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    TASK AREA

    CONCEPTS

    New task-area

    related lighting con-

    cepts in accordance

    with EN 12464 for

    higher quality, greaterflexibility and impro-

    ved efficiency.

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    Office work is uncommonly

    varied. Communicating with

    your team, advising customers,

    reading documents, writing

    bids on your PC or by hand on

    paper each of these activities

    places different requirements

    on room lighting. Trend-settinglighting solutions focus on the

    diversity of activities and the

    corresponding specific visual

    tasks. Criteria such as reducing

    glare and reflections, shadow,

    detail and brightness distribution

    play just as important a role as

    fostering a lively atmosphere

    and cutting operating and main-

    tenance costs. A wide variety

    of needs can be encountered in

    a single building or even on a

    single storey. Concepts that aregeared towards needs focus light

    on individual areas and, hence,

    particular visual tasks. The TASK

    AREA concept goes one step

    further. It exploits the freedom

    given within the latest lighting

    design recommendations in

    such a way that vertically illumi-

    nated planes are considered in

    addition to traditionally used

    horizontal ones, while also inclu-

    ding aspects of dynamism, utili-

    sing intelligent lighting controls.According to Zumtobel Staf fs

    TASK AREA concept, the room,

    luminaire and lighting manage-

    ment system are seen as an

    integrated whole. If buildings are

    planned in a holistic way and

    planning to requirements is

    carried out in detail, there is

    every likelihood that this will

    result in lighting installations

    related to task areas and their

    associated visual tasks, also

    taking factors such as con-venience, flexibility, economic

    efficiency and creative design

    into account.

    More appropriate lighting quality

    Reduced energy consumption

    Scope for aesthetically pleasing

    environmental design

    The emphasis using

    TASK AREA concepts:

    L I G H T F O C U S E D O N V I S U A L T A S K S 3

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    Trend-setting lighting technology

    must aim to create opt imum

    working conditions on the one

    hand and visual experienceson the other hand in order to

    make staf f members feel good

    in thei r working envi ronment.

    The Licht und Mensch [Light and

    People] study by the German Insti-

    tute for Applied Lighting Engineering

    (Deutsches Institut fr Angewandte

    Lichttechnik [DIAL]) confirms the

    considerable potential offered by

    multidimensional lighting to improve

    working and living conditions.

    More convenience

    The focusing of light provides

    creative and financial freedom

    to make investments in conve-

    nience and dynamism. The right

    light for specific visual tasks is

    but one of the many aspects

    involved in optimum lighting

    solutions. Vertical lighting and

    accents in the room enhance

    users sense of well-being.

    Setting goals,meeting requirements

    Designing a lighting system

    according to the areas in which

    visual tasks are performed

    opens up additional flexibility.

    The more precisely a TASK

    AREA can be defined, the

    more accurately the amount

    and quality of the lighting

    can be adjusted. This also

    provides greater flexibility for

    implementing outstanding

    lighting solutions.

    More quality

    TASK AREA concepts are based

    on specific lighting tasks. The

    right quantity of light, in the

    optimum quality, is provided at

    the visual task area. Uniformity,

    reduction of glare and reflec-

    tions, contrast rendition and

    shadow detail are adjusted to

    the respective task. The lighting

    is not matched just to the room,

    but to what users need.

    Room-related lighting concepts are

    based neither on task areas nor on

    different visual tasks. The lighting is

    designed for the most demanding

    task to be performed in the room.

    The position of the workstation is

    not defined; an accordingly high

    lighting quality is provided for the

    entire room.

    120

    100

    80

    60

    40

    20

    0

    Proportion of task area in total area in %

    Energyconsumptionin%

    100 90 80 70 60 50

    Optimum energy efficiency

    There is huge potential for opti-

    misation, especially in spacious

    buildings. The more the lighting

    is focused on the TASK AREA,

    the more significantly the mean

    illuminance level, and thus

    energy costs for the visual task

    areas, are reduced.

