{"id":4406,"date":"2026-02-02T06:28:43","date_gmt":"2026-02-02T06:28:43","guid":{"rendered":"https:\/\/pergolalights.net\/?p=4406"},"modified":"2026-04-03T07:40:32","modified_gmt":"2026-04-03T07:40:32","slug":"luminous-flux-intensity-illuminance-luminance","status":"publish","type":"post","link":"https:\/\/pergolalights.net\/fr\/luminous-flux-intensity-illuminance-luminance\/","title":{"rendered":"Flux lumineux | Intensit\u00e9 lumineuse | \u00c9clairement lumineux | Luminance | Angle solide projet\u00e9 Concepts expliqu\u00e9s"},"content":{"rendered":"<div class=\"row align-center\"  id=\"row-309310590\">\n\n\t<div id=\"col-82161757\" class=\"col medium-11 small-12 large-11\"  >\n\t\t\t\t<div class=\"col-inner\"  >\n\t\t\t\n\t\t\t\n\t<div id=\"text-3936084216\" class=\"text\">\n\t\t\n<p>We use the word \u201cbright\u201d every day, but to optical engineers, this phrase could spark a \u201cwar of concepts.\u201d Are you referring to the lamp itself being dazzling, or how clearly it illuminates the tabletop? Behind this lies an entire \u201cmetrology\u201d system precisely describing how light is generated, transmitted, and received. Today, let&#8217;s dissect these core concepts like building blocks: luminous flux, luminous intensity, illuminance, luminance, solid angle, and projected solid angle. Once mastered, you&#8217;ll truly \u201cmaster\u201d light.<\/p>\n\t\t\n<style>\n#text-3936084216 {\n  font-size: 0.75rem;\n  line-height: 1.75;\n}\n@media (min-width:550px) {\n  #text-3936084216 {\n    font-size: 1.1rem;\n    line-height: 2;\n  }\n}\n<\/style>\n\t<\/div>\n\t\n\t<div class=\"img has-hover x md-x lg-x y md-y lg-y\" id=\"image_189061671\">\n\t\t\t\t\t\t\t\t<div class=\"img-inner dark\" >\n\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"1197\" height=\"666\" src=\"https:\/\/pergolalights.net\/wp-content\/uploads\/2026\/02\/Fundamental-Concepts-of-Optics.webp\" class=\"attachment-original size-original\" alt=\"Fundamental Concepts of Optics\" srcset=\"https:\/\/pergolalights.net\/wp-content\/uploads\/2026\/02\/Fundamental-Concepts-of-Optics.webp 1197w, https:\/\/pergolalights.net\/wp-content\/uploads\/2026\/02\/Fundamental-Concepts-of-Optics-719x400.webp 719w, https:\/\/pergolalights.net\/wp-content\/uploads\/2026\/02\/Fundamental-Concepts-of-Optics-768x427.webp 768w, https:\/\/pergolalights.net\/wp-content\/uploads\/2026\/02\/Fundamental-Concepts-of-Optics-18x10.webp 18w, https:\/\/pergolalights.net\/wp-content\/uploads\/2026\/02\/Fundamental-Concepts-of-Optics-510x284.webp 510w\" sizes=\"auto, (max-width: 1197px) 100vw, 1197px\" \/>\t\t\t\t\t\t\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\n<style>\n#image_189061671 {\n  width: 100%;\n}\n<\/style>\n\t<\/div>\n\t\n<div class=\"is-divider divider clearfix\" style=\"max-width:50px;\"><\/div>\n\t<div id=\"gap-950495471\" class=\"gap-element clearfix\" style=\"display:block; height:auto;\">\n\t\t\n<style>\n#gap-950495471 {\n  padding-top: 100px;\n}\n<\/style>\n\t<\/div>\n\t\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\n\t\n<\/div>\n<div class=\"row align-center\"  id=\"row-1264976507\">\n\n\t<div id=\"col-27039054\" class=\"col medium-11 small-12 large-11\"  >\n\t\t\t\t<div class=\"col-inner\"  >\n\t\t\t\n\t\t\t\n<div class=\"row\"  id=\"row-1906173368\">\n\n\t<div id=\"col-1629304968\" class=\"col small-12 large-12\"  >\n\t\t\t\t<div class=\"col-inner text-center\" style=\"background-color:#bc7d4a;\" >\n\t\t\t\n\t\t\t\n<span class=\"scroll-to\" data-label=\"Scroll to: #First\" data-bullet=\"false\" data-link=\"#First\" data-title=\"First\" ><a name=\"First\"><\/a><\/span>\n\t<div id=\"text-928931560\" class=\"text\">\n\t\t\n<h2><strong><b>1. <\/b><\/strong><strong>Le premier \u00e9l\u00e9ment constitutif : Le flux lumineux - le \u201cd\u00e9bit total\u201d de la lumi\u00e8re<\/strong><\/h2>\n\t\t\n<style>\n#text-928931560 {\n  font-size: 0.75rem;\n  color: rgb(255, 255, 255);\n}\n#text-928931560 > * {\n  color: rgb(255, 255, 255);\n}\n@media (min-width:550px) {\n  #text-928931560 {\n    font-size: 1.1rem;\n  }\n}\n<\/style>\n\t<\/div>\n\t\n\t\t<\/div>\n\t\t\t\t\n<style>\n#col-1629304968 > .col-inner {\n  padding: 60px 0px 48px 0px;\n  border-radius: 7px;\n}\n<\/style>\n\t<\/div>\n\n\t\n<\/div>\n\t<div id=\"text-2702587447\" class=\"text\">\n\t\t\n<p>Imagine a water pipe. Luminous flux (\u03a6, measured in lumens lm) is the total volume of water flowing out of the pipe per unit time. It describes the sum of all visible light energy emitted by a light source\u2014a concept of \u201ctotal packaged output.