The bulb principally contains solid sodium metal inside a borosilicate glass tube that vaporizes once the lamp is turned on.
Sodium light bulbs.
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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.
During start while the sodium is still in solid form the lamp emits a dim reddish pink glow.
Once the metal is vaporized the emissions become the characteristic bright yellow associated with sodium vapor lamps.
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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.
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Two varieties of such lamps exist.
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