Dalén light

A Dalén light is a light produced from burning of carbide gas (acetylene), combined with a solar sensor which automatically operates the light only during darkness.

AGA light near Djurgården in Stockholm

Overview

The technology was the predominant form of light source in lighthouses from the 1900s through the 1960s, when electric lighting had become dominant. The system was invented by Gustaf Dalén and marketed by his company AGA. Dalén later invented the AGA cooker in 1922. The Dalén light is notable because of its sun valve (a.k.a. solar valve), which earned its inventor the Nobel prize in physics. The Carbide lamp was developed in the early 1900s. While the lamps proved useful in many applications, the problem of safely storing acetylene meant they needed regular refilling which constrained their use in applications such as lighthouses.

Examples

Lighthouses using Dalén lighting have included:

gollark: Yes, they really managed the pandemic well in China by trying to ignore it/cover it up and hoping it would go away.
gollark: I like authoritarian governments, but only if they magically make everything work better with no problems and never cause problems for me or anyone else I know.
gollark: Doesn't that demonstrate that being more authoritarian and not having democracy does NOT automatically make a place good, if you don't like Singapore?
gollark: Isn't Singapore also one of those somewhat-authoritarian not-very-democracy places?
gollark: Well, I don't know much about it and don't care very much.

References
  1. "Centenario del Faro Recalada a Bahía Blanca" [Centennial to Recalada a Bahía Blanca Lighthouse]. hidro.gov.ar (in Spanish). Archived from the original on 6 July 2011. Retrieved 11 August 2010.


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