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    Focusing of light opens up new hori-

    zons. It provides freedom to light

    surrounding areas to achieve diver-

    sity. Vertically lit surfaces make a

    room more open and welcoming,

    dynamic changes in colour enhance

    visual quality.

    TASK AREA concepts focus the

    lighting onto individual visual task

    areas. Precise definition of visual

    tasks enables accurate realisation of

    lighting quality according to specific,

    locally restricted requirements.

    T A S K A R E A C O N C E P T S 5

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    The perfect conceptfor modern office landscapes

    TASK AREA concepts are more

    than just a response to current

    trends. They provide evidence

    of these trends and offer inno-

    vative ways of implementation.

    Modular axial flexibility

    The wish to provide a property

    with fittings suitable for both

    current and future requirements

    has resulted in the trend towards

    axis-based room design. Accor-

    ding to a Gallup poll, 75 % of

    businesses have responded to

    changes in work processes by

    reorganising the layout of their

    office premises in recent years.

    Demand for modularity in spe-

    culative properties is even more

    striking. Developers must expect

    tenants to change continuously

    and must rely on variable room

    fittings and layouts. Modern

    systems enable and increase

    axial flexibility.

    TASK AREA concepts take the

    following into account:

    New models of building planningand room design

    The use of new screen technologies

    Lifecycle management and optimum

    ratio of operating costs to invest-

    ment costs

    Peoples desire to deal responsibly

    with energy issues and personnel

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    All-round glare control for

    sloping TFT display screens

    New developments in telecom-

    munications call for progressive

    lighting concepts. Increasing

    numbers of laptops and orga-

    nisers with steeply inclined dis-

    plays are now in use and a

    larger number of workstations

    than ever must be ready to meet

    these special requirements.

    In particular, the arrangement

    of luminaires directly above

    workstations, dependent on

    room axis orientation, makes it

    necessary to reduce luminance

    levels at steep angles in order

    to minimise annoying reflections

    on the screen.

    Cutting operating costs

    Over a buildings entire lifecycle,

    the operating costs to the ten-

    nant are anything up to three

    times the original amount in-

    vested. This, in itself, is suffi-

    cient reason to make sure, from

    the outset, that operating costs

    are given due consideration.

    According to analyses carr ied

    out by the Hypo Vereinsbank in

    Austria, 15 to 20 % of the total

    costs of a tennant are spent on

    facility management. These

    costs include the operation and

    maintenance of lighting systems.

    In addition, there will be increa-

    sing pressure to categorize buil-

    dings according to their energy

    use. By making it possible to

    concentrate on actual visual

    tasks and by providing mainte-

    nance-friendly luminaire systems,

    TASK AREA concepts make it

    possible to keep these costs

    low. Efficiency can be further

    boosted by the use of intelligent

    lighting controls.

    Exploiting the design freedom

    afforded by EN 12464

    The TASK AREA concept is

    backed up by the recently pub-

    lished EN 12464 standard. This

    standard specifies quality crite-

    ria for the respective visual task

    area, thereby allowing rooms to

    be designed and fitted with

    equipment in a differentiated

    manner. The revised European

    standard supports the TASK

    AREA concept and prov ides

    approaches to lighting design

    that are more in line with the

    real needs of the individuals

    working in those spaces.

    T R E N D - S E T T I N G L I G H T 7

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    Individual TASK AREA

    Selective, task-oriented lighting

    of individual workstations is the

    most original type of task-area

    related design. A prerequisite is

    precise definition of the position

    and size of the visual task areas.

    Detailed assignment provides for

    maximum focusing of quantity

    and quality of light.

    Once individual workstations

    have been defined as TASK

    AREAs, the lighting scene can

    be adjusted completely individu-

    ally. The lighting is matched to

    the individual requirements of

    office users.

    Surrounding area

    Not only the visual task but

    also requirements in terms of

    convenience and spatial effect

    in accordance with peoples

    needs determine the lighting

    technology deployed in the

    surrounding area. There are

    almost no limits on design free-

    dom. Wallwashers, spots, light

    walls, uplights and downlights

    provide a wealth of options for

    individual lighting solutions for

    corridors and break-out areas.

