Incandescent Electric Lamp

Write any two advantages of Light Emitting Diode (LED) over conventional incandescent low power lamps .

Give any one advantage of LEDs over conventional incandescent low power lamps

Give any one advantage of LEDs over conventional incandescent low power lamps

How is a light emitting diode fabricated ? Briefly state is working. Write any two important advantages of LEDs over the conventional incandescent low power lamps.

Indiscriminate disposal of used fluorescent electric lamps causes mercury pollution in the environment. Why is the mercury used in the manufacture of these lamps ?