GUIDANCE NOTES FOR THE REDUCTION OF OBTRUSIVE LIGHT
ALL LIVING THINGS adjust their behaviour according to natural light. Man’s invention of artificial light has done much to enhance our night time environment but, if not properly controlled, obtrusive light (commonly referred to as light pollution) can present serious physiological and ecological problems.
Obtrusive Light, whether it keeps you awake through a bedroom window or impedes your view of the night sky, is a form of pollution and can be substantially reduced without detriment to the lighting task.
Sky glow, the brightening of the night sky above our towns, cities and countryside, Glare the uncomfortable brightness of a light source when viewed against a dark background, and Light Trespass, the spilling of light beyond the boundary of the property or area being lit, are all forms of obtrusive light which may cause nuisance to others, waste money and electricity and result in the unnecessary emissions of greenhouse gases.
Think before you light.
- Is it necessary?
- What effect will it have on others?
- Will it cause a nuisance?
- How can I minimise the problem?
Do not “over” light. This is a major cause of obtrusive light and is a waste of energy. There are published standards for most lighting tasks, adherence to which will help minimise upward reflected light.
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