    TASK AREAstrip

    Flexibility is increased by extend-

    ing the TASK AREA to comprise

    several workstations. Desks can

    be rearranged within a TASK

    AREA strip and can subsequently

    be regrouped or sub-divided.

    Combined with modern lighting

    control systems, no major in-

    stallation work is needed to re-

    address luminaires, in order to

    adapt to changes in the office

    structure. A buildings flexibility

    and modular character is de-

    fined by its axes. Axis-based

    design is exploited by TASK

    AREA concepts which focus on

    visual tasks for lighting design.

    Despite this, they do not reduce

    options for change within the

    axes of the room.

    TASK AREA room conceptsfrom individual workstations to modularstructures

    TASK AREA strip: several workstations are grouped

    together into a TASK AREA strip to achieve opti-

    mum balance between modular axial flexibility and

    focusing.

    Individual TASK AREA:

    if the area and nature

    of the visual task have

    been defined exactly,

    the potential for con-

    centration will be fully

    utilised.

    R O O M A X I S - B A S E D D E S I G N 9

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    Tailor-made luminaire conceptsfor task-area related lighting design

    Cluster luminaires

    Maximum focus

    Fully flexible arrangement of

    workstations thanks to micro-

    pyramidal optic (MPO) with

    all-round glare control

    Luminaires are closed and

    therefore maintenance-friendly

    High light output, low energy

    consumption

    Architecturally unobtrusive

    design

    Free-standing

    luminaires

    Flexible positioning in the space

    Individual lighting with maxi-

    mum flexibility for users

    Fully flexible arrangement of

    workstations thanks to micro-

    pyramidal optic (MPO) with

    all-round glare control

    Maintenance-friendly

    Architectural design alternative

    to ceiling luminaires

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    Task-area related IDpendant luminaires

    Positioning based on room

    axes, at right angles to the

    fenestration

    Photometric characteristics

    allow arrangement directly

    above workstations

    High light output ratio, low

    energy consumption

    Harmonious balance of room

    illumination and focusing on

    TASK AREA

    Light sail

    One lighting unit for up to

    three building axes

    Luminaires positioned directly

    above task area

    Possibility of on demand

    installation and integration into

    lighting management system

    Integration of acoustic elements

    Integration of air-conditioning

    units

    T A S K - A RE A L U M I N A I R E S 11

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    Intelligent luminairesneed-driven lighting management

    Straightforward instal-

    lation, flexible use of TASK

    AREA thanks to LUXMATE

    TASK AREA concepts focus on

    individual task areas. Flexibility

    can be retained and both TASK

    AREAs and surrounding areas

    can be modified with the help of

    DALI.

    Deploying DALI technology mini-

    mises effort in terms of design

    and installation. In contrast to

    conventional installations, no

    switched phase conductors are

    needed for each luminaire in

    the case of DALI-addressable

    luminaires. Predefined lighting

    levels for TASK AREAs, shelf

    surfaces and surrounding areas

    also speed up commissioning

    significantly.

    This flexibi lity is evident through-

    out the entire lifecycle of the

    system. Using LUXMATE Flexis,

    a product in the new LUXMATE

    LITENET product family, lumi-

    naires located anywhere can be

    grouped together into TASK

    AREAs or room areas, without

    any intervention in the installa-

    tion.

    This system boasts the same

    functionality as conventional

    DALI lighting control but is

    significantly more affordable.

    Whereas in the past only

    dimmable luminaires could be

    managed individually, now

    switchable lighting systems, too,

    can be adapted quickly and fle-

    xibly in response to changed

    requirements or new tenants.

    Application benefits:

    Change of TASK AREAs in the

    space

    Adaptation of TASK AREAs to

    changed room sizes according

    to building axes

    Re-organisation at the click of

    a mouse

    Graphical user interface for

    easy use of software

    Facility to settle accounts re-

    lating to specific customers

    Simultaneous blinds manage-

    ment, if required

    Before: conventional

    installation using bus

    relay involved consider-

    able effort in terms of

    design and installation.

