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luminous intensity |
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luminous intensity [′lü·mə·nəs in′ten·səd·ē] (optics) The luminous flux incident on a small surface which lies in a specified direction from a light source and is normal to this direction, divided by the solid angle (in steradians) which the surface subtends at the source of light. Also known as light intensity. Luminous intensity The solid angular luminous flux density in a given direction from a light source. It may be considered as the luminous flux on a small surface normal to the given direction, divided by the solid angle (in steradians) which the surface subtends at the source of light. Since the apex of a solid angle is a point, this concept applies exactly only to a point source. The size of the source, however, is often extremely small when compared with the distance from which it is observed, so in practice the luminous flux coming from such a source may be taken as coming from a point. See Candlepower, Photometry How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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| In order to improve the situation, NIST has investigated the technical problems and is developing standard LEDs and recommended measurement methods for luminous intensity, total luminous flux, and color (chromaticity and dominant wavelength). At night, the entire building lights up like a huge, free-form Japanese paper lantern, glowing with a softly luminous intensity. Available in Red, Amber and Red-Orange colors, Avago's new HLMP-Exxx series of 5 mm aluminum indium gallium phosphide (AllnGaP) LEDs are highly reliable and provide high luminous intensity with low forward voltage to meet the needs of designers who need a low-power lighting solution. |
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