gs1medium

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

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

Which of the statements given above is/are correct?

  1. A.1 only
  2. B.2 and 3 only
  3. C.1 and 3 only
  4. D.1, 2 and 3
▶ Answer & Explanation

Correct answer: C. 1 and 3 only

Compact Fluorescent Lamps (CFLs) produce light by passing an electric current through mercury vapor in a tube coated with a fluorescent powder (phosphor), which then emits ultraviolet light that excites the phosphor to produce visible light. LED (Light Emitting Diode) lamps, on the other hand, use semiconductor materials that emit light when an electric current passes through them (electroluminescence). This solid-state process is inherently more energy-efficient, and LEDs generally have a longer lifespan compared to CFLs, and do not contain mercury.

Source: UPSC gs1 2011

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