    After : DALI-a ddressable

    luminaires significantly

    reduce effort in terms of

    design and installation

    further benefits include

    lower fire loads and

    switching loads.

    The first steps towards

    an innovative lighting

    solution: definition of

    ambient areas and

    assignment of lumi-

    naires to several TASK

    AREAs.

    Migration takes place

    without any intervention

    in the installation. Using

    LUXMATE Flexis, a

    product from the new

    LUXMATE LITENET

    product family, rooms

    and TASK AREAs can

    be adapted at the click

    of a mouse.

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    Luminaire

    switchable

    Luminaire

    addressable

    Dimming

    on demand

    Luminaire

    dimmable

    Dimming

    licence

    Costcomparison

    Maintenance Control:

    constant illuminance cuts

    energy consumption

    Automatic i lluminance control

    is also an element within the

    task area concept. International

    standards specify levels of illu-

    mination which must be maintai-

    ned. Since the light produced

    by a luminaire varies over time

    (due to build up of dirt on reflec-

    tive surfaces and reduction of

    lamp output), higher light levels

    need to be installed initially to

    achieve the stipulated levels

    later on. However, it makes bad

    economic sens to fully utilise

    this excess capacity.

    LUXMATE Flexis with Mainte-

    nance Control precisely adjusts

    the lighting level to the bare

    minimum required. The system

    takes account of the mainte-

    nance factor established by the

    Dimming on demand:

    addressable meansdimmable

    Using TASK AREA concepts,

    the quality of lighting can be

    optimally matched to users

    needs. One essential criterion

    is individual dimmability of the

    luminaires this enhances the

    value of a property. However,

    there are various reasons for

    not deploying this function from

    the outset: lower investment

    costs during construction, for

    instance. Addressable luminaires

    with a dimming on demand

    function can easily be upgraded

    to become dimmable luminaires

    without intervening in the instal-

    lation. The upgrade can be

    acquired in the form of a dimming

    licence thereby allows additional

    costs to be billed only to those

    tennants who wish to utilise the

    additional function.

    Longer maintenance

    intervals thanks to

    higher illuminance

    levels

    Maintenance intervals

    can be prolonged by

    over-dimensioning the

    system. Up until now,

    increased energy con-

    sumption made it un-

    advisable to do this.

    LUXMATE Flexis with

    Maintenance Controlkeeps the amount of

    light constant at the

    required level and sur-

    plus capacity is auto-

    matically dimmed.Maintenance interval

    Energy savings by dimming surplus capacity

    Illuminance in accordance with age and soiling of influence

    factors (lamps, luminaires, room)

    Illuminance maintenance value

    Maintenance

    Maintenance

    Maintenance

    Illuminan

    ce

    designer, thereby taking into

    account the continuous decrease

    in illuminance caused by ageing

    of lamps and luminaires be-

    coming dirty. Lamp operation

    is determined on the basis of

    the maintenance factor and the

    optimum time for relamping is

    also indicated. This gives the

    perfect balance between in-

    vestment and operating costs.

    Running costs, over the entire

    lifecycle of a building, can

    amount to up to three times the

    L I G H T I N G A N D R O O M M A N A G E M E N T 13

    original investment cost.

    The cost breakdowns on the

    following page provide more

    detailed information about the

    various systems.

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    1

    23

    4

    5

    Photometric

    criteria

    Flexibility

    Employee

    comfort

    Technology/Architecture

    Cost effectiveness

    (costs/maintenance)

    Five scenarios with their own individual strengthsGuidance on how to select luminaires and lighting management system

    Extremely energy-efficient in terms of system

    economy and illumination of work plane

    Optimised for individual standardised parameters

    Minimum cost with corresponding cuts in quality

    criteria that cannot be quantified in terms of cost

    A favourite for individual TASK AREA luminaires

    where the area of the visual task does not change

    An all-rounder that exploits potential benefits

    with regard to graded illuminance levels between

    surrounding area and possible TASK AREA to a

    large extent

    Number one in terms of technical operating costs

    thanks to extremely long maintenance intervals

    and zonal utilisation of installed load

    Individual TASK AREA luminaire offering maximum

    user flexibility thanks to direct and hence variable

    positioning in the work place

    Individual light ensures sense of well-being andcorrespondingly high user acceptance

