Civil Engineering Reference
In-Depth Information
Table 17.4
Maximum values
of veiling luminance for some
road lighting classes. (CIE
2013
)
L
veil
(cd/m
2
)
Road lighting class
M1/M2
0.85
M5/M6
0.25
No road lighting
0.04
in Table
17.4
. The values are based on an extra TI value of 15 % because of light
pollution.
17.3
European Standards
The European standard for sports lighting (CEN
2007b
) and the standard for the
lighting of outdoor work areas (CEN
2007a
) have sections specifically devoted to
the limitation of obtrusive light that are fully based on the 2003 CIE Guide. These
sections will probably be updated once the updated 2015 CIE Guide is available.
The European standard for road lighting has a section on obtrusive light that gives
a qualitative description and refers for additional quantitative information to the 2003
CIE Guide.
17.4
North-American Recommendations
North America has no overall Standard or Guide specifically devoted to the limita-
tion of light pollution caused by all the different types of outdoor lighting. IESNA
published two technical memoranda on the subject of light pollution: Technical Mem-
orandum “light trespass: research, results and recommendations” (IESNA
2011a
)
and, more specifically for roadway lighting, Technical Memorandum “addressing
obtrusive light (urban sky glow and light trespass) in conjunction with roadway light-
ing” (IESNA
2011b
). It summarises the methods advocated by the CIE and describes
a simple non-technical method for measuring light trespass. As written in these mem-
oranda: they only begin to address the issues and are limited in their scope. The 2014
American National Standard Practice for Road Lighting, ANSI/IES RP-8-14 does
give a quantitative description of sky glow and light trespass but no quantitative
recommendations (ANSI/IES
2014
). IESNA recommends that the “Model Light-
ing Ordinance” (MLO) prepared jointly by the International Dark-Sky Association
(IDA) and the Illuminating Engineering Society of North America (IESNA) (IDA-
IES
2011
) be used for non-highway public road lighting, viz. major, collector and
local roads where pedestrians and cyclists are generally present. The ordinance is
developed especially for local governing bodies to formulate regulations for the lim-
itation of light trespass and sky glow from different types of (mostly non-public)
lighting installations. For outdoor sports areas and the decorative or architectural
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