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Area Lighting / Emission, optical properties of materials

IEV ref845-04-98

Symbol
RL

en
coefficient of retroreflected luminance (of a plane retroreflecting surface)
quotient of the luminance L of the retroreflective surface in the direction of observation by the illuminance E MathType@MTEF@5@5@+=feaagCart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbbjxAHXgaruavP1wzZbItLDhis9wBH5garmWu51MyVXgarqqtubsr4rNCHbGeaGqipG0dh9qqWrVepG0dbbL8F4rqqrVepeea0xe9LqFf0xc9q8qqaqFn0lXdHiVcFbIOFHK8Feea0dXdar=Jb9hs0dXdHuk9fr=xfr=xfrpeWZqaaiqaciWacmGadaGadeaabaGaaqaaaOqaaiaadweadaWgaaWcbaGaeyyPI4fabeaaaaa@37F7@ at the retroreflector on a plane perpendicular to the direction of the incident light

R L =L/ E MathType@MTEF@5@5@+=feaagCart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbbjxAHXgaruavP1wzZbItLDhis9wBH5garmWu51MyVXgarqqtubsr4rNCHbGeaGqipG0dh9qqWrVepG0dbbL8F4rqqrVepeea0xe9LqFf0xc9q8qqaqFn0lXdHiVcFbIOFHK8Feea0dXdar=Jb9hs0dXdHuk9fr=xfr=xfrpeWZqaaiqaciWacmGadaGadeaabaGaaqaaaOqaaiaadkfadaWgaaWcbaGaamitaaqabaGccqGH9aqpdaWcgaqaaiaadYeaaeaacaWGfbWaaSbaaSqaaiabgwQiEbqabaaaaaaa@3BC2@

unit: cd • m -2 • lx -1

NOTE – This quantity is 'particularly suitable for describing materials in sheet form.


fr
coefficient de luminance rétroréfléchie (d'une surface plane rétroréfléchissante) m
quotient de la luminance L de la surface rétroréfléchissante dans la direction d'observation par l'éclairement E MathType@MTEF@5@5@+=feaagCart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbbjxAHXgaruavP1wzZbItLDhis9wBH5garmWu51MyVXgarqqtubsr4rNCHbGeaGqipG0dh9qqWrVepG0dbbL8F4rqqrVepeea0xe9LqFf0xc9q8qqaqFn0lXdHiVcFbIOFHK8Feea0dXdar=Jb9hs0dXdHuk9fr=xfr=xfrpeWZqaaiqaciWaamGadaGadeaabaGaaqaaaOqaaiaadweadaWgaaWcbaGaeyyPI4fabeaaaaa@37F5@ d'un plan passant par ce rétroréflecteur et perpendiculaire à la direction de la lumière incidente

R L =L/ E MathType@MTEF@5@5@+=feaagCart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbbjxAHXgaruavP1wzZbItLDhis9wBH5garmWu51MyVXgarqqtubsr4rNCHbGeaGqipG0dh9qqWrVepG0dbbL8F4rqqrVepeea0xe9LqFf0xc9q8qqaqFn0lXdHiVcFbIOFHK8Feea0dXdar=Jb9hs0dXdHuk9fr=xfr=xfrpeWZqaaiqaciWacmGadaGadeaabaGaaqaaaOqaaiaadkfadaWgaaWcbaGaamitaaqabaGccqGH9aqpdaWcgaqaaiaadYeaaeaacaWGfbWaaSbaaSqaaiabgwQiEbqabaaaaaaa@3BC2@

unité : cd • m -2 • lx -1

NOTE – Cette grandeur est particulièrement utile dans le cas de matériaux en feuilles.


ar
معامل إنارية الانعكاس الخلفي
معامل الإضاءة ذات الإنعكاس المرجعى)

de
Leuchtdichtekoeffizient bei Retroreflexion (eines ebenen Reflexstoffs), m

es
coeficiente de luminancia retrorreflejada

fi
luminanssikerroin
paluuheijastimen luminanssikerroin

it
coefficiente di luminanza retroriflessa

ko
재귀반사 휘도 계수, 평면 재귀성반사 표면

ja
再帰反射輝度係数

no
nb retroluminanskoeffisient

nn retroluminanskoeffisient

pl
współczynnik luminancji powrotnej (płaszczyzny o odbiciu powrotnym)

pt
coeficiente de luminância retro-reflectida (de uma superfície plana retro-reflectida)

sv
retroluminanskoefficiertt

Publication date: 1987
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