    Free-standing luminaires are regarded as move-

    able furniture: tennant can invest in luminaires

    independently of developers fit-out

    One of the favourite TASK AREA strip concepts

    that are geared towards the axes of the building

    All-rounder with very high performance potential

    when compared against all assessment criteria

    Very high potential benefit thanks to automatic

    dimming of initially over-dimensioned systems

    One of the favourite TASK AREA strip concepts

    that are geared towards the axes of the building

    Best functionality in terms of building services

    (integrated lighting, air conditioning and acoustics)

    with corresponding potential cost benefits in

    terms of building construction* (assessment did

    not take these into consideration)

    Very high potential benefit thanks to automatic

    dimming of over-dimensioned systems

    Summary for a 15-year analysis period

    Operating and maintenance costs are a crucial

    factor and, in most cases, actually exceed

    investment costs.

    Every lighting concept has its own performance

    profile that may result in preference being given

    to it, depending on project-specific priorities.

    Factors such as convenience, flexibility and

    innovation are difficult to quantify. These criteriaare overlooked if a system is assessed exclusively

    in terms of investment costs.

    Basis of calculation

    TASK AREA 500 lx

    Surrounding area 300 lx

    Width, room axis 1.6 m

    Total room width 12.8 m (8 room axes)

    Room depth 4.8 or 5.6 m

    6 workstations

    System service life 15 years Operating hours 2000/year

    Cost of contractor 40/hr.

    Cost of cleaning luminaire 4 to 8

    Cost of cleaning room (painter) 5/m2

    Cost of electricity 0.0575/kWh,

    standing charge tariff 57/kW

    Comparison of dimmable concepts

    Photometric criteria: uniformity,

    control of direct glare and reflec-

    tions, utilisation factors

    Flexibility: layout and alignment of

    workstations, axial flexibility

    Visual comfort for employees:

    impression of space, balance,

    shadow detail Cost-effectiveness: investment,

    energy consumption, maintenance

    cycle

    Technology/architecture: technolo-

    gical and design progress, building

    integration, functionality, ACTIVE

    LIGHT capability

    Room-related lighting concept with MIREL louvre luminaires FEC 2/35 W T16

    Individual TASK AREA with LIGHT FIELDS cluster luminaires 4 x or 6 x 4/14 W

    Individual TASK AREA with LIGHT FIELDS free-standing luminaire 3/80 W TC-L

    Strip TASK AREA with FREELINE ID louvre luminaires 2 x 2/24 W + 1/80 W T16

    Strip TASK AREA with light sail LDS-L 2 + 4/54 W T16

    Arrangement of luminaires Performance profile Performance analysis

    1

    2

    3

    4

    5

    Photometric

    criteria

    Flexibility

    Employee

    comfort

    Technology/

    Architecture

    Cost effectiveness

    (costs/maintenance)

    1

    2

    3

    4

    5

    Photometric

    criteria

    Flexibility

    Employee

    comfort

    Technology/

    Architecture

    Cost effectiveness

    (costs/maintenance)

    1

    2

    3

    4

    5

    Photometric

    criteria

    Flexibility

    Employee

    comfort

    Technology/

    Architecture

    Cost effectiveness

    (costs/maintenance)

    1

    2

    3

    4

    5

    Photometric

    criteria

    Flexibility

    Employee

    comfort

    Technology/

    Architecture

    *Cost effectiveness(costs/maintenance)

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    Saving energy

    Extra investment in Maintenance Control with automatic

    compensation for over-dimensioning and daylight-dependent

    lighting control pay for themselves through energy savings

    alone. Aspects such as quality of user interaction, room-zone

    management, additional monitoring functions and much more

    (see pages 12/13) provide added value.

