Light and lighting - Lighting of work places - Part 2: Outdoor work places

EN 12464-2 specifies lighting requirements for outdoor work places, which meet the needs for visual comfort and performance. All usual visual tasks are considered. This European Standard is not applicable for emergency lighting; see EN 1838 and EN 13032-3. This European Standard does not specify lighting requirements with respect to the safety and health of workers at work and has not been prepared in the field of application of Article 153 of the EC treaty, although the lighting requirements, as specified in this standard, usually fulfil safety needs. Lighting requirements with respect to the safety and health of workers at work may be contained in Directives based on Article 153 of the EC treaty, in national legislation of member states implementing these directives or in other national legislation of member states. This European Standard neither provides specific solutions, nor restricts the designer’s freedom from exploring new techniques nor restricts the use of innovative equipment.

Licht und Beleuchtung - Beleuchtung von Arbeitsstätten - Teil 2: Arbeitsplätze im Freien

Diese Norm legt die Anforderungen an die Beleuchtung von Arbeitstätten/Arbeitsplätzen im Freien fest, die den Erfordernissen im Hinblick auf Sehkomfort und Sehleistung entsprechen. Alle üblichen Sehaufgaben sind berücksichtigt. Diese Europäische Norm ist nicht anwendbar für Notbeleuchtung: siehe EN 1838 und EN 13032-3.
Diese Europäische Norm legt keine Anforderungen an die Beleuchtung von Arbeitsstätten im Hinblick auf den betrieblichen Arbeitsschutz fest und wurde nicht im Anwendungsbereich von Artikel 153 der Europäischen Verträge erarbeitet, obwohl die lichttechnischen Anforderungen, die in dieser Norm enthalten sind, üblicherweise auch die Anforderungen im Hinblick auf Sicherheit erfüllen. Anforderungen an die Beleuchtung von Arbeitsstätten im Hinblick auf den betrieblichen Arbeitsschutz können in nach Artikel 153 der Europäischen Verträge erlassenen Richtlinien enthalten sein, in der nationalen Rechtsetzung der Mitgliedstaaten in Umsetzung dieser Direktiven oder in anderer nationaler Rechtsetzung der Mitgliedstaaten.
Diese Norm legt weder spezielle Lösungen fest, noch schränkt sie die Freiheit des Planers ein, neue Techniken zu erkunden oder innovative Techniken einzusetzen.

Lumière et éclairage - Éclairage des lieux de travail - Partie 2: Lieux de travail extérieurs

La présente Norme européenne fixe des exigences relatives à l’éclairage des lieux de travail extérieurs, qui répondent aux besoins requis pour garantir confort et performances visuels. Toutes les tâches visuelles courantes sont prises en compte. La présente Norme européenne n’est pas applicable à l’éclairage de secours, voir l'EN 1838 et l'EN 13032 3.
Bien que les exigences en matière d’éclairage spécifiées dans la présente Norme satisfassent de manière générale aux exigences de sécurité, la présente Norme européenne ne comporte pas d’exigences relatives à l’éclairage en rapport avec la santé et la sécurité des travailleurs présents sur les lieux de travail et n’entre pas dans le domaine d’application de l’Article 153 du Traité de l’Union européenne. Les exigences en matière d'éclairage relatives à la sécurité et la santé des travailleurs peuvent être contenues dans des directives basées sur l'Article 153 du Traité de l'Union européenne, dans des législations nationales mettant en œuvre ces directives ou dans d'autres dispositions réglementaires nationales des États membres.
La présente Norme européenne ne vise pas à fournir de solutions spécifiques, à restreindre la liberté des concepteurs dans l’exploration de nouvelles techniques, ni à restreindre l’utilisation d’équipements innovants.

