What can we do against light pollution?
The LoNNe participants have gathered a lot of evidence, that high quality lighting can make a difference.
The Loss of the Night Network has elaborated recommendations to avoid common mistakes in outdoor lighting. Find here:
- Illustrated flyers for good practice for outdoor lighting in general and recommendations for nature parks.
- The full statements for best practices on outdoor lighting and recommendation for nature parks.
The green public procurement (GPP) 2020 aimed to mainstream low-carbon procurement across Europe in support of the EU’s goals to achieve a 20% reduction in greenhouse gas emissions, a 20% increase in the share of renewable energy and a 20% increase in energy efficiency by 2020. Find here
- GPP2020_webinar_about requirements for green street_lighting by Andrej Mohar, Dark – Sky, Slovenia
- GPP_2020_webinar_about street_lighting_in dark sky park_Wasserkuppe in Germany by Sabine Frank, Mathias Hahner and Andreas Haenel.
LoNNe strongly advises to significantly reduce the current proposed minimum street lighting levels (luminance and illuminance) in the street lighting norm EN 13 201, find here the reasons and the LoNNe objection to the street lighting norm EN 13201.
Measures against light pollution
Artificial light has a purpose, for example to illuminate the walkway. Light spill into the sky or adjacent habitats are polluting trespasses. Full shielding of light sources is useful to guide the light on target areas and avoid stray light. Visibility is rather a matter of contrasts and light uniformity, than of light intensity. Sustainable lighting planning will use low light intensities, because any light used in too high intensity will contribute to a greater extent to the accumulation of ALAN in form of skyglow. Low intensities, shielding of light sources and reducing the per capita number of lighting points can lower the contribution to skyglow and thus its environmental impact. Especially short wavelengths interfere with star visibility. Also the circadian clock of higher vertebrates, including humans, is the most sensitive to this part of the spectrum. Warm white or yellow light is recommended to reduce the negative impact.
The following five guidelines help to detect and reduce malpractices of outdoor lighting:
Direct the light to where it is needed
Reduce the light intensity to the minimum needed
Use light spectra adapted to the environment
When using white light, then in ‚warm‘ colour temperature (less than 3000 Kelvin)
Limit the use of light to when it is needed