This free CPD webinar focuses on the British Standard for road lighting design. An updated version of BS5489-1 2020 has just been published which includes some significant changes from the previous version. This important update to the Standards means that anyone that specifies public lighting or uses this Standard needs to understand the latest thinking and changes from the previous version. This CPD webinar is essential for all those specifying or designing lighting for roads, amenity areas or city and town centres. You will learn how to carry out your role more effectively and provide better lighting which benefits the public and the planet. Our presenters are Nick Smith IEng FILP and Peter Harrison CEng FILP. Nick, from Nick Smith Associates, was the ILP’s representative on the British Standards Institute revision committee, so is the ideal expert to share his knowledge and explain how you can apply this to your work. Peter Harrison is the ILP Technical Director. The following is covered: • Position of BS5489 in the hierarchy of standards and tie into European and international standards • Summary of the changes • Reasons for road lighting • Environmental considerations: obtrusive light and conservation • Energy considerations and how this is determined • Design classification - determination and the risk assessment • Variable lighting considerations for subsidiary roads and traffic routes • Maintenance factor determination • Scotopic/Photopic (S/P) ratios - how these are used now • Glare, glare metrics and how to use them

1. BS5489-1:2020
OVERVIEW OF PRINCIPLE CHANGES
• Presented by Nick Smith IEng FILP MIES
– Managing Director -Nick Smith Associates Ltd

2. Standard’s Hierarchy
Status
• BS transposing EN standards
– BSEN13201 parts 2 to 5
• European technical approvals
• International standards
– CIE standards
• British Standards
– BS5489
• Industry Standards
– ILP, CIBSE, IET
Principle standards we use
• BSEN13201-1:2014
– Old BS5489-1:2013
– Now BS5489-1:2020
• BSEN13201-2:2015
• BSEN13201-3:2015
• BSEN13201-4:2015
• BSEN13201-5:2015
• BSEN13032-5:2018
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3. Overview BS5489-1:2020
• BS5489-1:2020 represents over 24 months of work
• Reviewing and agreeing changes
• Editing
• Professional and Public consultation’s
• Reviewing comments from the public,
• BSI editing,
• Publish to public.
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4. Overview BS5489-1:2020
• Revised by leading experts in street lighting from organizations like the
– ILP (3),
– CIBSE, SLL,
– LIA,
– Adept,
– HEA
– Highways England,
– Transport Scotland, South Wales Trunk road agency, North and Mid
Wales Trunk road agency
– leading lantern manufacturers and industry researchers
– Chairman #

5. Reasons for change
• Align with European Standard EN 13201:2015
• Aligning the code of practice to the CDM 2015 regulations which have introduced
some new requirements (particularly the Principal Designer).
• Consolidate areas of repetition,
– to move areas of text into more appropriate clauses and to consolidate tables.
• Use of white light in road lighting now compared to previous editions where sodium-
based discharge light sources were the predominant light source.
• Annex A has been simplified and the tables consolidated.
• The use of S/P ratios has been discontinued if using a white light source.
– Colour temperature becoming and issue
• The importance of “Smart Cities” BSI were very keen on this part
• Increasing importance of minimising energy consumption
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6. Overview of changes
• There are thousands of changes in BS5489-1:2020 when compared to the
old standard.
• When BS5489 was published in 2013 the European standard was still in draft
format there were a number of areas where the previous European
standard 2003 was referenced as well as the proposed standard 2015 as
well.
• Those references have obviously been updated and example of this is
reference to the S CE and ME classes used in the 2003 standard.
• Hyperlinks added to PDF versions,
– example
– Recommendations for the selection of lighting classes are given in Clause 5,
with additional guidance in Annex A. #

