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Artificial light sources: Classification of lamps - Printable Version

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Artificial light sources: Classification of lamps - harshita - 06-05-2019

Artificial light sources: Classification of lamps

a) Incandescent lamps: 
In these the light comes from a heated metal wire. 
The halogen lamp contains a special gas to improve the efficacy. These types are widely used, but will be phased out in the coming years due to their low efficacy;


[Image: image-30.png]Incandescent lamps

b) Gas Discharge lamps: 
The light from these lamps, comes from a discharge between two electrodes in a gas tilled glass or ceramic tube. There are two ranges depending on the most important gas , mercury or sodium. Both these ranges can be subdivided by the pressure in the glass tube: high or low pressure
[Image: image-29.png]Gas Discharge lamps
c) Solid State Lighting or LED lamps:
[Image: image-31.png]Solid State Lighting or LED lamps:
 An LED is a semiconductor device. When a current is passed through an LED, electrons move through the semiconductor material and some of them fall into a lower energy state . In the process, the ‘spare ‘ energy is emitted as light.


To know more about illumination read .... http://frontdesk.co.in/building-science/illumination-in-architecture/