@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:t7-33.2>
  a isq:Entry ;
  rdf:type isq:Quantity ;
  rdf:type smart:TermEntry ;
  dcterms:identifier "7-33.2" ;
  skosxl:prefLabel "luminance factor"@en ;
  skosxl:altLabel "beta_\"v\""@en ;
  skosxl:altLabel "(beta)"@en ;
  skos:definition "quotient of the luminance of a surface element in a specified direction and the luminance of the perfect reflecting diffuser or perfect transmitting diffuser identically illuminated and viewed, expressed by\n\n[stem%unnumbered]\n++++\nbeta_\"v\" = (L_\"v,n\")/(L_\"v,d\")\n++++\n\nwhere stem:[L_\"v,n\"] is the luminance (<<t7-15>>) of a surface element in a given direction and stem:[L_\"v,d\"] is the luminance of the perfect reflecting or transmitting diffuser identically illuminated and viewed\n"@en ;
  smart:hasBindingnessType "bindingness-type:normative" ;
  dcterms:isPartOf <isq:part-7> ;
  isq:hasUnit [
    skos:notation "1" ;
    skosxl:prefLabel "one"@en
  ] ;
  skos:note "The definition holds for a surface element of a non-luminous medium, in a given direction and under specified conditions of irradiation.\n\nThis quantity is also defined spectrally and is called \"spectral luminance factor\".\n\nFor the analogous radiant quantity \"radiance factor\", see <<t7-33.1>>.\n"@en ;
  iso:urn <urn:iso:std:iso:80000:-7:ed-2:en:item:7-33.2> .