Question

Advantages and disadvantages of sodium vapour lamp

Answer 1

Sodium vapour lamp is a gas discharging lamp which uses sodium in an excited state to produce light near 589 nm wavelength. These lamps are available in low pressure and high pressure varieties.  

Advantages:

• Most energy efficient among all artificial light sources.

• Very long life span up to 50000 hours.

• Color temperature is always warm  

• They are ideal for using at airports, seaports, streets, railway marshalling yard and crossings etc.

Disadvantages:

• Only monochromatic color.

• Bad color rendering index

• Unusable for color recognition places.

• Sodium is hazardous and can catch fire in contact of air