En12464 copy

EN12464-1

major changes

✦ Lighting energy requirements: linked to EN 15193 – LENI (kWh/m2/year)

✦ Background area: task area – immediate surrounding – background area

✦ Illuminance/uniformity: for each task and activity – revised Clause 5

✦ Illuminance/uniformity: for immediate surroundings and background area

✦ Minimum illuminance on room surfaces: for example, walls and ceilings

✦ Mean cylindrical illuminance: Ez1.2m (1.6m) above floor

✦ Modelling index: informative values (Ez/Ehi)

✦ Calculation grid: grid points for control of illuminance and uniformity

✦ Luminaire luminance limits: in areas with display screen equipment

✦ Light and health: general statements on variability in light

✦ Daylight: general requirements

energy efficiency requirements

Energy savings can be made by harvesting daylight, responding to occupancy patterns and

maintenance characteristics of the installation, and making full use of controls.

A procedure for the estimation of the energy requirements of a

lighting installation is given in EN 15193- Energy Performance of

Buildings

Includes LENI (lighting energy numeric indicator)

leni

LENI is calculated on the lighting for the entire building. At the same time the lighting shall conform to current standards and recommendations (SS EN 12464-1).

Wtotal is the sum of Wlight and Wparasitic and is stated in kWh/year

A is the building's total* interior area: (m2).

* The area is calculated inside the outside walls excluding non-used cellar areas and unlit rooms.

LENIcalculated = Wtotal / A

* can be calculated on an annual basis, including annual, monthly or time basis.

leni

leni

part l

part l- efficacy

part l- controls

part l- controls

part l- metering

part l- problems

T5 Luminaire

• 60 llm/cw

Empty Office at 2am

• Manual switch left on

part l- problems

T5 Lamps

• 80-100 lm/w

Black box

• LOR 0%

part l- the future?

en12464

Adequate and appropriate lighting enables people to perform visual tasks efficiently and accurately. The

degree of visual comfort required in a wide range of work places is governed by the type and duration of

the activity.

lighting on the background area

The background area is taken as≥ 3m wide border

around the immediate surrounding area and

should be lit with a maintained horizontal

illuminance on the floor.

task area task area lxlx

immediate immediate surrounding surrounding

area area lxlx

background background area area

lxlx

> 750500300200150100>50

500300200Etask

Etask

Etask

Etask

1/3of

immediate surroundings

luminaires + flat screens

Screen high state luminaireScreen high state luminaire High luminance screenHigh luminance screenL> 200 cd/m2L> 200 cd/m2

Medium luminance screenMedium luminance screenL> 200 cd/m2L> 200 cd/m2

CASE A(positive polarity and normal

requirements concerning colour and details of the shown

information, like used in office, education etc..)

<3000 cdm/m2 <1500 cdm/m2

CASE B(Negative polarity and/ or higher requirements concerning colour

and details of the shown information, like used in office,

education etc..

<1500 cdm/m2 <1000 cdm/m2

surfaces

0,2 to 0,40,2 to 0,4

0,5 to 0,80,5 to 0,8 0,7 to 0,90,7 to 0,9

0,2 to 0,70,2 to 0,7

mean cylindrical illuminance

The required maintained mean cylindrical illuminance (average vertical plane illuminance) in the activity and interior areas shall be;

The cylindrical illuminance shall not be less than 50 lx.

Uniformity of illuminance U > 0,10- on a horizontal plane

1,2m above the floor.

For areas where good visual communication is important,

The maintained cylindrical illuminance Ez at 1,2m above

the floor level should not be not less than 150lx with U

>0,10

modelling

a value between 0,30 and 0,60 is an

indicator for good modelling

schedule of lighting

The size and position of the task area should be stated and documented.If unknown the whole area is treated as a task area or is uniformly lit

(U> 0.4)

Ref. no.Type of area, task or

activityĒmlx

UGRL Uo Ra Specific requirements

5.26.1 Filing, copying, etc. 300 19 0,4 80

5.26.2 Writing, typing, reading, data processing

500 19 0,6 80 DSE-work, see 4.12.2.

5.26.3 Technical drawing 750 16 0,7 80

5.26.4 CAD work stations 500 19 0,6 80 DSE-work, see 4.12.2.

5.26.5 Conference and meeting rooms 500 19 0,6 80 Lighting should be controllable.

5.26.6 Reception desk 300 22 0,6 80

5.26.7 Archives 200 25 0,4 80

illuminance grid

longest dimension longest dimension of the areaof the area

max distance (p) /Min grid max distance (p) /Min grid pointspoints

0.40m 0.15 or min 3 points








100m 5.00 or min 20 points

The maximum grid size should be:p = 0.2 x 5 log d where: p ≥10‘d’ is the longer dimension of the area (m)

However, if the ratio of the longer to the

shorter side is two or more then ‘d’ becomes

the shorter dimension of the area, and ‘p’ is

the maximum grid cell size (m).)

illuminance grid

colour rendering

The minimum value of colour rendering index for distinct types of interiors (areas), tasks or activities are given in clause 5.

It is important for visual performance and the feeling of comfort and well being, that colours in the environment, of objects and of human skin are rendered naturally, correctly and in a way that makes people look attractive and healthy.

Safety colours according to ISO 3864-1 shall always be recognisable as such.Higher colour rendering indexes are used when critical colour rendition is required.

The minimum value of colour rendering index for distinct types of interiors (areas), tasks or activities are given in clause 5.

NOTE For accurate rendition of colours of objects and human skin the appropriate individual special colour rendering index (Ri) should be considered.

daylight

daylight

•supply all or part of the lighting

•offer potential energy savings

•vary in level, direction and spectral composition

•provide variable modelling and luminance patters

•give visual contact with the outside environment

variability of light

Light is important to people’s health and wellbeing.

Light affects the mood, emotion and mental alertness of people.

Varying lighting conditions in time by higher illuminance, luminance distribution with daylight and/or dedicated electric lighting solutions…can stimulate people and enhance their wellbeing.

light + health

light + health

light + health

light + health

light + health

light + health

light + health

light + health

light + health

en12464 in practise

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