One thing that plays a major role in human life is light
source. In the beginning of time there where was only the sun to rely on. Then
there came the control of fire by humans. The control of fire originated from change
in habitat, a drier climate, next was the interface with these burned lands as
some wildlife would be caught up in the fire. Then, was the idea to make use of
these fires. One example being that some foods in the wildfires tended to be under
cooked or burned, this gave them incentive to place undercooked foods in the
fire. From this is shows that they had knowledge with fire and its behavior.
Once they had this familiarity they were able to develop methods of transporting
fire, providing them advantages in getting food. The control of fire had a huge
impact on the future of lighting. As early as 200 BC came the first wick. The Prehistoric
man used natural non-flammable materials such as shells, rocks and stones will
some grease and a fiber wick to create these sources of light. Often, they were
fueled by vegetable of animal fats. The next major advancement was gas and
electric lamps. In 1790 England was the first to develop gas lighting, which
was soon introduced to America. Then a few years later it was used to fuel
major cities street lighting. Some gasses that were used were methane,
acetylene, butane, propane, hydrogen, and natural gas. Next came electric lamps
that was created by Humphry Davey. Later, an American inventor Thomas Edison developed
the incandescent light which burned for 13 and a half hours. A revolutionary
advancement that would be the prominent power source of lighting indoors and
out. As human intelligence became more complex so did their inventions. Daniel
McFarlan Moore introduced the fluorescent light in 1904. They had a much higher
efficiency but used high voltage. A manufacturer (General Electric) was able to
improve their technology by the discovery of the tungsten filament. An inventor
Peter Cooper Hewitt developed a high efficiency mercury vapor light, that was
also well-suited with standard electrical infrastructure. Upon the most recent
evolution came the 20th Century high intensity discharge (HID) lamps.
These all function using similar technology which involves sending an
electrical current between two metal electrodes and through a glass tube filled
with inert gas resulting in the emission of visible light. Which is now used across
the globe generating tons of light source. 

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