Svetloba in razsvetljava - Razsvetljava na delovnem mestu - 2. del: Delovna mesta na prostem

General Information

Status
Published In Translation
Public Enquiry End Date
29-Sep-2013
Publication Date
20-Mar-2014
Current Stage
6100 - Translation of adopted SIST standards (Adopted Project)
Start Date
05-Dec-2019
Due Date
03-Dec-2020

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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Svetloba in razsvetljava - Razsvetljava na delovnem mestu - 2. del: Delovna mesta na prostemLicht und Beleuchtung - Beleuchtung von Arbeitsstätten - Teil 2: Arbeitsplätze im FreienLumière et éclairage - Éclairage des lieux de travail - Partie 2: Lieux de travail extérieursLight and lighting - Lighting of work places - Part 2: Outdoor work places91.160.10Notranja razsvetljavaInterior lightingICS:Ta slovenski standard je istoveten z:EN 12464-2:2014SIST EN 12464-2:2014en,fr,de01-april-2014SIST EN 12464-2:2014SLOVENSKI

STANDARDSIST EN 12464-2:20071DGRPHãþD
SIST EN 12464-2:2014
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 12464-2
January 2014 ICS 91.160.20 Supersedes EN 12464-2:2007English Version
Light and lighting - Lighting of work places - Part 2: Outdoor work places

Lumière et éclairage - Éclairage des lieux de travail - Partie 2: Lieux de travail extérieurs

Licht und Beleuchtung - Beleuchtung von Arbeitsstätten - Teil 2: Arbeitsplätze im Freien This European Standard was approved by CEN on 7 December 2013.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre:
Avenue Marnix 17,

B-1000 Brussels © 2014 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12464-2:2014 ESIST EN 12464-2:2014

EN 12464-2:2014 (E) 2 Contents Page

Foreword ...................................................................................................................................................................... 3 Introduction ................................................................................................................................................................. 4 1 Scope .............................................................................................................................................................. 5 2 Normative references .................................................................................................................................... 5 3 Terms and definitions ................................................................................................................................... 5 4 Lighting design criteria ................................................................................................................................. 5 4.1 Luminous environment ................................................................................................................................. 5 4.2 Luminance distribution ................................................................................................................................. 6 4.3 Illuminance ..................................................................................................................................................... 6 4.3.1 General ............................................................................................................................................................ 6 4.3.2 Illuminance on the task area ......................................................................................................................... 6 4.3.3 Illuminance of surroundings ........................................................................................................................ 7 4.3.4 Illuminance grid ............................................................................................................................................. 8 4.3.5 Uniformity and diversity ................................................................................................................................ 8 4.4 Glare ................................................................................................................................................................ 9 4.4.1 General ............................................................................................................................................................ 9 4.4.2 Glare rating ..................................................................................................................................................... 9 4.4.3 Veiling reflections and reflected glare ....................................................................................................... 10 4.5 Obtrusive light .............................................................................................................................................. 10 4.6 Directional lighting ...................................................................................................................................... 11 4.6.1 General .......................................................................................................................................................... 11 4.6.2 Modelling ...................................................................................................................................................... 11 4.6.3 Directional lighting of visual tasks ............................................................................................................ 11 4.7 Colour aspects ............................................................................................................................................. 11 4.7.1 General .......................................................................................................................................................... 11 4.7.2 Colour appearance ...................................................................................................................................... 12 4.7.3 Colour rendering .......................................................................................................................................... 12 4.8 Flicker and stroboscopic effects................................................................................................................ 12 4.9 Maintenance factor (MF) ............................................................................................................................. 12 4.10 Energy considerations ................................................................................................................................ 13 4.11 Sustainability ................................................................................................................................................ 13 5 Schedule of lighting requirements ............................................................................................................. 13 5.1 General .......................................................................................................................................................... 13 5.2 Composition of the Tables 5.1 to 5.15 below ............................................................................................ 14 5.3 The schedule of areas, tasks and activities .............................................................................................. 14 5.4 Lighting requirements for areas, tasks and activities ............................................................................. 15 6 Verification procedures ............................................................................................................................... 21 6.1 General .......................................................................................................................................................... 21 6.2 Illuminance ................................................................................................................................................... 21 6.3 Glare Rating .................................................................................................................................................. 21 6.4 Colour Rendering Index and colour appearance ..................................................................................... 21 6.5 Obtrusive light .............................................................................................................................................. 21 6.6 Maintenance schedule ................................................................................................................................ 21 Annex A (informative)

