Sodium-vapor lamp
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A sodium-vapor lamp is a gas-discharge lamp that uses sodium in an excited state to produce light at a characteristic wavelength near 589 nm.
Sodium street lights in Tuntorp, Sweden
An HPS lamp after turning off. The alumina material glows red because it is still hot.
Two Honda Fits under low-pressure sodium lamps. Both appear black, even though the car on the left is bright red, while the car on the right is actually black.
High-pressure sodium lamps (SON).
Street light
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A street light, light pole, lamp pole, lamppost, streetlamp, light standard, or lamp standard is a raised source of light on the edge of a road or path. Similar lights may be found on a railway platfo
Sodium-vapor lamp
…Low-pressure sodium lamps are highly efficient electrical light sources, but their yellow-orange light restricts applications to outdoor lighting, such as street lamps, where they are widely used. High-pressure sodium lamps emit a broader spectrum of light than the low-pressure lamps, but they still have poorer color…
Detail of a street light base in Paris
A lamplighter cleaning a lantern during the Great War
William Murdoch's house in Redruth, UK, the first domestic house in the world to be lit by gas
Streetlights from an 1871 catalog