Q.Luminous efficiency of a fluorescent tube is

  • A10 lumen/watt
  • B20 lumen/watt
  • C40 lumen/watt
  • D60 lumen/watt
Correct Answer : (D)

60 lumen/watt

Hints :

Luminous efficiency of a fluorescent tube is 60 lumen/watt. Luminous efficiency is the ratio of luminous flux output to input power. Its unit is Lumen/Watt.

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