Sodium lamps are used in

Sodium lamps are used in

Right Answer is:

Street lights


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.

There are two varieties of such lamps:

  1. Low-pressure sodium lamp
  2. High-pressure sodium lamp

Both the low pressure and high pressure are filled with both sodium and Neon gas.

Low-pressure sodium lamps are highly efficient electrical light sources, but their yellow light restricts applications to outdoor lighting such as street lamps.

High-pressure sodium lamps produce a broader spectrum of light than low-pressure lamps, but they still have poorer color rendering producing the monochromatic yellow light 

On turning on a sodium vapor lamp, initially, it emits a dim red/ pink light, which warms up sodium metal. After a few minutes, the light turns bright yellow, due to the vaporization of sodium, which is a nearly monochromatic light. Objects, lighted by sodium vapor lamps are not easily distinguished in color, because they appear almost entirely yellow due to the reflection of this narrow bandwidth of yellow light.

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