Advantages and disadvantages of sodium vapour lamp
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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
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