@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:t7-22>
  a isq:Entry ;
  rdf:type isq:Quantity ;
  rdf:type smart:TermEntry ;
  dcterms:identifier "7-22" ;
  skosxl:prefLabel "photon radiance"@en ;
  skosxl:altLabel "L_\"p\""@en ;
  skosxl:altLabel "(L)"@en ;
  skos:definition "density of photon 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_\"p\" = (\"d\"I_\"p\")/(\"d\"A) 1/(\"cos\"alpha)\n++++\n\nwhere stem:[I_\"p\"] is photon intensity (<<t7-21>>), stem:[A] is area (<<iso80000-3>>) and stem:[alpha] 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 "m^(-2)*s^(-1)*sr^(-1)" ;
    skosxl:prefLabel "per square metre second steradian"@en
  ] ;
  skos:note "The corresponding radiometric quantity is \"radiance\" (<<t7-6.1>>). The corresponding photometric quantity is \"luminance\" (<<t7-15>>)."@en ;
  iso:urn <urn:iso:std:iso:80000:-7:ed-2:en:item:7-22> .