7. Overview of changes
• Many of the latest industry documents have been referenced,
• Some 57 were referenced in the final published version.
• One example is the section on maintenance factors has been updated to
reference
– ILP guidance note 11/19 and
– ISO / CIE TS2201:2019 .
• Equally there are parts of the document that have not changed.
• A good example of this is conflict areas which is broadly unchanged from the
2013 edition and of course still makes reference to professional lighting
guide 02.
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8. Absolute & Relative Photometry
• Definitions for absolute and relative photometry
– as well as a section giving more expanded commentary on the subject
too.
– While BS5489 is a lighting design standard and not a light measurement
standard specifically it was felt that putting a more concise definition
would be beneficial to designers.
• BSEN13032 More detail
• IES LM63
• Other too
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9. Absolute & Relative Photometry
• Which is better
– Neither is better then the other
– both have their advantages to the end user and the manufacture
– Cost is one of the advantages
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10. Absolute & Relative Photometry
• The significance of what make a file relative or absolute is
– not just how it is measured although this is important too,
– the measurement is done in accordance with the industry recommended
practices and standards, it is how the file is stored.
• An absolute photometry file has a "-1" in the flux field and the values stored
in the i-tables is the measured output and not relative to per thousand of
the source flux
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11. Absolute & relative Photometry
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246.80 4052.97

12. Absolute & relative Photometry
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246.80 4052.97
246.80 x 15.943=3924.12

13. Ecology
• There has been updated is the section on ecology.
• In the last few years we have begun to understand much better the potential
impact of exterior lighting on fauna and flora.
• As we develop new site, especially on green field sites the impact on
– bats,
– badgers,
– birds and
– other forms of ecology is significant.
• References made to the "Bats an artificial lighting" document in the UK
published by the ILP in 2018.
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14. Glare and TI%
• Another area that has been significantly modified is the application and calculation of
glare at the design stage.
• Many use
– luminous intensity classes
– G classes as a way of specifying or deciding the right optic setting to use.
• BS5489 now falls in line with the recommendations of EN13201
– EN13201 after BS5489-1:2013
– suggesting that the function of threshold increment should be calculated for P and
C classes as the first choice when (function of) threshold increment cannot be
calculated.
– If TI% cannot be calculated, the designer can consider the luminous intensity
classes as an alternative but his should not be the only consideration.
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15. Glare and TI%
• Glare has become a significant issue for many residents especially as apart of
conversation of existing street furniture where.
• Is glare the issue or the fact the lighting is just different because its been changed?
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16. Annex C:
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17. Annex C: Evaluation of
disability glare for C classes
Class TI (%)
C0 15
C1 15
C2 15
C3 20
C4 20
C5 20
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18. Annex C: Evaluation of
disability glare for P classes
Class TI (%)
P1 20
P2 25
P3 25
P4 30
P5 30
P6 35
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19. Example BS5489-1:2013
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20. Example BS5489-1:2020
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21. Other areas
• Other areas which have been updated is
– section on control gear which now references LED drivers,
– a new section on constant light output
– reference to semi cylindrical illuminance has been removed and reference
made to vertical illuminance in its place following consultation with
industry researchers.
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22. Colour temperature
• Removal of the definitions of
– warm,
– neutral white
– cool white.
• I could not find a documented standard that defined these lots of
recommendation by manufacturers which differ!
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23. Other areas
• New sections have been added on
– Smart cities and
– Central control or management systems (CMS)
– Vehicle charging points
• with reference made to industry documents and other
recommendations.
#

