 | Cutler J. Cleveland, Christopher G. Morris - 2005 - 512 pages
...measurement for the flux of light produced by a light source or received by a surface. It is based on the spectral sensitivity of the photosensors in the...having a uniform luminous intensity of 1 candela. 264 Lurgi process lumen hour Lighting. a unit of quantity of light, equal to one lumen of light flux... | |
 | Cutler J. Cleveland - 2006 - 526 pages
...measurement for the flux of light produced by a light source or received by a surface. It is based on the spectral sensitivity of the photosensors in the...having a uniform luminous intensity of 1 candela. lumen depreciation Lighting, the gradual loss of efficacy (lumen output) of a lamp over time, typically... | |
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It is based on the spectral sensitivity of the photosensors in the human eye under high (daytime) light levels. Photometrically, it is the luminous flux emitted with a solid angle (1 steradian) by a point source having a uniform luminous intensity of... 