A discharge lamp in which the distance between the electrodes is large.
Note: This type of lamp (xenon, for example) is generally of extra high pressure. The arc fills the discharge tube and is therefore stabilized.
Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)
Celsius (previously Centigrade)
International Association of Marine Aids to Navigation and Lighthouse Authorities - AISM