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Untitled Prezi

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by

Bob Lyrik

on 6 May 2013

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Transcript of Untitled Prezi

By David White and Aaron Gates Evolution of Man-Made Lighting The Torch The torch was the original man made light made by lighting a piece of wood on fire The Lightbulb The lightbulb was invented in 1879 by Thomas Alva Edison LED The LED is one of the latest man-made lights. It is made by This source was developed by Fusion Lighting (USA) in 1994 It was very simple so it was used in prehistoric times An electric lamp is when a light is made by a filament being heated to incandescence by an electric current. Today's incandescent light bulbs use filaments made of tungsten rather than carbon of the 1880's. http://www.ideafinder.com/history/inventions/lightbulb.htm A light-emitting diode (LED) is a semiconductor light source that can shine very bright to very dim. Sulfur Lamp About the size of a golf ball, the sulfur lamp consists of a quartz bulb containing non-toxic sulfur and inert argon gas at the end of a thin glass stick. A microwave energy source of 2.45 Ghz. (magnetron) bombards the lamp while a fan cooled motor spins the lamp at 3400 rpm. The microwave energy excites the gas, which heats the sulfur, forming a brightly glowing plasma that can illuminate a very large area. http://www.ffcrafts.com/news/MAN-MADE-LIGHT-SOURCES--LIGHTING-HISTORY-4118.html LED The LED is one of the latest man-made lights. It is made by A light-emitting diode (LED) is a semiconductor light source that can shine very bright to very dim. LED The LED is one of the latest man-made lights. It is made by A light-emitting diode (LED) is a semiconductor light source that can shine very bright to very dim.
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