light+upon
81Light pollution — This article is about light pollution in the visible spectrum. For information on pollution in the radio spectrum, see radio spectrum pollution. This time exposure photo of New York City at night shows skyglow, one form of light pollution …
82Light-emitting diode — LED redirects here. For other uses, see LED (disambiguation). Light emitting diode Red, pure green and blue LEDs of the 5mm diffused type Type Passive, optoelectronic Working principle Electr …
83light — 1 /laIt/ noun 1 NATURAL/ARTIFICIAL LIGHT a) (U) the energy from the sun, a flame, a lamp etc that allows you to see things: the morning light streaming in through the windows | We could see a tiny glimmer of light in the distance. |… …
84Light gun — A light gun is a pointing device for computers and a control device for arcade and video games. The first light guns appeared in the 1930s, following the development of light sensing vacuum tubes. It was not long before the technology began… …
85Light Division — The Light Division Active 1803 – 1815 1853 – 1856 1914 – 1918 1968 – 2007 Country Great Britain Branch British Army Type Light Infantry …
86Light rail in North America — The term light rail was coined in 1972 by the U.S. Urban Mass Transit Association (UMTA) to describe new streetcar transformations which were taking place in Europe and the United States. The Germans used the term stadtbahn to describe the… …
87light — I. /laɪt / (say luyt) noun 1. that which makes things visible, or affords illumination: all colours depend on light. 2. Physics a. Also, luminous energy, radiant energy. electromagnetic radiation to which the organs of sight react, ranging in… …
88Light-harvesting complex — A light harvesting complex is one or more polypeptide chains containing photosynthetic pigments, which surrounds a photosynthetic reaction centre and focuses energy, attained from photons absorbed by the pigment, inward toward the reaction centre …
89Light rail in the United States — The use of light rail in the United States is low by European standards. According to the American Public Transportation Authority, of the 20 odd light rail systems in the United States only five (Boston, San Francisco, Los Angeles, San Diego and …
90Light rail in Canada — In general, Canadian cities have rates of public transit use which are two to three times as high as comparably sized U.S. cities. Census data for 2006 show that 11.0% of Canadians use public transit to commute to work, compared to 4.8% of… …