A–deviations ........................................................................................................................ 22 Bibliography .............................................................................................................................................................. 23 Index of areas, tasks and activities ......................................................................................................................... 24

SIST EN 12464-2:2014

EN 12464-2:2014 (E) 3 Foreword This document (EN 12464-2:2014) has been prepared by Technical Committee CEN/TC 169 “Light and lighting”, the secretariat of which is held by DIN. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by July 2014, and conflicting national standards shall be withdrawn at the latest by July 2014. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 12464-2:2007. Significant changes between this document and EN 12464-2:2007 are: a) the terms and definitions were deleted to avoid duplication with EN 12665; b) symbols were aligned with EN 12665; c) Figure 1 was corrected; d) 4.4.2 “Glare rating”, the reflectance has a default value of

= 0,15; e) 4.7.3 “colour rendering”, aligned with EN 12464-1; f) 4.10 “energy considerations”, aligned with EN 12464-1 and extended; g) subclause 5.1, insertion of requirements regarding routine cleaning of work spaces; h) Table 5.1 “General requirements for areas and for cleaning at outdoor work places”, title changed and new activity added; i) Table 5.12 “Railways and tramways”, updated and extended; j) Clause 6 “Verification procedures”, revised and harmonized with EN 12464-1. EN 12464, Light and lighting - Lighting of work places consists of the following parts: — Part 1: Indoor work places — Part 2: Outdoor work places According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. SIST EN 12464-2:2014

EN 12464-2:2014 (E) 4 Introduction To enable people to perform outdoor visual tasks efficiently and accurately, especially during the night, adequate and appropriate lighting should be provided. The degree of visibility and comfort required in a wide range of outdoor work places is governed by the type and duration of activity. This standard specifies requirements for lighting of tasks in most outdoor work places and their associated areas in terms of quantity and quality of illumination. In addition recommendations are given for good lighting practice. It is important that all clauses of the standard are followed although the specific requirements are tabulated in the schedule of lighting requirements (see Clause 5). SIST EN 12464-2:2014

EN 12464-2:2014 (E) 5 1 Scope This European Standard specifies lighting requirements for outdoor work places, which meet the needs for visual comfort and performance. All usual visual tasks are considered. This European Standard is not applicable for emergency lighting; see EN 1838 and EN 13032-3. This European Standard does not specify lighting requirements with respect to the safety and health of workers at work and has not been prepared in the field of application of Article 153 of the EC treaty, although the lighting requirements, as specified in this standard, usually fulfil safety needs. Lighting requirements with respect to the safety and health of workers at work may be contained in Directives based on Article 153 of the EC treaty, in national legislation of member states implementing these directives or in other national legislation of member states. This European Standard neither provides specific solutions, nor restricts the designer’s freedom from exploring new techniques nor restricts the use of innovative equipment. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 12665:2011, Light and lighting - Basic terms and criteria for specifying lighting requirements EN 13201-2, Road lighting - Part 2: Performance requirements EN 13201-3, Road lighting - Part 3: Calculation of performance ISO 3864-1, Graphical symbols - Safety colours and safety signs - Part 1: Design principles for safety signs and safety markings 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 12665:2011 apply. 4 Lighting design criteria 4.1 Luminous environment For good lighting practice it is essential that, in addition to the required illuminance, other qualitative and quantitative needs are satisfied. Lighting requirements are determined by the satisfaction of three basic human needs: — visual comfort, where the workers have a feeling of well-being; in an indirect way also contributing to a high productivity level, — visual performance, where the workers are able to perform their visual tasks, even under difficult circumstances and during longer periods, — safety. Main parameters determining the luminous environment are: — luminance distribution, SIST EN 12464-2:2014

