Light is a form of energy which our sense of sight can detect. It is made of electro-magnetic radiation and travels in a straight path. In everyday we use the word “light” for at least 10 times a day!! Have you ever think about the energy we get from the light. Light is all around us. It has the ability to tan or burn our skins, it can be harnessed to melt metals, or heat our food. Light energy posed a huge challenge for scientist up to the 1950′s.

Light Energy Pictures

Light Energy Pictures

Light Energy Pictures

Light Energy Pictures

Light energy Definition

  • Light energy refers to the electromagnetic energy that is visible to the human eye.

  • Light energy is energy that travels in straight lines called rays that fan outward from the source of the light. From the picture you can see how light energy travels in straight line.

  • Light energy is made of electro-magnetic radiation and travels in a straight path.


Example for Light energy

  • As shown in this picture, Light energy can be converted into chemical energy when the plants absorb the light energy; they convert it into chemical energy for their own nutrition.

  • Another real life example is the sun, the sun gives plants light energy which afterward is converted into chemical energy.

  • Even a burning candle shown in the picture is an example for light energy.


Sources of light energy

Some of the important and interesting sources of light energy are listed below,

  • Incandescence, source of light

  • Phosphorescence, source of light

  • Electric Discharge, source of light

  • Fluorescence, source of light

  • Chemiluminescence, source of light

  • Bioluminescence, source of light


Incandescence – light source

  • At high temperatures, luminous light sources begin to emit light.

  • The process of emitting light because of a high temperature is called incandescence.

  • incandescent light is shown in the below picture.


Phosphorescence – light source

  • Some  materials, called phosphors store the energy and then release it gradually as light energy.

  • The process of emitting light for some time after receiving energy from another source is called phosphorescence.

  • Phosphorescence light source can be seen in the picture shown here.


Electric Discharge – light source

  • When electricity passes through a gas, the gas particles can emit light. This process of emitting light because of electricity passing through a gas is called electric discharge.

  • Neon gas gives off a red - orange colour. Sodium vapour gives off a yellowish light. Other gases emit light of other colours.


Bioluminescence – light source

Some living things, such as the fish, can make themselves luminous using a chemical reaction similar to Chemiluminescence. This process is called Bioluminescence.

Steam energy


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