Editing Gustaf Dalén (section)

===Dalén light===
[[File:Stockholm Sweden Blockhusudden-lighthouse-01.jpg|thumb|250px|right|The AGA lighthouse "Blockhusudden" close to Stockholm, initially set up in 1912. When the lighthouse was electrified in 1980 it was determined that the sun valve had been working continuously since 1912 without the need for an overhaul.]]

Initially Dalén worked with [[acetylene]] ([[IUPAC]]: [[ethyne]]), a flammable and sometimes  explosive [[hydrocarbon]] gas. Dalén invented [[Agamassan]] (Aga), a [[Substrate (materials science)|substrate]] used to absorb the gas allowing safe storage and hence commercial exploitation.

Acetylene produced an ultra-bright white light which superseded the less bright [[Liquefied petroleum gas|LPG]] as the fuel of choice for lighthouse illumination.

Dalén exploited the new fuel, developing the [[Dalén light]] which incorporated another invention, the [[sun valve]]. This device allowed the light to operate only at night, conserving fuel, and extending their service life to over a year.

The 'Dalen Flasher' was a device that, except for a small pilot light, only consumed gas during the flash stage. This reduced gas consumption by more than 90%. The AGA lighthouse equipment worked without any type of electric supply and was thus extremely reliable.

To a rugged coastal area like [[Scandinavia]], his mass-produced, robust, minimal maintenance buoys were a significant boon to safety and livelihood. AGA Lighthouses covered the entire [[Panama Canal]].