@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:t7-6.1>
  a isq:Entry ;
  rdf:type isq:Quantity ;
  rdf:type smart:TermEntry ;
  dcterms:identifier "7-6.1" ;
  skosxl:prefLabel "radiance"@en ;
  skosxl:altLabel "L_\"e\""@en ;
  skosxl:altLabel "(L)"@en ;
  skos:definition "density of radiant 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_\"e\" = (\"d\"l_\"e\")/(\"d\"A) 1/(\"cos\"alpha)\n++++\n\nwhere stem:[I_\"e\"] is radiant intensity (<<t7-5.1>>), 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 "W/(sr*m^2)" ;
    skosxl:prefLabel "watt per steradian square metre"@en
  ] ;
  isq:hasUnit [
    skos:notation "kg*s^(-3)*sr^(-1)" ;
    skosxl:prefLabel "kilogram per second cubed steradian"@en
  ] ;
  skos:note "See also <<cls-0.1>>.\n\nFor Planckian radiation,\n\n[stem%unnumbered]\n++++\nL_\"e\" = sigma/pi T^4\n++++\n\nwhere stem:[T] is thermodynamic temperature (<<iso80000-5>>) and stem:[sigma] is the Stefan-Boltzmann constant (<<iso80000-1>>).\n\nThe corresponding photometric quantity is \"luminance\" (<<t7-15>>). The corresponding quantity for photons is \"photon radiance\" (<<t7-22>>).\n"@en ;
  iso:urn <urn:iso:std:iso:80000:-7:ed-2:en:item:7-6.1> .