What is the difference between a CFL and an LED lamp?
- To produce light, a CFL uses mercury vapour and phosphor while an LED lamp uses semi-conductor material.
- The average life span of a CFL is much longer than that of an LED lamp.
- A CFL is less energy-efficient as compared to an LED lamp.
Which of the statement(s) given above is/are correct?
[UPSC Civil Services Exam – 2011 Prelims]
(a) 1 only
(b) 2 and 3 only
(c) 1 and 3 only
(d) 1, 2 and 3
- The primary difference between the CFL and LED bulb is that LED bulbs are more durable and has a long life. Hence, statement 2 is incorrect.
- LED bulbs are much more efficient than CFL bulbs. Hence, statement 3 is correct.
- The main semiconductor materials used to manufacture LEDs are:
- Indium gallium nitride (InGaN): blue, green, and ultraviolet high-brightness LEDs.
- Aluminium gallium indium phosphide (AlGaInP): yellow, orange, and red high-brightness LEDs.
- Aluminium gallium arsenide (AlGaAs): red and infrared LEDs. Hence, statement 1 is correct.