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 as compared to an LED lamp.

Which of the statement(s) given above is/are correct?

[UPSC Civil Services Exam – 2011 Prelims]

(a) 1 only

(b) 2 and 3 only

(c) 1 and 3 only

(d) 1, 2 and 3


Answer: (c)        

Explanation:

  • The primary difference between the CFL and LED bulb is that LED bulbs are more durable and has a long life. Hence, statement 2 is incorrect.
  • LED bulbs are much more efficient than CFL bulbs. Hence, statement 3 is correct.
  • The main semiconductor materials used to manufacture LEDs are:
    • Indium gallium nitride (InGaN): blue, green, and ultraviolet high-brightness LEDs.
    • Aluminium gallium indium phosphide (AlGaInP): yellow, orange, and red high-brightness LEDs.
    • Aluminium gallium arsenide (AlGaAs): red and infrared LEDs. Hence, statement 1 is correct.

Consider the following statements:                                                                   The Parliament of India can place a particular law in the Ninth Schedule of the Constitution of India. The validity of a law placed in the Ninth Schedule cannot be examined by any court and no judgement can be made on it. Which of the statements given above is/are correct?

Consider the following statements:                                               

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Consider the following statements:                                                         The Parliament of India can place a particular law in the Ninth Schedule of the Constitution of India. The validity of a law placed in the Ninth Schedule cannot be examined by any court and no judgement can be made on it. Which of the statements given above is/are correct?

Consider the following statements:                                               

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