Learn the basics of Electrical Engineering.

Basics of Compact Fluorescent Lamp (CFL Tubes)

CFL or Compact fluorescent is a popular lightning source. Today you'll learn:
  1. What is CFL and why it is named so
  2. Construction and working of CFL
  3. Lumens
  4. CFL vs Incandescent Lamp
  5. CFL vs LED Lamp

What is CFL and why it is named so

CFL is a low-pressure mercury vapor gas lamp which uses the phenomenon of fluorescence to produce light.
Fluorescence itself is defined as the emission of light by an object which has absorbed some light or electromagnetic radiation.

Construction of CFL

The internal surface of CFL is coated with a thin layer of phosphor. The internal side of lamp contains a small amount of mercury vapor and an inert gas such as argon, krypton or neon. The tube contains two tungsten electrodes. These electrodes are connected to the electrical circuit.
The video below illustrates the working of CFL:


The total quantity of visible light emitted through any source is measured in terms of lumens. Technically lumens is defined as the amount of light which is provided through a solid angle by a source of one-candela intensity radiating equally in all directions.

CFL vs Incandescent Lamp
Compared to an incandescent lamp, a CFL is more efficient. To produce 800 lumens the required CFL takes around 15-watt. Whereas an incandescent lamp takes 60-watts.

CFL vs LED Lamp
LED lamps are more efficient as compared to CFL. Generally, a 10 watt LED Lamp can produce 800 watts.

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