Sodium Vapour Lamp

March 21, 2024 Post a Comment

Sodium vapour lamp

sodium-vapour lamp, electric discharge lamp using ionized sodium, used for street lighting and other illumination. A low-pressure sodium-vapour (LPS) lamp contains an inner discharge tube made of borosilicate glass that is fitted with metal electrodes and filled with neon and argon gas and a little metallic sodium.

How does a sodium vapour lamp work?

Working of Sodium Vapor Lamp Once the power supply is connected to the sodium vapor lamp, the neon gas is discharged and produces red-orange colored light. The heat generated by the discharge of the neon gas changes the solid sodium into sodium vapor.

Why is sodium vapor used in street lamps?

Sodium-vapour lamps are good for night-time illumination because of their high efficiency and because the light they produce penetrates mist and fog particularly well. As the bulb warms up, the sodium vapour becomes excited, emitting a characteristic yellow light of wavelength 589 nm.

How does sodium vapor produce light?

An electric discharge takes place when electricity is passed through sodium vapors at low or high pressure. As a result the valence electron present in sodium atoms become excited and emit light. The wavelength of the emitted light is 590 nanometers, which correspond to yellow light.

Where are sodium lamps used?

Common uses and advantages High pressure sodium lamps are used in outdoor lighting of streets and parking lots and in indoor settings where color rendering is not critical. These indoor settings include warehouse and shipping areas and some manufacturing areas.

What color is sodium light?

Low-pressure sodium lights give off a yellow or orange glow because they only produce a single wavelength of yellow light, which results in a less intense light output. The glass bulb houses solid sodium metal that vaporizes once the light is turned on.

Why do sodium Vapour lamps glow yellow?

Answer: Option B Solution: Sodium Vapour Lamps glow with yellow colour due to the emission of excess energy absorbed by sodium atoms, in the yellow region of the spectrum.

What is the wavelength of sodium Vapour lamp?

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.

Are sodium lights energy efficient?

Sodium lights operate in a range where the human eye is very sensitive and so there is less power required to achieve the same lighting effect. For this reason they are very efficient.

What are the two types of sodium lamp?

There are two kinds of sodium lights: Low Pressure (LPS) and High Pressure (HPS). These lamps are mostly used for street lighting as well as industrial uses. The lamp works by creating an electric arc through vaporized sodium metal. Other materials and gases are used to help start the lamp or control its color.

What is the efficiency of sodium Vapour lamp?

High-pressure sodium lamps are quite efficient—about 100 lumens per watt, when measured for photopic lighting conditions. Some higher-power lamps (e.g. 600 watt) have efficacies of about 150 lumens per watt.

What is the difference between sodium and mercury vapour lamps?

Hence, the light from the mercury vapour lamp is white. Although sodium vapour lamps produce much higher light output (about 90 lumens/watt) they cannot be used in lighting applications where colour-rendering property is very crucial.

What are the advantages and disadvantages of sodium Vapour lamp?

The advantages of sodium vapor lamps include the following.

Its efficiency is high.
Longer life.
It can be easily disposed of.
The operating temperature is low.
Energy-efficient.
Effective in foggy & rainy reasons.
Cool source.
Heat is fairly low.

How do sodium lamps differ from LED?

Sodium lamps are omnidirectional in that they emit light at 360 degrees, while led lamps emit light at 180. Hence, Statement 1 is correct. The two different technologies are entirely different methods of producing light. LED lifespan can be greater than 100,000 hours, more than four times that of sodium lamps.

Why is sodium light pink?

When the lamp is first turned on the sodium is not properly vaporised yet. Instead it is effectively a low light neon/argon light with some red from the neon, and some violet from the Argon. The combination of these two colours creates , pink light. This is where the pink colour comes from.

Can you light sodium on fire?

Sodium metal is flammable and exothermically generates hydrogen gas which can spontaneously light on fire in the presence of acids and water.

Why sodium light is monochromatic?

Simply said, light of the same wavelength emits only one colour, making it monochromatic. . These monochromatic lights have been in use for over a century as a monochromatic light source. Sodium lamps, mercury lamps, and spark lamps are all common examples.

Why is sodium Vapour lamp called monochromatic lamp?

The filaments of the lamp sputter fast moving electrons, which hit the sodium atoms(vapour) causing the valence electrons of the sodium atoms to excite to higher energy levels and the electrons thus excited relax by emiting the characteristic monochromatic bright yellow light(589nm).

What color temperature is sodium vapor lights?

Standard High Pressure Sodium lamps provide a distinctive yellow-colored light in the range of 1900 to 2000 degrees Kelvin. These lamps are characterized as having low color rendering capabilities.