EN 12464-2:2014 (E) 6 — illuminance, — glare, — directionality of light, — colour rendering and colour appearance of the light, — flicker. Values for illuminance and its uniformity, discomfort glare and colour rendering index are given in Clause 5; other parameters are described in Clause 4. NOTE Intentionally improved and designed luminous environment, glare-free illumination, good colour rendering, high contrast markings and optical and tactile guiding systems can improve visibility and sense of direction and locality. See CIE 196:2011. In addition to the lighting, there are other visual ergonomic parameters which influence visual performance, such as: — the intrinsic task properties (size, shape, position, colour and reflectance properties of detail and background), — ophthalmic capacity of the person (visual acuity, depth perception, colour perception), Attention to these factors can enhance visual performance without the need for higher illuminance. 4.2 Luminance distribution The luminance distribution in the visual field controls the adaptation level of the eyes, which affects task visibility. A well balanced luminance distribution is needed to increase: — visual acuity (sharpness of vision), — contrast sensitivity (discrimination of small relative luminance differences), — efficiency of the ocular functions (such as accommodation, convergence, pupillary contraction, eye movements). The luminance distribution in the visual field also affects visual comfort. Sudden changes in luminance should be avoided. 4.3 Illuminance 4.3.1 General The illuminance and its distribution on the task area and the surrounding area have a great impact on how quickly, safely and comfortably a person perceives and carries out the visual task. All values of illuminances specified in this standard are maintained illuminances and will provide for visual comfort, visual performance and safety needs. All illuminance average and uniformity values are dependent upon the grid definition (see 4.3.4). 4.3.2 Illuminance on the task area The values given in Clause 5 are maintained illuminances over the task area on the reference surface, which may be horizontal, vertical or inclined. The average illuminance for each task shall not fall below the value given in Clause 5, regardless of the age and condition of the installation. SIST EN 12464-2:2014

EN 12464-2:2014 (E) 7 The values are valid for normal visual conditions and take into account the following factors: — psycho-physiological aspects such as visual comfort and well-being, — requirements for visual tasks, — visual ergonomics, — practical experience, — safety, — economy. The value of illuminance may be adjusted by at least one step in the scale of illuminances (see below), if the visual conditions differ from the normal assumptions. A factor of approximately 1,5 represents the smallest significant difference in subjective effect of illuminance. The recommended scale of illuminance (in lx) is: 5 – 10 – 15 – 20 – 30 – 50 – 75 – 100 – 150 – 200 – 300 – 500 – 750 – 1 000 – 1 500 – 2 000 The required maintained illuminance should be increased, when: — visual work is critical, — visual task or worker is moving, — errors are costly to rectify, — accuracy or higher productivity is of great importance, — the visual capacity of the worker is below normal, — task details are of unusually small size or low contrast, — the task is undertaken for an unusually long time. The required maintained illuminance may be decreased when: — task details are of an unusually large size or high contrast, — the task is undertaken for an unusually short time or on only rare occasions. 4.3.3 Illuminance of surroundings The illuminance of surrounding areas shall be related to the illuminance of the task area and should provide a well-balanced luminance distribution in the visual field. Large spatial variations in illuminances around the task area may lead to visual stress and discomfort. The illuminance of the surrounding areas may be lower than the task illuminance but shall be not less than the values given in Table 1. The surrounding area should be a band with a width of at least 2 m around the task area within the visual field. SIST EN 12464-2:2014

EN 12464-2:2014 (E) 8 Table 1 — Relationship of illuminances of surrounding areas to task area Task illuminance lx Illuminance of surrounding areas lx ≥ 500 300 200 150 50 ≤ mE ≤ 100 < 50 100 75 50 30 20 no specification In addition to the task illuminance the lighting shall provide adequate adaptation luminance in accordance with 4.2. 4.3.4 Illuminance grid A grid system shall be created for the task and surrounding areas to indicate the points at which the illuminance values are calculated and verified. Grids approximating a square are preferred, the ratio of length to width of a grid cell shall be kept between 0,5 and 2 (see also EN 12193). The maximum grid size shall be: dp log10 5

0,2 = × (1) where d is the longer dimension of the area, in m, if the ratio of the longer to the shorter side is less than 2, otherwise d is the shorter dimension of the area; and p is the maximum grid cell size in m. The value of p should be that p ≤ 10 m. NOTE Formula (1) (coming from CIE x005:1992) has been derived under the assumption that p is proportional to d10log, where: p = 0,2 m for d = 1 m; p = 1 m for d = 10 m; p = 5 m for d = 100 m. 4.3.5 Uniformity and diversity The task area shall be illuminated as uniformly as possible. The illuminance uniformity of the task area shall be not less than the values given in Clause 5. The uniformity of the surroundings shall not be less than 0,10. In some cases, e.g. railways, illuminance diversity is also an important quality criterion. SIST EN 12464-2:2014

