LEDs are becoming more commonly used due to being one of the
most energy efficient and growing developments in lighting technology. These
bulbs last a lot longer, more heavy duty and have a better level of quality in
comparison to other light sources. (Energy Saver, 2017). There are many
advantages of using optical fibres over methods to communicate information is
the fact it can carry signals over longer distances and it can provide more
services with just one line for example the transfer of data and computers. The
other advantage is the excellent security measures it provides for example you
can’t easily detect glass fibre as it makes it more difficult to tap into. (Teach ICT, 2017). Flat panel display
screen takes up less space than a cathode ray tubes. In addition to this there
is less power used up with a flat panel display screen. Due to cathode ray
tubes being categorised as old technology this means the quality of the picture
isn’t as good as the quality of a flat panel display screen is brilliant
however 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 are
types they can be called transverse waves. Light that is polarised is easier to
describe as it exists as transverse waves. Electromagnetic radiation is a type
of light which carries transverse waves and because of the vibrations are both
in the same direction and the direction of travel. (BBC Bitesize,

LEDs are
increasingly replacing other types of energy as they can trap light, therefore
this reduces the need for devices such as reflectors. They also produce less
heat in comparison to CFLs which give out around 80% of their heat energy. (Energy Saving, 2017). The advantages of
using LEDs include the visual quality for the user, the bulbs which are used are
a lot lighter and thinner in comparison to the LCD monitor which are bigger and
a lot heavier and are not easy to mobilise. Due to production of LED monitors
there is a more varied product portfolio and as a result there is been an
increase in choices which are feasible. (Online Sciences , 2017). The present
limitations are the expense of LEDs, as they require a lot of power they are
more expensive compared to other light sources.
They are also voltage sensitive, they must be a voltage supplied which is also
costly. The biggest concern is the blue hazard. The LEDs emit increasing
amounts 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 a
result the light can carry many faults. People that work in hospitals and in
the 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 and
gives the colour blue, ultraviolet and green. Another part is Aluminium gallium
indium phosphide which gives red, orange and yellow colours. For the red and
infrared LEDs this is made up of Aluminium gallium arsenide and finally the
gallium phosphide is used to make the yellow and green. (LED Magazine, 2017). LEDs emit a continuous spectrum, a
continuous spectrum is one wave length with no interruptions. (Enotes, 2017) Usually a blue light
is giving off and this can turn into other colours once the blue light is
absorbed. In the spectrum they produce single LEDs or are combined of phosphors
and other LEDs. (Globe at Night, 2017)

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