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There are many reasons why obtrusive light should be prevented.
Three of the more important are:-
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To minimise those problems introduced by obtrusive light to
the visual environment .
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To reduce unnecessary consumption of electrical energy.
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To reduce risks of visual interference to road users and thereby
improving road safety
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Following the publication of “Lighting in the Countryside:
Towards good practice” commissioned jointly by the Countryside
Commission and the Department of the Environment, we perceive that,
beyond those good practice principles there is a need for practical
advice for those responsible for ensuring the application of those
recommended practices.
It is intended that our guide should be used in a supportive role
to the “Lighting in the Countryside” publication, by providing
practical reference on the subject of obtrusive light and, as such,
is in no way intended as an alternative.
Every effort has been made throughout this guide to express references
in plain English and in understandable terms. Lighting industry
jargon has been avoided but, for reasons of necessity, certain technical
terms and expressions have had to be used.
This guide has been set out in seven parts to provide easier reference
to points of interest and to provide options for users in the use
of this guide. Sections 1 - 6 conclude with a summary box to each
sub section.
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Part 1 identifies the various forms
of obtrusive light such as sky glow, aura, glare, flicker and intrusion,
how they are referred to, and the various detrimental effects that
can be caused.
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Part 2 introduces the important issue of enforcing
control of obtrusive lighting - what powers are available, recommendations
that can apply, the need for lighting policies, the development
of control criteria and procedures for obtrusive light control purposes.
It concludes with flowchart recommendations in setting up controls
and provides advice on responding to problems.
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Part 3 commences with an executive resume of the
previous two parts and then considers a range of typical circumstances
in sports, roads, signs and architectural floodlighting where obtrusive
light can occur.
The information given in this part, in conjunction with lighting
scenarios set out in the Appendix (Part 7), is intended to provide
the user with on going support reference when dealing with future
problems.
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Part 4 introduces basic technical information - what
light is, the various effects of light, how they are described and
quantified, and the basics of human vision and the seeing processes.
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Part 5 looks at various forms of lighting equipment,
the various photometric distribution representations of light and
the application of light controlling devices.
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Part 6 covers the important elements for estimating,
calculating and measuring light.
Every effort has been made to present this in a basic step-by-step
approach. As such non-technical users of this guide should not encounter
any insurmountable difficulties.
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The Appendix, Part 7, provides the user with a range
of reference material. Tables, recommendations, references and publications
are all provided to aid users in their understanding.
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The CD-Rom version is in 
Microsoft Word 2000 and comes complete with content hyperlinks
to and from all sub sections. The hard copy version contains the
same information and colour photographs in 114 pages.
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