Why use halogen lamps ?

Article Written By: Scott Rodgers

A variety of lamps are used for home lighting and halogen lamps are one of these. Although they aren't more energy efficient than halogen lamps when used at home, they do last longer. And any energy saving that occurs through using them happens at their manufacturing as fewer need to be produced than incandescent bulbs as they have longer lifespan.

Incandescent lamps and halogen lamps aren't so different from one another. A tungsten filament, a base with contact points and a glass cover are common to both of them. A quartz casing surrounding the tungsten filament isn't however a feature of regular incandescent bulbs.

This quartz chamber contains an inert gas along with some quantity of a halogen gas, usually chlorine or iodine. In an incandescent bulb, when the tungsten filament glows, it produces tungsten vapor, which settles on the surface of the glass. It is because of this that the filament wears out and breaks in time.

The function of the halogen gas is to stop this happening. When tungsten vapor is produced, halides are formed. When halides settle on the filament, tungsten and halogen are recycled because they are separated by the heat. So because of this, tungsten filament takes longer to break and therefore the lamp itself lasts much longer.

The quartz envelope, which can withstand a lot more heat than glass, and the recycling of tungsten mean that the filament can now be heated to higher temperatures thereby producing more light when more electricity is supplied. But when this is done, the life of the bulb itself reduces because more tungsten vapor is produced than there is halogen gas to condense it.

Tungsten doesn't collect on the surface of the glass bulb when it works at the correct voltage. So the luminous efficiency of the bulb remains constant through most of its life. But no energy savings are made while using halogen lamps because they have a tungsten filament from which more heat is generated than light.

Halogen bulbs are usually used within grilles, as they can get really hot, as there isn't much gap between the glass body, the quartz casing and the tungsten filament. They are thus supposed to be put behind grilles according to some local codes to prevent fires.

Contamination on the glass cover of the lamp in the form of even fingerprints is dangerous and heat can concentrate in that area causing the quartz to become weaker and leak gas then form a bubble and finally explode. It should therefore be handled with a paper towel and cleaned with ethanol if it gets dirty.

About the Author

Scott Rodgers is an author with a lot of experience in electricians work all over the country. His exemplary guidance has generated business opportunities for a lot many Springfield electricians and Flint electricians.

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This Article Has Been Published on Mon, 17 Jan 2011 and Read 266 Times

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