EN 12464-2:2014 (E) 9 4.4 Glare 4.4.1 General Glare is the sensation produced by bright areas within the field of vision and may be experienced either as discomfort glare or disability glare. Glare caused by reflections in specular surfaces is usually known as veiling reflections or reflected glare. It is important to limit the glare to the users to avoid errors, fatigue and accidents. NOTE Special care is needed to avoid glare when the direction of view is above horizontal. 4.4.2 Glare rating The glare directly from the luminaires of an outdoor lighting installation shall be determined using the CIE Glare Rating (RG) method, based on the formula: +=9,0vevl10Glog2427LLR (2) where Lvl is the total veiling luminance in cd·m–2 caused by the lighting installation and is the sum of the veiling luminances produced by each individual luminaire (Lvl = Lv1 + Lv2 +…..Lvn). The veiling luminance of the individual luminaires is calculated as Lv = 10·(Eeye,-2), in which Eeye is the illuminance at the observer's eye in a plane perpendicular to the line of sight (2° below horizontal, see Figure 1) and , is the angle between the observer’s line of sight and the direction of the light incident from the individual luminaire; Lve is the equivalent veiling luminance of the environment in cd∙m–2. From the assumption that the reflection of the environment is totally diffuse, the equivalent veiling reflection from the environment may be calculated as Lve = 0,035Ehav∙–1, in which

represents the average reflectance and Ehav the average horizontal illuminance of the area. If the value of reflectance is not known,

should be taken as 0,15.

Key 1 line of sight 2 plane of Eeye Figure 1 — The angle between the observer’s line of sight and the direction of the light incident from the individual luminaire RG should be computed at grid positions as defined in 4.3.4, at 45° intervals radially about the grid points with 0° direction parallel to the long side of the task area. SIST EN 12464-2:2014

EN 12464-2:2014 (E) 10 All assumptions made in the determination of RG shall be stated in the scheme documentation. The RG value of the lighting installation shall not exceed the RGL-value given in Clause 5. 4.4.3 Veiling reflections and reflected glare High brightness reflections in the visual task may alter task visibility, usually detrimentally. Veiling reflections and reflected glare may be prevented or reduced by the following measures: — appropriate arrangement of luminaires and work places, — surface finish (e.g. matte surfaces), — luminance restriction of luminaires, — increased luminous area of the luminaire. 4.5 Obtrusive light To safeguard and enhance the night time environment it is necessary to control obtrusive light (also known as light pollution), which can present physiological and ecological problems to surroundings and people. The limits of obtrusive light for exterior lighting installations, to minimize problems for people, flora and fauna, are given in Table 2 and for road users in Table 3. Table 2 — Maximum obtrusive light permitted for exterior lighting installations Environmental zone Light on properties Luminaire intensity Upward light ratio Luminance Ev lx I cd RUL % Lb cd∙m–2 Ls cd∙m–2 Pre-curfewa Post-curfew Pre-curfew Post-curfew

Building facade Signs E1 2 0 2 500 0 0 0 50 E2 5 1 7 500 500 5 5 400 E3 10 2 10 000 1 000 15 10 800 E4 25 5 25 000 2 500 25 25 1 000 where E1 represents intrinsically dark areas, such as national parks or protected sites; E2 represents low district brightness areas, such as industrial or residential rural areas; E3 represents medium district brightness areas, such as industrial or residential suburbs; E4 represents high district brightness areas, such as town centres and commercial areas; Ev is the maximum value of vertical illuminance on properties in lx; I is the light intensity of each source in the potentially obtrusive direction in cd; RUL is the proportion of the flux of the luminaire(s) that is emitted above the horizontal, when the luminaire(s) is (are) mounted in its (their) installed position and attitude, and given in %; Lb is the maximum average luminance of the facade of a building in cd∙m–2; Ls is the maximum average luminance of signs in cd∙m–2. a In case no curfew regulations are available, the higher values shall not be exceeded and the lower values should be