    1100

    Em [lx]

    1000

    900

    800

    700

    600

    500

    400

    Years 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

    Totalmain

    tenance

    Luminairecleaning

    Luminairecleaning

    Luminairecleaning

    Luminairecleaning

    Luminairecleaning

    Investment

    Grand total

    Energy & maintenance

    Total cost

    Extra investment cost*

    Potential energy savings*

    * for Maintenance Control and daylight-dependent c ontrol

    % 50 10025 75-50-75 -25 125 175 200150

    Totalmaintenance1100

    Em [lx]

    1000

    900

    800

    700

    600

    500

    400

    Years 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

    Investment

    Grand total

    Energy & maintenance

    Total cost

    Extra investment cost*

    Potential energy savings*

    * for Maintenance Control and daylight-dependent control

    % 50 10025 75-50-75 -25 125 175 200150

    1100

    Em [lx]

    1000

    900800

    700

    600

    500

    400

    Years 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

    Totalma

    intenance

    Totalma

    intenance

    Luminairecleaning

    Luminairecleaning

    Totalma

    intenance

    Luminairecleaning

    Luminairecleaning

    % 50 10025 75-50-75 -25 125 175 200150

    Investment

    Grand total

    Energy & maintenance

    Total cost

    Extra investment cost*

    Potential energy savings*

    * for Maintenance Control and daylight-dependent control

    1100

    Em [lx]

    1000

    900

    800

    700

    600

    500

    400

    Years 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

    Luminairecleaning

    Totalmaintenance

    Luminairecleaning

    % 50 10025 75-50-75 -25 125 175 200150

    Investment

    Grand total

    Energy & maintenance

    Total cost

    Extra investment cost*

    Potential energy savings*

    * for Maintenance Control and daylight-dependent control

    1100

    Em [lx]

    1000

    900

    800

    700

    600

    500

    400

    Years 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

    Totalmaintenance

    Luminairecleaning

    Luminairecleaning

    Totalmaintenance

    Luminairecleaning

    Luminairecleaning

    Investment

    Grand total

    Energy & maintenance

    Total cost

    Extra investment cost*

    Potential energy savings*

    * for Maintenance Control and daylight-dependent control

    % 50 10025 75-50-75 -25 125 175 200150

    Considerable reduction in operating costs thanks to longer

    maintenance intervals

    Over-dimensioning a lighting installation ensures that the main-

    tenance illuminance levels required in standards are met during

    actual operation, not just when the system is new. The extent

    of over-dimensioning has a decisive influence on the duration

    of the maintenance interval. LUXMATE Flexis with Maintenance

    Control compensates for over-dimensioning, thereby reducing

    energy consumption. LUXMATE daylight-dependent controlprovides scope for further potential energy savings.

    The aim is to strike the optimum balance between luminaires

    fitted, number of luminaires and photometric characteristics in

    order to minimise the costs of the maintenance work required.

    Total maintenance: cleaning of luminaires and room surfaces, replacement of li ghtsources (based on IEC Publication 97)

    Maintenance intervals Cost profile

    LIGHT FIELDS cluster

    LIGHT FIELDS free-standing luminaires

    FREELINE

    LDS light sail

    MIREL FEC45%

    53%

    57%

    60%

    45%

    Energy savings of up to 60 % for all luminaire types are one good reason to investin the LUXMATE lighting management system.

    C O M PA R I S O N O F S C E N A R I O S 15

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    Standards and quality criterialighting design fundamentals

    The EN 12464 standard is

    changing old design habits. It

    allows designers greater freedom

    and, above all, dictates that

    lighting must be delivered in the

    location where people have to

    perform their visual tasks. At

    the same time, it specifies com-

    prehensive quality criteria for

    a good lighting solution.

    EN 12464 introduces the con-

    cept of the visual task area

    where photometric quality

    criteria must be met. This area

    is any surface on which visual

    tasks are performed and can be

    horizontal, vertical or inclined.

    Amaintenance illuminance of

    0.7 and uniformity (the mini-

    mum-to-mean illuminance ratio

    in the area of the visual task)

    must be adhered to.

