarefully designed to illuminate thepremises, but not at the expenseof the environment. Luminaireswith zero cut-off limit the upwardlight and reduce to a minimumthe effects of light nuisance to thesurrounding community.1617

Lighting for people or computersThe designer and specifier should not beover concerned about lighting for displayscreen equipment.Old versus new screen technology, nowadays glare from luminaires is rarely a problemThe designer and specifiershould not be over concernedabout lighting for displayscreen equipment. Thoughundoubtedly the use of computersis increasing these are consideredby many teachers to be anaid to learning rather than aconstantly used replacement forhuman interaction. In spaceswhere laptops are used simpleorientation of the screen, controlof daylight glare and commonsense optical control in luminairesis sufficient to reduce the impactof reflections in screens.Modern screen technology caneasily handle high luminance wellbeyond that covered by someoutdated legislation; levels nearer3000cd/m 2 are reasonable limitsfor modern lighting, software andscreen equipment.Lighting for computer screensshould not impinge on lightingfor effective teacher - pupilcommunication, specular(polished) louvred fittings arenot required even in dedicatedcomputer suites and their useshould be restricted, with satinrather than full mirrored louvresbeing used to enliven thespace if needed. Modern microprism optics and luminairesthat combine lit coffers or aresuspended with an element ofupward light give much morecomfortable, balanced spaces.The choice of the light sourcesalso affects the appearanceof the space, lamps with goodcolour rendering (with a colourrendering in excess of Ra80)enable the eye to interpret realcolour differences, importantthrough-out but particularly soin art, food and design areas.Choice of colour temperature willimpact the warmth of a spaceand it is recommended that alllight sources should be between2000-4000K.Harsh louvred solutions create acave effectModern recessed luminaires createthe impression of a lit ceilingThe ideal solution of direct/indirect luminairesPoor colour rendering on the left versus modern good colour renderingon the right, look at the reds, blues yellows to see the difference.Warm colour temperature(2700K)Cool colour temperature (4000K)18 19

Performance requirementsEducational premises as EN12464-1.Table 1: Educational premises1 Nursery school, play of interior, task oractivityÉm UGRL Uo Ra Remarks1.1 Handicraft room 300 19 0.4 801.2 Nursery 300 19 0.4 801.3 Play room 300 19 0.6 802 Educational of interior, task oractivityÉm UGRL Uo Ra Remarks2.1 Classrooms, tutorial rooms 300 19 0.6 80 Lighting should be controllable. Illuminances on the wallshould be 50% of the task area illuminance or Evmin= 100lux and on the ceiling should be 30% of the taskilluminance or Ehmin = 50lux2.2 Classroom for evening classes andadults education500 19 0.6 80 Lighting should be controllable. Illuminances on the wallshould be 50% of the task area illuminance or Evmin= 100lux and on the ceiling should be 30% of the taskilluminance or Ehmin = 50lux2.3 Auditorium, lecture halls 500 19 0.6 80 Lighting should be controllable to suit various audio visualneeds2.4. Black, green and white boards 500 19 0.7 80 Prevent veiling reflections.The teacher should be illuminated with suitable verticalilluminance2.5 Demonstration table 500 19 0.7 80 In lecture halls 750 lx.2.6 Art rooms 500 19 0.6 802.7 Art rooms in specialist art schools 750 19 0.7 90 Colour temperature ≥ 5000°K.2.8 Technical drawing rooms 750 16 0.7 802.9 Practical rooms and laboratories 500 19 0.6 802.10 Handicraft rooms 500 19 0.6 802.11 Teaching workshop 500 19 0.6 802.12 Music practice rooms 300 19 0.6 802.13 Computer practice rooms (menudriven)300 19 0.6 80 Artificial and natural lighting should comply with theguidance in Lighting Guide 72.14 Language laboratory 300 19 0.6 802.15 Preparation rooms and workshops 500 22 0.6 802.16 Entrance halls 200 22 0.4 802.17 Circulation areas, corridors 100 25 0.4 802.18 Stairs 150 25 0.4 802.19 Student common rooms andassembly halls200 22 0.4 802.20 Staff rooms 300 19 0.6 802.21 Library: bookshelves 200 19 0.6 802.22 Library: reading areas 500 19 0.6 802.23 Stock rooms for teaching materials 100 25 0.4 802.24 Sports halls, gymnasiums, swimmingpools300 22 0.6 80 Sports Lighting performance requirments are detailed inBS EN 121932.25 School canteens 200 22 0.4 802.26 Kitchen 500 22 0.6 80 Certain tasks within a kitchen may be classed as high risktasks for emergency lighting20

More magazines by this user
Similar magazines