taken as preferable limits. SIST EN 12464-2:2014

EN 12464-2:2014 (E) 11 For users of transport systems for the relevant viewing positions in the path of travel the threshold increment shall not exceed 15 % based on the actual adaptation level. If the adaptation level is not known and no road lighting is provided, an adaptation luminance of 0,1 cd/m2 shall be applied. Table 3 — Maximum values of threshold increment from non-road lighting installations Light technical parameter Road lighting classesa, b No road lighting ME5 ME4 / ME3 ME2 / ME1f Threshold increment (TI) c, d, e 15 % based on adaptation luminance of 0,1 cd∙m-2 15 % based on adaptation luminance of

1 cd∙m-2 15 % based on adaptation luminance of
2 cd∙m-2 15 % based on adaptation luminance of

5 cd∙m-2 NOTE During the life of this standard, the designations are likely to change from ME, CE, S to M, C, P. a Road lighting classes as given in EN 13201-2. b If CE-class or S-class has to be applied, adaptation level of luminance should be used according to

CEN/TR 13201-1:2004, Table 3 or equivalent national standards. c TI calculation as given in EN 13201-3. d Limits apply where users of transport systems are subject to a reduction in the ability to see essential information. Values given are for relevant positions and for viewing directions in the path of travel. e Table 5.2 in CIE 150:2003 gives corresponding values for the veiling luminance Lv. f The adaptation luminance values are taken from CIE 150:2003, Table 2.4. 4.6 Directional lighting 4.6.1 General Directional lighting may be used to highlight objects, reveal texture and improve the appearance of people. This is described by the term “modelling”. Directional lighting of a visual task may also affect its visibility. 4.6.2 Modelling Modelling is the balance between diffuse and directional light. It is a valid criterion of lighting quality in virtually all applications. The people and objects should be lit so that form and texture are revealed clearly and pleasingly. This occurs when the light comes predominantly from one direction; the shadows so essential to good modelling are then formed without confusion. The lighting should not be too directional or it will produce harsh shadows. 4.6.3 Directional lighting of visual tasks Lighting from a specific direction may reveal details within a visual task, increasing their visibility and making the task easier to perform. Veiling reflections and reflected glare should be avoided, see 4.4.3. 4.7 Colour aspects 4.7.1 General The colour qualities of a near-white lamp are characterized by two attributes: — the colour appearance of the lamp itself; — its colour rendering capabilities, which affect the colour appearance of objects and persons illuminated by the lamp. SIST EN 12464-2:2014

EN 12464-2:2014 (E) 12 These two attributes shall be considered separately. 4.7.2 Colour appearance The “colour appearance” of a lamp refers to the apparent colour (chromaticity) of the light emitted. It is quantified by its correlated colour temperature (Tcp). Colour appearance may also be described as in Table 4. Table 4 — Lamp colour appearance groups Colour appearance Correlated colour temperature Tcp K Warm below 3 300 Intermediate 3 300 to 5 300 Cool above 5 300 The choice of colour appearance is a matter of psychology, aesthetics and of what is considered to be natural. 4.7.3 Colour rendering Good colour rendering improves visual performance and the feeling of comfort and well-being. Colours in the environment and of objects shall be rendered correctly and, where reasonably practicable, human skin shall be rendered naturally. The latter may allow some compromise at outdoor workplaces. To provide an objective indication of the colour rendering properties of a light source the general colour rendering index Ra is used. The maximum value of Ra is 100. The minimum value of colour rendering index for distinct types of outdoor areas, tasks or activities are given in Tables 5.1 to 5.15. Safety colours according to ISO 3864-1 shall always be recognizable as such. Colour rendering properties of light from a light source may be reduced by optics, glazing and coloured surfaces. For accurate rendition of colours of objects and human skin the appropriate individual special colour rendering index (Ri) should be considered. 4.8 Flicker and stroboscopic effects Flicker causes distraction and may give rise to physiologica

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