24. Class selection
• One of the most significant changes is the selection of lighting classes for
subsidiary roads.
• It is now assumed that the dominant light source will be white light and the
classes available in Annex A assume this to be the case.
• S/P ratio >1 and a high Ra
• No reference made to Ra which was previously used WHEN white light is
used
• Tables A4 A5 (from 2013) have been consolidated into in table
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25. Class Selection
• NOTE 1: Table A.5 assumes no parked vehicles; see risk
assessment in A.3.3.2.Traffic
Flow
Lighting Class
E1 to E4 E1 & E2 E3 & E4
Pedestrian and
cyclists only
Speed limit
v ≤ 30 mph
Speed limit
v ≤ 30
mph
Busy P5 P4 P3
Normal P5 P5 P4
Quiet P6 P5 P4
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26. Risk Assessment
• The relevant parameters are as follows.
• Traffic composition:
– where the traffic composition consists of a mixture of motorized traffic or
– cyclists
– and or pedestrians,
– the potential for impact is higher than for non-mixed usage.
– In such cases the risk assessment could lead to an increase in lighting level conforming to a lower
lighting class.
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27. Risk Assessment
• The relevant parameters are as follows.
• Complexity of task:
– factors which increase the complexity of the visual task include parked cars,
– school entrances
– traffic calming features.
– If one or more of these factors are present, the risk assessment could lead to an increase in lighting
level conforming to a lower lighting class.
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28. Risk Assessment
• The relevant parameters are as follows.
• Risk of crime or need for recognition of other people or their intent:
– where there is a need for better recognition,
– an additional illuminance class (EV) from BS EN 13201-2:2015, Table 6, might be chosen.
• Following the risk assessment, the designer needs to make a judgement on whether the lighting may be
adjusted by one class higher or lower.
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29. Class Selection
• NOTE 1: Table A.5 assumes no parked vehicles; see risk
assessment in A.3.3.2.
• NOTE 2:An EV lighting class using vertical illuminance, from BS
EN 13201-2:2015, Table 6, can be specified in addition to the
general lighting class when there are particular concerns about
crime and personal safety. EV is calculated at the typical height
of a human face (1.5 m) and in relevant viewing orientations. .
Traffic
Flow
Lighting Class
E1 to E4 E1 & E2 E3 & E4
Pedestrian and
cyclists only
Speed limit
v ≤ 30 mph
Speed limit
v ≤ 30
mph
Busy P5 P4 P3
Normal P5 P5 P4
Quiet P6 P5 P4
#

30. Class Selection
• NOTE 1: Table A.5 assumes no parked vehicles; see risk
assessment in A.3.3.2.
• NOTE 2:An EV lighting class using vertical illuminance, from BS
EN 13201-2:2015, Table 6, can be specified in addition to the
general lighting class when there are particular concerns about
crime and personal safety. EV is calculated at the typical height
of a human face (1.5 m) and in relevant viewing orientations.
• NOTE 3: To ensure adequate uniformity, the actual value of the
maintained average illuminance is not to exceed 1.5 times the
value indicated for the class.
Traffic
Flow
Lighting Class
E1 to E4 E1 & E2 E3 & E4
Pedestrian and
cyclists only
Speed limit
v ≤ 30 mph
Speed limit
v ≤ 30
mph
Busy P5 P4 P3
Normal P5 P5 P4
Quiet P6 P5 P4
#

31. Class Selection
• NOTE 1: Table A.5 assumes no parked vehicles; see risk
assessment in A.3.3.2.
• NOTE 2:An EV lighting class using vertical illuminance, from BS
EN 13201-2:2015, Table 6, can be specified in addition to the
general lighting class when there are particular concerns about
crime and personal safety. EV is calculated at the typical height
of a human face (1.5 m) and in relevant viewing orientations.
• NOTE 3: To ensure adequate uniformity, the actual value of the
maintained average illuminance is not to exceed 1.5 times the
value indicated for the class.
• NOTE 4: The actual overall uniformity of illuminance, Uo, needs
to be as high as reasonably practicable (see 7.2.6).
Traffic
Flow
Lighting Class
E1 to E4 E1 & E2 E3 & E4
Pedestrian and
cyclists only
Speed limit
v ≤ 30 mph
Speed limit
v ≤ 30
mph
Busy P5 P4 P3
Normal P5 P5 P4
Quiet P6 P5 P4
#

