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What is the difference between a CFL and an LED lamp?
a) To produce light, a CFL uses mercury vapour and phosphor while an LED lamp uses semiconductor material.
b) The average life span of a CFL is much longer than that of an LED lamp.
c) A CFL is less energy-efficient as compared to an LED lamp.
Q. Which of the statements given above is/are correct?
a) To produce light, a CFL uses mercury vapour and phosphor while an LED lamp uses semiconductor material.
b) The average life span of a CFL is much longer than that of an LED lamp.
c) A CFL is less energy-efficient as compared to an LED lamp.
Q. Which of the statements given above is/are correct?
- a)1 only.
- b)2 and 3 only.
- c)1 and 3 only.
- d)1, 2and 3.
Correct answer is option 'C'. Can you explain this answer?
Most Upvoted Answer
What is the difference between a CFL and an LED lamp?a) To produce lig...
Difference between CFL and LED lamps:
Statement a: To produce light, a CFL uses mercury vapour and phosphor while an LED lamp uses semiconductor material.
This statement is correct. Compact Fluorescent Lamps (CFLs) contain mercury vapor that emits ultraviolet (UV) light when it is electrically stimulated. The UV light then interacts with the phosphor coating inside the lamp, which in turn emits visible light. On the other hand, Light Emitting Diode (LED) lamps use a semiconductor material, typically a compound of gallium and arsenic, that emits light when an electric current passes through it. The specific materials and manufacturing processes used in LED lamps can vary, but they all involve semiconductors rather than mercury and phosphor.
Statement b: The average life span of a CFL is much longer than that of an LED lamp.
This statement is incorrect. LED lamps generally have a longer lifespan compared to CFLs. CFLs typically last for around 8,000 to 10,000 hours, while LED lamps can last for 25,000 to 50,000 hours or even longer, depending on the quality of the LED and how it is used. The longer lifespan of LED lamps is one of their key advantages over CFLs, as it reduces the frequency of replacement and maintenance.
Statement c: A CFL is less energy-efficient as compared to an LED lamp.
This statement is correct. CFLs are less energy-efficient compared to LED lamps. CFLs convert about 30% of the energy they consume into visible light, while the remaining 70% is lost as heat. On the other hand, LED lamps are much more energy-efficient, with an average conversion rate of 80-90%. They produce very little heat, making them more efficient in terms of energy consumption. LED lamps also have the advantage of being able to dim without losing efficiency, further contributing to their overall energy efficiency.
Conclusion:
Based on the analysis, statement a and c are correct. Therefore, option 'C' is the correct answer, which states that statement 1 and 3 only are correct.
Statement a: To produce light, a CFL uses mercury vapour and phosphor while an LED lamp uses semiconductor material.
This statement is correct. Compact Fluorescent Lamps (CFLs) contain mercury vapor that emits ultraviolet (UV) light when it is electrically stimulated. The UV light then interacts with the phosphor coating inside the lamp, which in turn emits visible light. On the other hand, Light Emitting Diode (LED) lamps use a semiconductor material, typically a compound of gallium and arsenic, that emits light when an electric current passes through it. The specific materials and manufacturing processes used in LED lamps can vary, but they all involve semiconductors rather than mercury and phosphor.
Statement b: The average life span of a CFL is much longer than that of an LED lamp.
This statement is incorrect. LED lamps generally have a longer lifespan compared to CFLs. CFLs typically last for around 8,000 to 10,000 hours, while LED lamps can last for 25,000 to 50,000 hours or even longer, depending on the quality of the LED and how it is used. The longer lifespan of LED lamps is one of their key advantages over CFLs, as it reduces the frequency of replacement and maintenance.
Statement c: A CFL is less energy-efficient as compared to an LED lamp.
This statement is correct. CFLs are less energy-efficient compared to LED lamps. CFLs convert about 30% of the energy they consume into visible light, while the remaining 70% is lost as heat. On the other hand, LED lamps are much more energy-efficient, with an average conversion rate of 80-90%. They produce very little heat, making them more efficient in terms of energy consumption. LED lamps also have the advantage of being able to dim without losing efficiency, further contributing to their overall energy efficiency.