    Maintenance factor,

    maintenance value and

    maintenance intervals

    Every lighting installation ages

    and illuminance drops off due to

    a decrease in the luminous flux

    of lamps and the soiling of light

    sources, luminaires and the

    room. The designer must spe-

    cify the particular maintenance

    measures and intervals that

    must be adhered to in order

    to preserve the maintenance

    illuminance. This results in a

    maintenance factor that ensures

    the maintenance illuminance

    throughout the duration of the

    maintenance interval. If detailed

    information is not available,

    Zumtobel Staff recommends a

    reference maintenance factor of

    0.67 inspired by BGI 856 Office

    Lighting.

    The following maintenance illuminances (excerpt from EN 12464-1 Light

    and lighting. Lighting of work places Part 1: Indoor work places) apply for

    essential office visual tasks:

    Nature of room, visual task or activity Em UGRL Ra

    Filing, copying, circulation areas etc. 300 19 80

    Writing, reading, data processing 500 19 80

    Technical drawing 750 16 80

    CAD workstations 500 19 80

    Conference and discussion rooms 500 19 80

    Reception area 300 22 80

    Archives 200 25 80

    Em = Maintenance illuminance

    UGRL = Unified glare rating

    Ra = Lower limit for colour rendition index

    This means that the new stand-

    ard differs from the old approach

    in which the design objective

    was to achieve average illumi-

    nance throughout the room. In

    the surrounding area where visual

    tasks are performed less often,

    illuminance can drop down to

    300 lux. In offices, areas where

    visual tasks are performed

    essentially include the desk and

    the adjacent circulation area.

    Zumtobel Staff recommends

    compliance with quality criteria

    within this task area (see also

    BGI 856 Office Lighting, an

    informative brochure published

    by organisations in charge of

    accident insurance and lighting

    companies in Germany, Austria

    and Switzerland).

    Additional qual ity criteria:

    Well-balanced luminance

    distribution in the visual field

    ensures visual performance

    and visual comfort. This

    means that great importance

    is attached to visible vertical

    surfaces and how they are lit.

    Glare control at workstations

    must never exceed the UGR

    limit of 19 in order to prevent

    annoyance due to direct glare

    caused by luminaires.

    At visual display terminals,

    luminance levels on surfaces

    that could be reflected on the

    screen must not be too high.

    For luminaires, a mean lumi-

    nance of 1000 cd/m2 must not

    be exceeded above 65 to the

    downward vertical.

    Time

    Illuminance in accordance with age and soiling of influence

    factors (lamps, luminaires, room)

    Required maintenance illuminance

    Luminairecleaning

    Luminairecleaning

    Luminaire&roomcleaning

    andrelamping

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    Recommended minimum values for lighting areas

    in accordance with the BGI 856 interpretation of EN 12464

    Average luminances of luminaires and

    Reduction of reflected glare areas that are reflected on screen

    Screens with positive display 1000 cd/m2

    Screens with negative display, quality class I 1000 cd/m2

    (high-quality anti-reflection coating, verified by test certificate)

    Screens with negative display 200 cd/m2

    quality classes II and III

    Visual display terminal lighting

    Nature of room and Maintenance illuminance Colour renditionLighting concept visual task Horizontal Vertical index Ra Comments

    Office rooms and

    office-like rooms

    Screen-based work 500 80 g1=0,6

    Meetings 500 80 g1=0,6

    Cupboard and shelving surfaces 175 80 g1=0,5

    Surrounding area 300 80 g1=0,5

    Individual visual

    display terminals

    Screen-based work 500 g1=0,6

    TASK AREA concept

    Office rooms and

    office-like rooms

    Entire room, excluding 500 80 g1=0,6

    an edge strip 0.5 m wide

    Cupboard and shelving surfaces 175 80 g1=0,5

    Room-related lighting

    g1 = uniformity of illuminance Emin /E

    T A S K A R E A F U N D A M E N T A L S 17

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    Throughout the world, Zumtobel Staff

    is the competent reliable partner for

    innovative lighting solutions in all areas

    of application of professional interior

    lighting:

    Industry and Engineering

    Sport and Leisure

    Transit areas and Car parks

    Offices and Education

    Presentation and Retail

    Hotels and Catering

    Art and Culture

    Health & Care

    Orientation and Safety

    Active Li ght

    With production plants in Austria,

    Germany, Australia and the USA, and

    sales organisations in all major Euro-

    pean markets as well as commercial

    agencies in most regions of the world,

    Zumtobel Staff is one of the biggest

    international enterprises in the lighting

    sector.

