Q.Which of the following lamps is the cheapest for the same wattage?

  • AFluorescent tube
  • BMercury vapour lamp
  • CGLS lamp
  • DSodium vapour lamp
Correct Answer : (C)

GLS lamp

Hints :

GLS  lamps is the cheapest for the same wattage.

Previous

Luminous efficiency of a fluorescent tube is

Next

Candela is the unit of which of the following?

Join The Discussion