What is the difference between a CFL and a LED lamp? 1. To produce light, a CFL uses mercury vapour and phosphor while an LED lamp uses semiconductor material. 2. The average lifespan of a CFL is much longer than that of a LED lamp. 3. A CFL is less energy efficient as compared to an LED lamp.

2011

PhysicsXLight energy, Science and Technology

What is the difference between a CFL and a LED lamp? 1. To produce light, a CFL uses mercury vapour and phosphor while an LED lamp uses semiconductor material. 2. The average lifespan of a CFL is much longer than that of a LED lamp. 3. A CFL is less energy efficient as compared to an LED lamp.

(a)

1 only

(b)

2 and 3 only

(c)

1 and 3 only

(d)

1, 2 and 3

Answer:

(c)

Explanation

CFLs use mercury vapour and phosphor, LEDs use semiconductor material; LEDs have a longer lifespan and are more energy-efficient than CFLs.