@prefix isq: .
@prefix smart: .
@prefix rdf: .
@prefix dcterms: .
@prefix skos: .
a isq:Entry ;
rdf:type isq:Quantity ;
rdf:type smart:TermEntry ;
dcterms:identifier "7-14" ;
skosxl:prefLabel "luminous intensity"@en ;
skosxl:altLabel "I_\"v\""@en ;
skosxl:altLabel "(I)"@en ;
skos:definition "density of luminous flux with respect to solid angle in a specified direction, expressed by\n\n[stem%unnumbered]\n++++\nI_\"v\" = (\"d\"Phi_\"v\")/(\"d\"Omega)\n++++\n\nwhere stem:[Phi_\"v\"] is the luminous flux (<>) emitted in a specified direction, and stem:[Omega] is the solid angle (<>) containing that direction\n"@en ;
smart:hasBindingnessType "bindingness-type:normative" ;
dcterms:isPartOf ;
isq:hasUnit [
skos:notation "cd" ;
skosxl:prefLabel "candela"@en
] ;
skos:note "The definition holds strictly only for a point source.\n\nThe distribution of the luminous intensities as a function of the direction of emission, e.g. given by the polar angles stem:[(vartheta,varphi)], is used to determine the luminous flux (<>) within a certain solid angle (<>) stem:[Omega] of a source:\n\n[stem%unnumbered]\n++++\nPhi_\"v\" = ∬_Omega I_\"v\" (vartheta,varphi)\"sin\" vartheta \"d\"varphi \"d\"vartheta\n++++\n\nLuminous intensity can be derived from the spectral radiant intensity distribution by\n\n[stem%unnumbered]\n++++\nI_\"v\" = K_\"m\" int_0^(oo) I_(\"e\",lambda)(lambda)V(lambda)\"d\"lambda\n++++\n\nwhere stem:[K_\"m\"] is maximum luminous efficacy (<>), stem:[I_(\"e\",lambda)(lambda)] is the spectral radiant intensity (<>) at wavelength stem:[lambda] (<>), and stem:[V(lambda)] is spectral luminous efficiency (<>).\n\nThe corresponding radiometric quantity is \"radiant intensity\" (<>). The corresponding quantity for photons is \"photon intensity\" (<>).\n"@en ;
iso:urn .