    As a leader in innovation , we guaran-

    tee our customers global competence

    in lighting consulting and design

    assistance, superior product quality

    and future-proof technologies from

    individual luminaires to electronic

    lighting management systems.

    Corporate goal: We want to use light

    to create worlds of experience, make

    work easier and improve communica-

    tions and safety while remaining fully

    aware of our responsibility to the envi-

    ronment.

    P R E S E N T A T I O N

    A N D R E TA I L

    A R T

    A N D C U LT U R E

    H O T E L S

    A N D C AT E R I N G

    S P O R T

    A N D L E I S U R E

    H E A L T H &

    C A R E

    T R A N S I T A R E A S

    A N D C A R PA R K S

    O F F I C E S

    A N D E D U C AT I O N

    I N D U S T R Y

    A N D E N G I N E E R I N G

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    United Kingdom

    Zumtobel Staff Lighting Ltd.

    Unit 4 - The Argent Centre,

    Pump Lane

    Hayes/Middlesex UB3 3BL

    Tel. +44/(0)20 8589 1800

    Fax +44/(0)20 8756 4800

    Email: [email protected]

    www.zumtobelstaff.co.uk

    USA and Canada

    Zumtobel Staff Lighting

    3300 Route 9W

    Highland, New York 1258-2630

    Tel. +1/(0 )845/691 62 62

    Fax +1/(0)845/691 62 89

    www.zumtobelstaff.us

    www.zumtobelstaff.ca

    Australia and New Zealand

    Zumtobel Staff (Australia) Pty. Ltd.

    2 Wella Way

    Somersby, NSW 2250

    Tel. +61/(2)4340 3200

    Fax +61/(2)4340 2108

    Email: [email protected]

    www.zumtobelstaff.com.au

    Norway

    Zumtobel Staff Belysning AS

    Industriveien 11

    1481 Hagan

    Tel: +47/(0)670/62230

    Fax: +47/(0)670/62269

    Email: [email protected]

    Art.-No . 04 797 516-U K 10/0 4 Zumtobel Staff

    Technical data was correct at time of going to press.

    We reserve the right to make technical changes without notice.

    Please contact your local sales office for further information.

    Printed on environmentally-friendly chlorine-free paper. Printed on Consort Royal.

    Sweden

    Zumtobel Staff AB

    Norr Mlarstrand 8

    11220 Stockholm

    Tel: +46/(0)8/6511480

    Fax: +46/(0)8/265605

    E-mail: [email protected]

    www.zumtobelstaff.se

    Head offices

    Zumtobel Staff GmbH

    Schweizer Strasse 30

    Postfach 72

    A-6851 Dor nbirn, AUSTRIA

    Tel. +43/(0)5572/390-0

    Fax +43/(0)5572/22 826

    Zumtobel Staff GmbH & Co. KG

    Grevenmarschstr. 74-78

    D-32657 Lemgo, GERMANY

    Tel. +49/(0)5261/2 12-0

    Fax +49/(0)5261/2 12-7777

    www.zumtobelstaff.de

    www.zumtobelstaff.com

    Track and spots

    Modular lighting systems

    Down-/uplights

    Recessed luminaires

    Surface-mounted and pendant luminaires

    Wallwashers

    LED, task, wall and uplights

    Continuous row and batten luminaires

    High-bay luminaires

    Luminaires with extra protection

    Lighting Controls

    Emergency lighting

    Medical supply systems

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    TASK AREA

    CONCEPTS

    New task-area

    related lighting con-

    cepts in accordance

    with EN 12464 for

    higher quality, greaterflexibility and impro-

    ved efficiency.