Civil Engineering Reference
In-Depth Information
18.2.5
Screening by Structures and Trees
Structures such as facades of buildings may increase the negative effects of light
pollution if they are of high-reflectance materials. Their surfaces may become
disturbingly bright, for both humans and animals, because of spill light from neigh-
bouring lighting installations. On the other hand, if their reflectance is low, they will
absorb spill light and therefore reduce light pollution. In sports-stadium lighting the
roofs of the stands may effectively screen any spill light from floodlights mounted
under them. Such under-roof lighting is, from a light pollution restriction point of
view, therefore preferred over mast lighting. In order to ensure sufficiently uniform
and glare-free lighting on the playing field, the roofs must be sufficiently high.
Trees surrounding roads and other outdoor-lighting installations may serve as
effective light screens, especially since the light radiated in the extra-disturbing near-
horizontal directions is screened. Obviously, the location of the luminaires relative
to the trees should be such that the trees do not screen the light directed towards the
area to be lighted.
References
Bertolotti L, Salmon M (2005) Do embedded roadway lights protect sea turtles? Environ Manag
36(5):702-710
NSVV (2014) Richtlijn voor actieve markering (10V-06)
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