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1) "Ansi" -- As to ansi lumens ANSI Function: abbreviation American National Standards Institute Pronunciation Symbols The American National Standards Institute or ANSI (IPA pronunciation: [ænsiː]) is a private nonprofit organization that oversees the development of voluntary consensus standards for products, services, processes, systems, and personnel in the United States. The organization also coordinates U.S. standards with international standards so that American products can be used worldwide. For example, standards make sure that people who own cameras can find the film they need for them anywhere around the globe. ANSI accredits standards that are developed by representatives of standards developing organizations, government agencies, consumer groups, companies, and others. These standards ensure that the characteristics and performance of products are consistent, that people use the same definitions and terms, and that products are tested the same way. ANSI also accredits organizations that carry out product or personnel certification in accordance with requirements defined in international standards. The organization's headquarters are in Washington, DC. ANSI's operations office is located in New York City. - 1 History
- 2 Members
- 3 The ANSI Process
- 4 Involvement in International Standards Activities
- 5 Examples of Standardization Activities Under the ANSI Umbrella
- 6 Trivia
- 7 References
- 8 See also
- 9 External links
| ANSI was formed in 1918 when five engineering societies and three government agencies founded the American Engineering Standards Committee (AESC). The AESC became the American Standards Association (ASA) in 1928. In 1966, the ASA was reorganized and became the United States of America Standards Insti..."
2) "Lumens" -- As to ansi lumens lumen Pronunciation: 'lü-m&n Function: noun Inflected Form(s): plural lumens also lumina /-m&-n&/ Etymology: New Latin lumin-, lumen, from Latin, light, air shaft, opening 1 : the cavity of a tubular organ or part <the lumen of a blood vessel> 2 : the bore of a tube (as of a hollow needle or catheter) 3 : a unit of luminous flux equal to the light emitted in a unit solid angle by a uniform point source of one candle intensity - luminal also lumenal /-m&-n&l/ adjective Pronunciation Symbols The lumen (symbol: lm) is the SI unit of luminous flux, a measure of the perceived power of light. Luminous flux differs from radiant flux, the measure of the total power of light emitted, in that luminous flux is adjusted to reflect the varying sensitivity of the human eye to different wavelengths of light. - 1 Definition
- 2 Explanation
- 3 ANSI lumens
- 4 SI photometry units
- 5 See also
- 6 References
| 1 lm = 1 cd·sr = 1 cd·m2·m–2 If a light source emits one candela of luminous intensity into a solid angle of one steradian, the total luminous flux emitted into that solid angle is one lumen. Alternatively, an isotropic one-candela light source emits a total luminous flux of exactly 4π lumens. The lumen can be thought of casually as a measure of the total "amount" of visible light emitted. A standard 100 watt incandescent light bulb emits approximately 1700 lumens. See luminous efficacy for the specific efficiency of various types of electric light sources. The light output of projectors (including video projectors) is typically measured in lumens. A standardized procedure for testing projectors has been established by the American National Standards Institute, which involves averaging together several measurements taken at different positions.[1] For marketing purposes, the luminous flux of projectors that have been tested according to this procedure may be quoted in "ANSI lumens", to distinguish devices that have been so tested from those tested by other methods. ANSI lumen measurements are in general more accurate than the other measurement techniques used in the projector industry.
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