@prefix isq: <https://w3id.org/standards/isq/ontologies/core/> .
@prefix smart: <https://example.org/smart-sdu/> .
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix dcterms: <http://purl.org/dc/terms/> .
@prefix skos: <http://www.w3.org/2004/02/skos/core#> .

<isq:t7-15>
  a isq:Entry ;
  rdf:type isq:Quantity ;
  rdf:type smart:TermEntry ;
  dcterms:identifier "7-15" ;
  skosxl:prefLabel "luminance"@en ;
  skosxl:altLabel "L_\"v\""@en ;
  skosxl:altLabel "(L)"@en ;
  skos:definition "density of luminous intensity with respect to projected area in a specified direction at a specified point on a real or imaginary surface, expressed by\n\n[stem%unnumbered]\n++++\nL_\"v\" = (\"d\"I_\"v\")/(\"d\"A) 1/(\"cos\"alpha)\n++++\n\nwhere stem:[I_\"v\"] is luminous intensity (<<t7-14>>), stem:[A] is area (<<iso80000-3>>) and stem:[alpha] is the angle between the normal to the surface at the specified point and the specified direction\n"@en ;
  smart:hasBindingnessType "bindingness-type:normative" ;
  dcterms:isPartOf <isq:part-7> ;
  isq:hasUnit [
    skos:notation "cd*m^(-2)" ;
    skosxl:prefLabel "candela per square metre"@en
  ] ;
  skos:note "Luminance can be derived from the spectral radiance distribution by\n\n[stem%unnumbered]\n++++\nL_\"v\" = K_\"m\" int_0^(oo) L_(\"e\",lambda)(lambda)V(lambda)\"d\"lambda\n++++\n\nwhere stem:[K_\"m\"] is maximum luminous efficacy (<<t7-11.3>>), stem:[L_(\"e\",lambda)(lambda)] is the spectral radiance (<<t7-6.2>>) at wavelength stem:[lambda] (<<iso80000-3>>), and stem:[V(lambda)] is spectral luminous efficiency (<<t7-10.2>>). See also <<cls-0.1>>.\n\nIntegral limits can be confined depending on the spectral sensitivity of the detectors used as a sensor.\n\nThe corresponding radiometric quantity is \"radiance\" (<<t7-6.1>>). The corresponding quantity for photons is \"photon radiance\" (<<t7-22>>).\n"@en ;
  iso:urn <urn:iso:std:iso:80000:-7:ed-2:en:item:7-15> .