Multiple choice

What is the difference between a CFL and an LED lamp?

  1. To produce light, a CFL uses mercury vapour and phosphor while an LED lamp uses semi-conductor material.
  2. The average life span of a CFL is much longer than that of an LED lamp.
  3. A CFL is less energy-efficient is compared to an LED lamp.

Which of the statements given above is/ are correct?

  1. 1 only

  2. 2 and 3 only

  3. 1 and 3 only

  4. 1, 2 and 3
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Statement 1 is correct. CFLs contain mercury and phosphor whereas an LED lamp (LED light bulb) is a solid-state lamp that uses light-emitting diodes (LEDs) as the source of light. The LEDs involved may be conventional semiconductor light-emitting diodes, to organic LEDs (OLED), or polymer light-emitting diodes (PLED) device. Statement 2 is incorrect. LED lamps offer long service life and high energy efficiency, but initial costs are higher than those of fluorescent lamps. Statement 3 is correct. A CFL is less energy-efficient as compared to an LED lamp. 

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