Civil Engineering Reference
In-Depth Information
Table 17.2
Maximum values of light-limiting parameters for the environmental lighting zones E0,
E2 and E4. (CIE
2013
)
Zone
Curfew
E
vert,property
(lx)
L
facade
(cd/m
2
)
ULR
UFR
road
UFR
amenity
UFR
sports
I
90
−
110
(cd/klm)
E0
Pre
Post
n. a.
n. a.
0
0
n. a.
n. a.
n. a.
0.5
E2
Pre
Post
5
1
5
2.5
5
6
2
E4
Pre
Post
25
5
25
15
12
35
15
I
90
−
110
requirement: near observatories
n.a
. not applicable
Table 17.3
Maximum values of luminous intensity I
property
in critical directions towards neighbour-
ing properties according to size of the luminaire (A in m
2
) and the distance between luminaire and
property (
d
in m), for the environmental zones E0, E2 and E4. (CIE
2013
)
I
property
(cd)
Zone
Curfew
A
=
0 - 0.002
A
=
0.002 - 0.01
A
=
0.01 - 0.03
A
=
0.03 - 0.13
A
=
0.13 - 0.50
E0
Pre
Post
0
0
0
0
0
0
0
0
0
0
E2
Pre
Post
d
0.3
d
3
d
0.6
d
6
d
1
d
13
d
3
d
26
d
5
d
E4
Pre
Post
1
d
16
d
3
d
31
d
6
d
63
d
13
d
128
d
26
d
The limiting values of the luminous intensities in critical directions (e.g. towards
neighbouring properties) are dependent on the size of the bright parts of the luminaires
and upon the viewing distance (viz. the distance
d
between the luminaire and the
property). The smaller the bright part of the luminaire (more compact luminaire) and
the shorter the viewing distance, the higher will be the disturbance and thus the more
stringent the limiting values required. As an example, the limiting values for I
property
are given, again for environmental zones E0, E2 and E4, in Table
17.3
.
The limits for veiling luminance are required everywhere on both lighted and
unlighted roads where motorised and slow-moving road users may be confronted
with reduced visibility due to glare caused by light pollution from neighbouring
lighting installations. If the road itself has a lighting installation, the disturbance
caused by light pollution is smaller. The higher the lighting level of that road-lighting
installation, the smaller the disturbance will be because of the accompanying higher
adaptation state of the road users. The limits for veiling luminance are therefore
given according to the road-lighting class M1 - M6, where M1 has higher lighting
levels than the lower classes (see Part 1 Sect 9.1). These limiting values are given for
road-lighting classes M1, M2, M5, M6 and for the situation with no road lighting,
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