sodium-vapour lamp

World English Dictionary
sodium-vapour lamp
 
n
a type of electric lamp consisting of a glass tube containing neon and sodium vapour at low pressure through which an electric current is passed to give an orange light. They are used in street lighting

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Encyclopedia Britannica
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sodium-vapour lamp

electric discharge lamp using ionized sodium, used for street lighting and other illumination. A low-pressure sodium-vapour lamp consists of a glass shell with metal electrodes, filled with neon gas and a little sodium. When current passes between the electrodes, it ionizes the neon, giving a red glow, until the hot gas vaporizes the sodium. This ionizes and shines a nearly monochrome yellow. High-pressure sodium-vapour lamps, made with a mixture of mercury and sodium, give a whiter light and are used for extra-bright lighting in places such as road intersections and sports stadiums

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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