Two varieties of such lamps exist.
Low pressure sodium vapor lamp.
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Basically an lpsv lamp is a gas discharge lamp that uses sodium in an excited state to produce light.
Low pressure sodium lps lamps have a borosilicate glass gas discharge tube arc tube containing solid sodium a small amount of neon and argon gas in a penning mixture to start the gas discharge.
Low pressure sodium lamps are one of the most efficacious light sources.
Low pressure and high pressure low pressure sodium lamps are highly efficient electrical light sources but their yellow light restricts applications to outdoor lighting such as street lamps where they are widely used.
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As of april 2002 flagstaff streetlighting consisted of 1616 low pressure sodium and 1108 high pressure sodium or mercury vapor luminaires.
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High pressure sodium lights have a better color rendition than low pressure sodium lights.
The high pressure lights produce a more desirable golden to white light while the color produced by low pressure lights is yellow to orange.
The sodium vapor strikes an arc over 240 c.
But designers should take a second look at what else it has to offer.
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.
The sodium is mixed with other impurities to create a more white light.
The mercury helps add a blue spectrum light to the pure yellow of the sodium.
Low pressure sodium vapor lps lights are a specific type of gas discharge light also known as a high intensity discharge hid or arc light.
The bulb principally contains solid sodium metal inside a borosilicate glass tube that vaporizes once the lamp is turned on.
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A low pressure sodium vapor lamp or lpsv lamp is termed as a miscellaneous discharge lamp as it possesses some characteristics of high intensity discharge hid lamps as well as it resembles fluorescent lamps in other areas.
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High pressure sodium lights are more popular than low pressure lights because of this significant color difference.
