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Science - chemistry

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 mach 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 ? 


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