Red and yellow-green light emitting diodes(LEDs)had already been developed, but there was intense international competition in the U.S., Europe and other countries to develop one other type-the blue LED. A blue diode was finally developed and commercialized in 1993, by Shuji Nakamura of the Nichia Corporation. LED light is governed by the additive color model which applies, for example, when three colors of light(red, green, and blue)are projected onto a screen using three projectors. The development of the blue type enabled LEDs to produce the three primary colors of red, green, and blue, and new lighting fixtures employing LEDs began to appear in the lighting industry. Some said the blue LED would not be developed in the 20th century, and its invention was an event which amazed people throughout the world. The blue LED made it possible to produce all colors by combining three colors, and some believe that in two or three years production of incandescent and fluorescent lights will cease, and the market will shift entirely to LEDs. In this research, illuminance is measured for three types of conventional lighting fixtures and two types of LED lighting fixtures. Parameters such as total luminous flux and power consumption of each lighting fixture are found from those values, and then brightness, glare, other optical characteristics, and energy conservation performance are measured and analyzed
