@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:t7-13>
  a isq:Entry ;
  rdf:type isq:Quantity ;
  rdf:type smart:TermEntry ;
  dcterms:identifier "7-13" ;
  skosxl:prefLabel "luminous flux"@en ;
  skosxl:altLabel "Phi_\"v\""@en ;
  skosxl:altLabel "(Phi)"@en ;
  skos:definition "change in luminous energy with time, expressed by\n\n[stem%unnumbered]\n++++\nPhi_\"v\" = (\"d\"Q_\"v\")/(\"d\"t)\n++++\n\nwhere stem:[Q_\"v\"] is the luminous energy (<<t7-12>>) emitted, transferred or received and stem:[t] is time (<<iso80000-3>>)\n"@en ;
  smart:hasBindingnessType "bindingness-type:normative" ;
  dcterms:isPartOf <isq:part-7> ;
  isq:hasUnit [
    skos:notation "lm" ;
    skosxl:prefLabel "lumen"@en
  ] ;
  isq:hasUnit [
    skos:notation "cd*sr" ;
    skosxl:prefLabel "candela steradian"@en
  ] ;
  skos:note "Luminous flux is a quantity derived from the radiant flux (<<t7-4.1>>), stem:[Phi_\"e\"], by evaluating the radiation according to its action upon the CIE standard photometric observer. (See <<cie017,locality:term=17-738>>.)\n\nLuminous flux can be derived from the spectral radiant flux distribution by\n\n[stem%unnumbered]\n++++\nPhi_\"v\" = K_\"m\" int_0^(oo) Phi_(\"e\",lambda)(lambda)V(lambda) \"d\"lambda\n++++\n\nwhere stem:[K_\"m\"] is maximum luminous efficacy (<<t7-11.3>>), stem:[Phi_(\"e\",lambda)(lambda)] is spectral radiant flux (<<t7-4.2>>), stem:[V(lambda)] is spectral luminous efficiency (<<t7-10.2>>) and stem:[lambda] is wavelength (<<iso80000-3>>).\n\nThe corresponding radiometric quantity is \"radiant flux\" (<<t7-4.1>>). The corresponding quantity for photons is \"photon flux\" (<<t7-20>>).\n"@en ;
  iso:urn <urn:iso:std:iso:80000:-7:ed-2:en:item:7-13> .