Conclusion:
Based on the analysis, statement a and c are correct. Therefore, option 'C' is the correct answer, which states that statement 1 and 3 only are correct.
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What is the difference between a CFL and an LED lamp?a) To produce lig...
Until recently, most homes used incandescent light bulbs. Incandescent bulbs emit light by generating heat. Unfortunately 90% of the power required to provide the desired brightness is emitted in heat rather than visible light. For this reason, incandescent bulbs are gradually being phased out, and in the United States will be banned entirely by 2014. CFLs have been touted enthusiastically in the past decade, but LEDs are beginning to surpass them because they require as little as half the power and last 10 times longer than a CFL. The table below contrasts the three technologies.
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What is the difference between a CFL and an LED lamp?a) To produce light, a CFL uses mercury vapour and phosphor while an LED lamp uses semiconductor material.b) The average life span of a CFL is much longer than that of an LED lamp.c) A CFL is less energy-efficient as compared to an LED lamp.Q.Which of the statements given above is/are correct?a)1 only.b)2 and 3 only.c)1 and 3 only.d)1, 2and 3.Correct answer is option 'C'. Can you explain this answer? for UPSC 2026 is part of UPSC preparation. The Question and answers have been prepared according to the UPSC exam syllabus. Information about What is the difference between a CFL and an LED lamp?a) To produce light, a CFL uses mercury vapour and phosphor while an LED lamp uses semiconductor material.b) The average life span of a CFL is much longer than that of an LED lamp.c) A CFL is less energy-efficient as compared to an LED lamp.Q.Which of the statements given above is/are correct?a)1 only.b)2 and 3 only.c)1 and 3 only.d)1, 2and 3.Correct answer is option 'C'. Can you explain this answer? covers all topics & solutions for UPSC 2026 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for What is the difference between a CFL and an LED lamp?a) To produce light, a CFL uses mercury vapour and phosphor while an LED lamp uses semiconductor material.b) The average life span of a CFL is much longer than that of an LED lamp.c) A CFL is less energy-efficient as compared to an LED lamp.Q.Which of the statements given above is/are correct?a)1 only.b)2 and 3 only.c)1 and 3 only.d)1, 2and 3.Correct answer is option 'C'. Can you explain this answer?.
What is the difference between a CFL and an LED lamp?a) To produce light, a CFL uses mercury vapour and phosphor while an LED lamp uses semiconductor material.b) The average life span of a CFL is much longer than that of an LED lamp.c) A CFL is less energy-efficient as compared to an LED lamp.Q.Which of the statements given above is/are correct?a)1 only.b)2 and 3 only.c)1 and 3 only.d)1, 2and 3.Correct answer is option 'C'. Can you explain this answer? for UPSC 2026 is part of UPSC preparation. The Question and answers have been prepared according to the UPSC exam syllabus. Information about What is the difference between a CFL and an LED lamp?a) To produce light, a CFL uses mercury vapour and phosphor while an LED lamp uses semiconductor material.b) The average life span of a CFL is much longer than that of an LED lamp.c) A CFL is less energy-efficient as compared to an LED lamp.Q.Which of the statements given above is/are correct?a)1 only.b)2 and 3 only.c)1 and 3 only.d)1, 2and 3.Correct answer is option 'C'. Can you explain this answer? covers all topics & solutions for UPSC 2026 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for What is the difference between a CFL and an LED lamp?a) To produce light, a CFL uses mercury vapour and phosphor while an LED lamp uses semiconductor material.b) The average life span of a CFL is much longer than that of an LED lamp.c) A CFL is less energy-efficient as compared to an LED lamp.Q.Which of the statements given above is/are correct?a)1 only.b)2 and 3 only.c)1 and 3 only.d)1, 2and 3.Correct answer is option 'C'. Can you explain this answer?.
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