Light Pollution - What are the sources?
The major sources of light pollution include:
- Street lighting (which accounts for about 40%).
- Domestic and industrial security lamps.
- Advertising and display lighting.
- Floodlights for sporting events and building illumination.
Rising crime levels and fears over security are encouraging more and more homeowners to install security lighting to domestic properties.
Avoiding causing light pollution
Householders can avoid causing light pollution by making sure that they:
- Do not fit unnecessary lights.
- Do not use excessively bright lights; a 150 watt tungsten halogen lamp is quite adequate; 300 or 500 watt bulbs are too powerful for domestic security lighting.
- Do not leave lights on when they are not needed.
- Consider controlling lights with passive infra-red detectors, ensuring that they are correctly aligned and installed. For a porch light that is going to be left on all night, a 9 watt compact fluorescent lamp is normally adequate.
- Re-angle or partially shade lights so that the light only falls on the area that needs to be illuminated.
Last Updated: 25 January 2018