Spaceflight Essay

1126 words - 5 pages

Mayadagli 5Tegin Yucel MayadagliProfessor Ellen RamseyENG 101July 30, 2014I am About Change My LampMore than 150 years ago, inventors began working on a bright idea that would have a dramatic impact on how we use energy in our homes and offices. This invention changed the way we design buildings, increased the length of the average workday and jumpstarted new businesses. It also led to new energy breakthroughs from power plants and electric transmission lines to home appliances and electric motors. Like all great inventions, the light bulb, called incandescent bulb, can't be credited to one inventor. It was a series of small improvements on the ideas of previous inventors that have led to the light bulbs which we use in our homes. The light bulb was a great idea, but researchers have never found a way to increase its efficiency more than 10% and began to focus on other lighting solutions. In early 1900s, they discovered another method to produce light that was totally different than the light bulb. They could produce light by removing almost all of the air from a long glass tube and passing an electrical current through it, an invention that became known as the Geissler tube. This was a kind of discharge lamp and was called fluorescent lamp. When the oil crisis came up in 1973, scientists had to develop efficiency of the fluorescent lamp for residential applications due to energy shortage that we still use in our homes.While the fluorescent lamps were on the market as a lighting device, the light emitting diode (LED) began appearing as indicator lights and calculator displays in the 1970s. The invention of the blue diode in the 1990s quickly led to the discovery of white LEDs. To make LEDs an option for general lighting, researchers focused on improving the efficiency of LEDs which in the beginning were no more efficient than incandescent bulbs. In 2000, they succeeded to create a high-efficiency device that packaged LEDs together. Today, we have more than one choice on lighting, such as incandescent bulbs, fluorescent lamps, and LEDs, but fluorescent and LED lamps are more popular on the market. However, there are a great many differences between LED and fluorescent lighting that include lifespan, energy consumption, and efficiency.Since light emitting diode is a semiconductor device, color of the LED depends on the energy band gap of the semiconductor which is used to make the LED, and the band gap of the semiconductor allows emitting only one wavelength which means a single color. To emit white color from a LED requires mixing red, green, and blue lights or using a phosphor layer, which is the most common way, in order to convert some of the light to white color. Thanks to the phosphor layer, white LED lamps have longer life expectancy and higher efficiency. LED light emission tends to be directional, which can be either advantageous or disadvantageous, depending on requirements. For applications where non-directional light is required, either...

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