32. Class Selection
• NOTE 1: Table A.5 assumes no parked vehicles; see risk
assessment in A.3.3.2.
• NOTE 2:An EV lighting class using vertical illuminance, from BS
EN 13201-2:2015, Table 6, can be specified in addition to the
general lighting class when there are particular concerns about
crime and personal safety. EV is calculated at the typical height
of a human face (1.5 m) and in relevant viewing orientations.
• NOTE 3: To ensure adequate uniformity, the actual value of the
maintained average illuminance is not to exceed 1.5 times the
value indicated for the class.
• NOTE 4: The actual overall uniformity of illuminance, Uo, needs
to be as high as reasonably practicable (see 7.2.6).
• NOTE 5: The ambient luminance descriptions E1 to E4 refer to
the environmental zone as defined in ILP GN01 [N2].
Traffic
Flow
Lighting Class
E1 to E4 E1 & E2 E3 & E4
Pedestrian and
cyclists only
Speed limit
v ≤ 30 mph
Speed limit
v ≤ 30
mph
Busy P5 P4 P3
Normal P5 P5 P4
Quiet P6 P5 P4
#

33. Class Selection
• NOTE 1: Table A.5 assumes no parked vehicles; see risk
assessment in A.3.3.2.
• NOTE 2:An EV lighting class using vertical illuminance, from BS
EN 13201-2:2015, Table 6, can be specified in addition to the
general lighting class when there are particular concerns about
crime and personal safety. EV is calculated at the typical height
of a human face (1.5 m) and in relevant viewing orientations.
• NOTE 3: To ensure adequate uniformity, the actual value of the
maintained average illuminance is not to exceed 1.5 times the
value indicated for the class.
• NOTE 4: The actual overall uniformity of illuminance, Uo, needs
to be as high as reasonably practicable (see 7.2.6).
• NOTE 5: The ambient luminance descriptions E1 to E4 refer to
the environmental zone as defined in ILP GN01 [N2].
• NOTE 6: The illuminance classes are suggested minimum levels.
A risk assessment needs to be carried out to ensure that the
light levels are adequate, particularly for pedestrians and cyclists.
Traffic
Flow
Lighting Class
E1 to E4 E1 & E2 E3 & E4
Pedestrian and
cyclists only
Speed limit
v ≤ 30 mph
Speed limit
v ≤ 30
mph
Busy P5 P4 P3
Normal P5 P5 P4
Quiet P6 P5 P4
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34. Class Selection
• A) Environmental zone, as given in ILP GN01 [N2].
– Busy traffic flow refers to areas where the traffic usage is high and can be
associated with local amenities such as clubs, shopping facilities, public
houses, etc.
– Normal traffic flow refers to areas where the traffic usage is of a level
equivalent to a housing estate access road.
– Quiet traffic flow refers to areas where the traffic usage is of a level
equivalent to a residential road, and is mainly associated with the
adjacent properties or properties on other equivalent roads accessed
from this road.
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35. S/P ratios to use or not to use?
• The application of S/P ratios previously used to reduce the target illuminance
will no longer be used if the light source has an S/P ratio of greater than 1.
• In situations where the SP ratio < 1, where amber, Red or green
predominately monochromatic light sources are used the SP ratios will be
applied to increase the target luminance due to the poor ability to render
colour.
• It is not expected this will be carried out extensively as often in the
situations a risk assessment would’ve already been carried out to determine
the change in light source away from a full spectrum source. It’s
recommended in the notes that the designer is familiar with CIE 191
published in 2010 and I’ll be professional lighting guide 03 when making the
choice of lighting class.
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36. Other considerations
• Some of the other principal drivers for changes to the standard are
– Consideration of smart cities and how street lighting furniture can be
adapted to assist in gathering data.
– Energy savings continues to be important,
– Effects on human health
– Obtrusive lighting with ref made to the revised GN01.
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37. Overview
• BS5489-1:2020 was released on 20th May 2020,
• Its available from the BSI shop
– https://shop.bsigroup.com/ProductDetail?pid=000000000030374699
– Or search for BS5489 at the BSI shop
– I am told it will be added to IHS / CIS data base on the 5th June
• It will be supported by
– updates of industry lighting design software
– a more comprehensive days training course available from the ILP when
lockdown permits this!
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38. Questions
• New online training course now available
– www.nicksmithassociatestraining.thinkific.com
• Training course details at
– www.nicksmithassociates.co.uk
• mail@nicksmithassociates.com
• www.youtube.com
– Search for Nick Smith Associates Training
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