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Types of Bulbs

6/27/2012 4:27:53 PM | by Anonymous


Light bulbs have been present in the world for a very long time now, and have become very important parts of the modern day society. There are a variety of light bulbs in the market today that have been manufactured to meet different needs of people or applications. From their invention to now, light bulbs have gone through several changes and modifications and now come in a wide variety, using different technologies to suit the needs of the user. All light bulbs require electricity to function. Voltage measures the strength of the flow of electricity through a bulb, current refers to the rate that electricity flows through the bulb and resistance is how much space the current has to pass through. These factors affect the performance of the light bulb.


Incandescent bulbs

One of the earliest types of light bulbs invented, incandescent light bulbs are the most common types of light bulbs that most people would be familiar with. These bulbs work on the basis of a tungsten filament being heated by electricity until it glows to provide light. The glass that contains this filament can either be in a vacuum or a mixture of argon and nitrogen gas. Much of the energy that these bulbs consume is given off as heat and due to the high temperatures of the filament, the tungsten tends to evaporate and collect on the sides of the bulb, thus causing the filament to become thinner unevenly overtime. Due to this, when the bulb is turned on and the filament faces a sudden surge of electricity, the thinner areas would heat up faster than the thicker areas which would cause the filament to break. This act is referred to as the bulb burning out. Although these bulbs can produce a steady warm light that is ideal for most household applications, they tend to consume a lot of energy as compared to the other types of bulbs present in the market. They also do not have a long life span as they only last for an average of 700 to 1000 hours.


Halogen bulbs

These bulbs work on the same principle of incandescent bulb technology which is using electricity to heat a filament to provide light. The difference with these bulbs is that the tube which contains the filament is filled with halogen gas. The gas causes a chemical reaction that causes the evaporated tungsten to be removed from the walls of the tube and be deposited back on the filament. This reaction is able to extend the life of the bulbs as the tungsten would not burn out that easily. In order for this chemical reaction to occur, the filament of the bulb has to be hotter as compared to incandescent bulbs which cause the tungsten to evaporate at a faster rate. To over come this, a more expensive gas (krypton) and a higher pressure in a smaller glass bulb can be used to slow down the evaporation. However, these additional items would translate to a higher cost of the bulb. Despite the negatives, these bulbs are able to provide extremely luminous light which is more efficient.


Fluorescent bulbs

These bulbs function on the basis of passing a current through a tube that is filled with argon gas and mercury. This action produces ultraviolet radiation which bombards the phosphorous coating of the tube that eventually causes it to emit light. The life of these bulbs is very long ranging from 10,000 to 20, 000 hours. These bulbs are also very efficient as they do not produce much heat and can come in a variety of colours. They can be used to light large areas where detail work has to be done such as basements and storage lockets etc. These bulbs have seen an increase in demand lately as they decrease energy consumption and reduce electricity bill whilst still providing luminous lighting.

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