Goals for Public Lighting
Lighting only where it is truly useful. Every light source must be justified in the context of its health and environmental impacts.
Primarily for pedestrians
Abolish lighting on highways and main roads without pedestrian traffic (as done in Berlin, the UK). Minimum pedestrian traffic requirement (>2 pedestrians/hour) as a condition for lighting ~ limited operating hours. Illuminated crosswalks only on demand.
Safe spectrum
No blue to green light (U600 < 1%).
Proper direction
Strictly onto the pathway. New lighting on low posts ~1 meter high. Respect for §1013 of the Civil Code. Taller poles only in exceptional cases with high traffic intensity.
How You Can Help
Follow our online community and share our posts
LinkedIn organization page https://www.linkedin.com/company/light-dark-matters
LinkedIn discussion group https://www.linkedin.com/groups/13170041/
Support our campaigns
Ongoing email campaigns
Support our work with a financial donation
Talk to people
Friends and acquaintances
Speak to politicians at public meetings
Reach out to your local government and polluters in your area
Become a member of the association
Show your support for our work and goals — every member strengthens our position in negotiations.
Membership is free, with no obligations or legal responsibility.
Membership is free, with no obligations or legal responsibility.
David Rajmon, PhD
Geoscientist with a broad, integrative focus and international experience; science communicatorhttps://www.linkedin.com/in/davidrajmon/
https://www.researchgate.net/profile/David-Rajmon/research
https://www.researchgate.net/profile/David-Rajmon/research
1
Astronomical Beginnings
Since 1980, he has been engaged with light and light pollution, starting out as a young amateur astronomer.
Internship at the Astronomical Institute of the Czech Academy of Sciences in Ondřejov (1990), astronomy course in Prague (1990–1992), demonstrator at the Štefánik Observatory (1992–1998). Since then, actively involved in protecting the nighttime environment.
Internship at the Astronomical Institute of the Czech Academy of Sciences in Ondřejov (1990), astronomy course in Prague (1990–1992), demonstrator at the Štefánik Observatory (1992–1998). Since then, actively involved in protecting the nighttime environment.
2
Academic Work
Studied geosciences at the Faculty of Science, Charles University (1992–1998) — including work on the use of light in optical microscopy and multispectral analysis for space research.
Completed a PhD and taught at the University of Houston (1998–2013), working on multispectral data from the Moon’s surface.
Completed a PhD and taught at the University of Houston (1998–2013), working on multispectral data from the Moon’s surface.
3
Professional Experience
Geoscientist in applied research and petroleum exploration — Shell Houston (2003–2012), later independent consultant.
Specialized in basin modeling and petroleum system analysis.
Additional work included multispectral data analysis for the oil industry and research on impact craters.
Specialized in basin modeling and petroleum system analysis.
Additional work included multispectral data analysis for the oil industry and research on impact craters.
4
Focus on Light Pollution
Since 2018, he has worked intensively on light pollution in the town of Říčany, dedicating thousands of hours to studying the impact of light on health, the environment, and safety.
Has engaged in dialogue with local and national government, experts, and authors of technical norms and recommendations.
Activities include public education, legal analysis and testing of regulatory models, membership in the Říčany Environmental Commission, and expanding efforts to the national and international levels.
Activities include public education, legal analysis and testing of regulatory models, membership in the Říčany Environmental Commission, and expanding efforts to the national and international levels.
Founder of the Association Light & Dark Matters, z. s. – March 2025