Sky radiator
A sky radiator , sky headlight or scheinanglizistisch Skybeamer (or Skytracker ) is a particularly strong projection headlight , which is usually to promotional purposes , z. B. of discos operated. The light is radiated upwards into the night sky, sometimes as particularly noticeable, rotating bundles of light rays. The effect comes about by scattering the light on haze and clouds.
The light from sky emitters can often be observed up to 30 km away. The sky radiators are usually offered with electrical outputs of 1200 to 10,000 watts. Xenon short-arc lamps (from 4000 watts) or metal halide lamps (up to 4000 watts) are mostly used .
Sky radiators are not a new invention. As early as the 1930s , Albert Speer had the night sky lit up with over 100 flak headlights ( arc lamps ) at major NSDAP events . The totality of all pillars of light is also called the dome of light .
Sky radiators are controversial because they contribute to light pollution - their use severely restricts the observation options of observatories . Living things such as migratory birds and nocturnal insects are severely affected. Road users can be distracted by the light. The devices are sometimes operated without the necessary building permit. The protest by amateur astronomers and nature conservationists has resulted in the operation of several sky radiators in Germany being officially prohibited. There are several court rulings on this. Sky radiators are no longer permitted in Bavaria since August 1, 2019.
The disk-like reflections of the light on the underside of the clouds have already been mistaken for UFOs by numerous people , which in individual cases led to police operations .
A permanent installation with lasers is Laserscape Kassel .
The Stuttgart television tower is equipped with a xenon rotating beacon , which is used for lighting (aviation) . This is the only remaining application for white rotating lights as obstruction lighting for aviation in Germany.
Web links
- Article “ Do you believe in UFOs? “By Andreas Hänel
- Picture gallery
- Skybeamer outside
- Due to the initiative "Biodiversity & Natural Beauty in Bavaria" (aka Save the Bees!) Changed Bavarian Nature Conservation Act , here § 11a
Individual evidence
- ↑ BayNatSchG: Art. 11a Sky spotlights and lighting systems - Citizen Service. Retrieved August 12, 2019 .