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

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Q: 64 (IAS/2011)
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?

question_subject: 

Science & Technology

question_exam: 

IAS

stats: 

0,125,72,33,18,125,21

keywords: 

{'led lamp': [0, 0, 0, 1], 'cfl': [0, 0, 0, 3], 'lamp': [0, 0, 1, 0], 'light': [16, 4, 34, 62], 'average life span': [1, 0, 0, 2]}

The question poses the differences between a CFL and an LED lamp, focusing on their mode of operation, lifespan, and energy efficiency.

Option 1 indicates that to produce light, a CFL uses mercury vapour and phosphor while an LED lamp uses semiconductor material. This statement is correct. CFL, or Compact Fluorescent Lamps, produce light by passing electricity through a tube containing argon and a small amount of mercury vapor. LEDs, on the other hand, are solid-state devices that produce light by the movement of electrons in a semiconductor material.

Option 2 claims that the average life span of a CFL is much longer than that of an LED lamp. This statement is incorrect. An LED (Light Emitting Diode) actually has a much longer lifespan, typically 25,000 to 50,000 hours, compared to a CFL which typically has a lifespan of 8,000 to 10,000 hours.

Option 3 suggests that a CFL is less energy-efficient compared to an LED lamp, which is correct. LED lamps are known for their higher energy efficiency when compared to CFLs.

So, option 3, which includes statements 1 and 3, is the correct answer.