Sodium vapour lamps are preferred to incandescent lamps because of? (UPSC Prelims 1989)

Q. Sodium vapour lamps are preferred to incandescent lamps because of? (UPSC Prelims 1989)
Answer: Higher intensity of illumination
Notes: Sodium vapour lamps have been used widely for street lighting since the 1930s because of their efficiency (measured in lumens per watt) and the ability of their yellow light to penetrate fog.

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