06-05-2019, 10:36 AM
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]](http://frontdesk.co.in/wp-content/uploads/2019/06/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]](http://frontdesk.co.in/wp-content/uploads/2019/06/image-29.png)
Gas Discharge lamps
c) Solid State Lighting or LED lamps:
![[Image: image-31.png]](http://frontdesk.co.in/wp-content/uploads/2019/06/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/...hitecture/
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;
Incandescent lampsb) 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
Gas Discharge lampsc) Solid State Lighting or LED lamps:
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/...hitecture/