why led more efficient than cfl are and what are they made of?
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LED is different from CL because in CFL emission of light is because of ionization of mercury vapour. the mercury vapour when ionize produce ultra violet rays ,these rays when collide with phosphorus coating tube generates visible light.
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LED bulbs require much less wattage than CFL or Incandescent light bulbs, which is why LEDs are more energy-efficient and longer lasting than their competitors. The lower the wattage needed, the better.
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