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Compact fluorescent bulbs are widely used because they use one fifth of the electric power to provide the same amount of light as an incandescent bulb.

Incandescent: 12 lumens per watt

Halogen: 15 lumens per watt

CFL: 50-60 lumens per watt

LED: 100 lumens per watt

High-pressure sodium: 200 lumens per watt

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Q: Why cfl is widely used nowadays?
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