How to avoid causing light pollution
- Do not fit unnecessary lights.
- Do not use excessively bright lights. A 150 watt tungsten halogen lamp is quite adequate, and 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 nine watt compact fluorescent lamp is normally adequate.