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What is the Difference Between a CFL and an LED lamp?

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 semiconductor 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 statements given above is/are correct?(2011)

a) 1 only

b) 2 and 3 only

c) 1 and 3 only

d) 1, 2 and 3