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Lumen method. In lighting design, the lumen method, (also called zonal cavity method ), is a simplified method to calculate the light level in a room. The method is a series of calculations that uses horizontal illuminance criteria to establish a uniform luminaire layout in a space. In its simplest form, the lumen method is merely the total ...
Table lamp c. 1900–1906. A Tiffany lamp is a type of lamp made of glass and shade designed by Louis Comfort Tiffany or artisans, mostly women, and made (in originals) in his design studio. The glass in the lampshades is put together with the copper-foil technique instead of leaded, the classic technique for stained-glass windows.
Gas lamps gradually started replacing oil street lamps in the United States, beginning in the first quarter of the 19th century. [ 3] The first street in the world to be illuminated by gaslight was Pall Mall in London, starting in 1807. [ 1][ 5] The first US city to use gas street lights was Baltimore, starting in 1817. [ 4]
Sustainable lighting. [1] [2] Sustainable lighting is lighting designed with energy efficient light sources. "There are simple design strategies and some materials that can facilitate the energy saving advantages of natural light. Light colored interiors and open floor plans are good choices. This approach also augments artificial light efficiency.
A chandelier in Genoa, Italy. A chandelier ( / ˌʃændəˈlɪər /) is an ornamental lighting device, typically with spreading branched supports for multiple lights, designed to be hung from the ceiling. [ 1 ][ 2 ] Chandeliers are often ornate, and they were originally designed to hold candles, but now incandescent light bulbs are commonly ...
Reference ballast operates the lamp at its ANSI specified nominal power rating. [9] [10] The ballast factor of practical ballasts must be considered in lighting design; a low ballast factor may save energy, but will produce less light and short the lamp life. With fluorescent lamps, ballast factor can vary from the reference value of 1.0. [11]
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