April 2017: Calibration finished
In April 2017 / May 2017 all lightmeters have been compared side by side and calibrated against a reference lightmeter. In the coming two weeks the lightmeters are coming on-line again.



Beverwijk (Tata Steel)




Radio Kootwijk



NachtMeetnet locations

Measuring techique

The light from the night sky is measured by a sensitive light sensor that is pointing upwards.

A number of monitoring stations is equipped with a heating to keep the sensor free from dew and snow.
The monitoring data are stored locally and every 5 minutes a actual graph is sent to this website.

The Netherlands at Night

Photo by André Kuipers from the ISS March 2, 2012
Darkness in the Netherlands online

NachtMeetnet (Night Monitoring Network) shows the darkness in the Netherlands on-line at six locations after sunset.  Extension of NachtMeetnet with a few additional monitoring stations is under investigation.

Click at the left on the bars and tabs for the online data of the monitoring stations.

The Netherlands is one of the most light polluted countries in Europe. Natural darkness is becoming increasingly scarce as many lighting is often uncessary or excessive. This costs a lot of energy and money.

NachtMeetnet monitors the long term consequences of the modern developments of lighting and provides insights for lighting designers and governments to illuminate social responsibile with the right balance between light and darkness.

Your company, community or province can take part and contribute to Nachtmeetnet. Fill out the contact form for more info.
What is ?
NachtMeetnet is a cooperation between Lumineux Consult and Sotto le Stelle (Registered Arnhem KvK 59536152)