LEDs are becoming more commonly used due to being one of themost energy efficient and growing developments in lighting technology.

Thesebulbs last a lot longer, more heavy duty and have a better level of quality incomparison to other light sources. (Energy Saver, 2017). There are manyadvantages of using optical fibres over methods to communicate information isthe fact it can carry signals over longer distances and it can provide moreservices with just one line for example the transfer of data and computers. Theother advantage is the excellent security measures it provides for example youcan’t easily detect glass fibre as it makes it more difficult to tap into. (Teach ICT, 2017). Flat panel displayscreen takes up less space than a cathode ray tubes. In addition to this thereis less power used up with a flat panel display screen.

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Due to cathode raytubes being categorised as old technology this means the quality of the pictureisn’t as good as the quality of a flat panel display screen is brillianthowever it is dependent on quality and how much you are willing to spend. (Computer Hope, 2017).Electromagnetic waves can be polarised as they are light waves and they aretypes they can be called transverse waves. Light that is polarised is easier todescribe as it exists as transverse waves. Electromagnetic radiation is a typeof light which carries transverse waves and because of the vibrations are bothin the same direction and the direction of travel. (BBC Bitesize, 2017).LEDs areincreasingly replacing other types of energy as they can trap light, thereforethis reduces the need for devices such as reflectors. They also produce lessheat in comparison to CFLs which give out around 80% of their heat energy.

 (Energy Saving, 2017). The advantages ofusing LEDs include the visual quality for the user, the bulbs which are used area lot lighter and thinner in comparison to the LCD monitor which are bigger anda lot heavier and are not easy to mobilise. Due to production of LED monitorsthere is a more varied product portfolio and as a result there is been anincrease in choices which are feasible. (Online Sciences , 2017). The presentlimitations are the expense of LEDs, as they require a lot of power they aremore expensive compared to other light sources. They are also voltage sensitive, they must be a voltage supplied which is alsocostly. The biggest concern is the blue hazard.

The LEDs emit increasingamounts of blue light in comparison to other light sources used outside. As a result,this is causing more pollution. LEDs tend to overheat very easily and as aresult the light can carry many faults.

People that work in hospitals and inthe armed forces are not recommended to use LEDs as they are not 100% reliable. (Get Revising , 2017).LEDs are made by indium gallium nitride which gives the LED its brightness andgives the colour blue, ultraviolet and green. Another part is Aluminium galliumindium phosphide which gives red, orange and yellow colours. For the red andinfrared LEDs this is made up of Aluminium gallium arsenide and finally thegallium phosphide is used to make the yellow and green. (LED Magazine, 2017). LEDs emit a continuous spectrum, acontinuous spectrum is one wave length with no interruptions.

 (Enotes, 2017) Usually a blue lightis giving off and this can turn into other colours once the blue light isabsorbed. In the spectrum they produce single LEDs or are combined of phosphorsand other LEDs. (Globe at Night, 2017)