Top Themes

ALAN Conference Series

ALAN 6 will take place from 16-18.06.2020 in Lleida, Spain.

Night Sky Data to the People!

A new website presents citizen science data

Touring Exhibition

Our touring exhibition with 15 posters can be borrowed for events!

'Loss of the Night' App

The 'Loss of the Night' app measures sky brightness! Take part in a world-wide citizen science project that measures star visibility and light pollution. The app is free!

City Night Time Lapse

This growing collection of time lapse videos of nights in urban centres provides insights how city lights change throughout the course of the night

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Lighting Technology

Current developments
The design of lighting systems has mostly focused on design for human needs. Light should be bright enough and should show good to very good colour rendering parameters. Ecolgical aspects were considered only regarding energy efficiency and, thus, with the reduction of carbon emissions. A profound reflection of lighting systems in regards to their visual, sanitary, ecological and social effects will show that new requirements are needed. A lighting system should only be provided in places and at times where it is really needed with the necessary intensity and quality with minimised energy consumption.

"Light quality" needs to be defined in more detail, including information about new aspects. Next to the well known aspects for human visual perception like the light colour or the colour rendering, also non-visual influences of artificial light on humans and the effected ecosystems need to be considered. Sustainable lighting also requires a control when artificial lighting is being used. So it should be though about installing individual adjustment measures of light intensity for the public space, like it is already being used by dimming or motion sensor solutions.