 | Richard Glazebrook - 1923 - 932 pages
...of a surface is the surface-density of the luminous flux at that point or the quotient of the flux by the area of the surface, when the latter is uniformly illuminated. * (vii.) The Practical Unit of Illumination is the Lux, It is the illumination of a surface one square... | |
 | 1998 - 686 pages
...capacity either exceeds 10 Btu/h»ft2 or is capable of maintaining a space dry-bulb temperature of 50 °F or more at design building conditions. Heating System...hot water energy load requirements of the building. 10 CFß Ch. Il (1-1-98 Edition) Infiltration means the uncontrolled inward air leakage through cracks... | |
 | United States. Federal Highway Administration. Office of Traffic Operations - 1978 - 268 pages
...pressure of the vapor during operation is of the order of 10'* N • m"2 (0.1 atmosphere). illumination: the density of the luminous flux incident on a surface; it is the quotient of the luminous flux by the area of the surface when the latter is uniformly illuminated. Note: The term illumination also... | |
 | 1989 - 154 pages
...sources and the luminance to which the eyes are adapted. Illuninance - The density of the luminance flux incident on a surface; it is the quotient of the luminous flux by the area of the surface when the latter is uniformly illuminated. The unit of measurement is the... | |
 | Rudolf F. Graf - 1999 - 540 pages
...projected area; it is the photometric counterpart of irradiance and is expressed in footcandles. 2. The density of the luminous flux incident on a surface; it is the quotient of the luminous flux by the area of the surface, when the latter is uniformly illuminated (SI unit = lux or Ix). 3. The... | |
 | United States. Federal Aviation Administration - 19?? - 252 pages
...the penetration of hydrogen into the metal. Chap 5 IES: Illumination Engineering Society ILLUMINANCE: The density of the luminous flux incident on a surface; it is the quotient of the luminous flux divided by the area of the surface when the latter is uniformly illuminated. Typical units are footcandles... | |
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... the density of the luminous flux incident on a surface; it is the quotient of the luminous flux by the area of the surface when the latter is uniformly illuminated. 