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BEAM P
LUS FOR
E
XISTING
B
UILDINGS
S
ITE
A
SPECTS
(S
A
)
V
ERSION
1.2
S
A
3 L
IGHT
P
OLLUTION
Copyright © 2012 BEAM Society Limited. All rights reserved.
Page 31
2
S
ITE
A
SPECTS
2.2
E
MISSIONS FROM THE
S
ITE
S
A
3 L
IGHT
P
OLLUTION
E
XCLUSIONS
None.
O
BJECTIVE
Ensure exterior lighting does not create unwanted and unnecessary light
pollution.
C
REDITS ATTAINABLE
1
P
REREQUISITES
None.
C
REDIT REQUIREMENT
1 credit for demonstrating that obtrusive light from exterior lighting meets
the specified performance for the environmental zone in which the
building development is located.
A
SSESSMENT
The Client shall provide evidence that the site and building lighting
installations comply with the criteria given in the reference publications
through submission of detailed measurements, calculations and/or
modelling studies carried out by a suitably qualified person.
Compliance is achieved when the designs are within the maximum figure
for each parameter (sky glow, light into windows, source intensity, and
building luminance), taken from Tables 2.1 to 2.6 in CIE 150 [1], Table 1
in CIBSE Factfile7 [2], or Table 1 in ILE Guidance Notes [3].
B
ACKGROUND
Outdoor and public area lighting is necessary for illuminating public
connections between premises, buildings and facilities to ensure the
security and safety of users. Light pollution [4,5] may be regarded as
waste light from lighting schemes that produces glare, obscures the night
sky, adversely effects nocturnal ecosystems, and may intrude on
neighbouring properties. The brightness of advertising signs is also a
concern [6]. The following table is taken from CIBSE Factfile 7 [2] :
The
definitions of the four zones are:
E1: Intrinsically dark areas: National Parks, Areas of Outstanding Natural
Beauty, etc.
Obtrusive light limitations for exterior lighting installations
Environmental
Zone
Sky Glow
ULR
(Max %)
Light into Windows
Ev (Lux) (1)
Source Intensity I
(kcd) (2)
Building Luminance
Before curfew (3)
Before
curfew
After
curfew
Before
curfew
After
curfew
Average L (cd/m
2
)
E1
0
2
1(4)
2.5
0.5(4)
0
E2
2.5
5
1
7.5
0.5
5
E3
5
10
2
10
1
10
E4
15
25
5
25
2.5
25
1
International Commission on Illumination. Guide on the limitation of the effects of obtrusive light from outdoor lighting
installations. Technical Report CIE 150:2003.
2
Chartered Institution of Building Services Engineers. Environmental Considerations for Exterior Lighting. Factfile No.7,
2003.
http://www.cibse.org/pdfs/fact72003.pdf3
The Institution of Lighting Engineers. Guidance notes for the reduction of obtrusive light .
http://www.britastro.org/dark-skies/pdfs/ile.pdf4
International Dark-sky Association. Information Resource Library.
http://www.darksky.org/resources5
International Commission on Illumination. Guidelines for Minimising Sky Glow. Technical Report CIE 126: 1997.
6
The Institution of Lighting Engineers. Brightness of Illuminated Advertisements. Technical Report No.5, 2001.