\u201d A 100-watt incandescent bulb produces approximately 1300 lumens\u2014its total \u201clight output.\u201d But total output alone isn&#8217;t enough; light spreads in all directions. This leads us to the second key concept\u2014solid angle.<\/p>\n\t\t\n<style>\n#text-2702587447 {\n  font-size: 0.75rem;\n  line-height: 1.75;\n}\n@media (min-width:550px) {\n  #text-2702587447 {\n    font-size: 1.1rem;\n    line-height: 2;\n  }\n}\n<\/style>\n\t<\/div>\n\t\n\t<div class=\"img has-hover x md-x lg-x y md-y lg-y\" id=\"image_721997139\">\n\t\t\t\t\t\t\t\t<div class=\"img-inner dark\" >\n\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"1197\" height=\"753\" src=\"https:\/\/pergolalights.net\/wp-content\/uploads\/2026\/02\/Luminous-flux-parameter.webp\" class=\"attachment-original size-original\" alt=\"Luminous flux parameter\" srcset=\"https:\/\/pergolalights.net\/wp-content\/uploads\/2026\/02\/Luminous-flux-parameter.webp 1197w, https:\/\/pergolalights.net\/wp-content\/uploads\/2026\/02\/Luminous-flux-parameter-636x400.webp 636w, https:\/\/pergolalights.net\/wp-content\/uploads\/2026\/02\/Luminous-flux-parameter-768x483.webp 768w, https:\/\/pergolalights.net\/wp-content\/uploads\/2026\/02\/Luminous-flux-parameter-18x12.webp 18w, https:\/\/pergolalights.net\/wp-content\/uploads\/2026\/02\/Luminous-flux-parameter-510x321.webp 510w\" sizes=\"auto, (max-width: 1197px) 100vw, 1197px\" \/>\t\t\t\t\t\t\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\n<style>\n#image_721997139 {\n  width: 100%;\n}\n<\/style>\n\t<\/div>\n\t\n<div class=\"is-divider divider clearfix\" style=\"max-width:50px;\"><\/div>\n\t<div id=\"gap-204233169\" class=\"gap-element clearfix\" style=\"display:block; height:auto;\">\n\t\t\n<style>\n#gap-204233169 {\n  padding-top: 100px;\n}\n<\/style>\n\t<\/div>\n\t\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\n\t\n<\/div>\n<div class=\"row align-center\"  id=\"row-1330567716\">\n\n\t<div id=\"col-2041074525\" class=\"col medium-11 small-12 large-11\"  >\n\t\t\t\t<div class=\"col-inner\"  >\n\t\t\t\n\t\t\t\n<div class=\"row\"  id=\"row-454550746\">\n\n\t<div id=\"col-59997874\" class=\"col small-12 large-12\"  >\n\t\t\t\t<div class=\"col-inner text-center\" style=\"background-color:#bc7d4a;\" >\n\t\t\t\n\t\t\t\n<span class=\"scroll-to\" data-label=\"Scroll to: #Two\" data-bullet=\"false\" data-link=\"#Two\" data-title=\"Two\" ><a name=\"Two\"><\/a><\/span>\n\t<div id=\"text-184603827\" class=\"text\">\n\t\t\n<h2><strong><b>2. <\/b><\/strong><strong>Bloc 2 : Angle solide - Une \u201cpart de pizza\u201d dans l'espace<\/strong><\/h2>\n\t\t\n<style>\n#text-184603827 {\n  font-size: 0.75rem;\n  color: rgb(255, 255, 255);\n}\n#text-184603827 > * {\n  color: rgb(255, 255, 255);\n}\n@media (min-width:550px) {\n  #text-184603827 {\n    font-size: 1.1rem;\n  }\n}\n<\/style>\n\t<\/div>\n\t\n\t\t<\/div>\n\t\t\t\t\n<style>\n#col-59997874 > .col-inner {\n  padding: 60px 0px 48px 0px;\n  border-radius: 7px;\n}\n<\/style>\n\t<\/div>\n\n\t\n<\/div>\n\t<div id=\"text-611414722\" class=\"text\">\n\t\t\n<p>Si un angle plan correspond \u00e0 la d\u00e9coupe d'une part de pizza, un angle solide (\u03a9, mesur\u00e9 en st\u00e9radians sr) correspond \u00e0 la d\u00e9coupe d'une \u201cpart de pizza tridimensionnelle\u201d au centre d'une sph\u00e8re. Une sph\u00e8re compl\u00e8te a un angle solide de 4\u03c0 st\u00e9radians. Imaginez que vos yeux soient le centre d'une sph\u00e8re ; toutes les directions que vous pouvez voir forment un \u201cespace visuel\u201d complet. Toute zone partielle de cet espace, comme la port\u00e9e limit\u00e9e par un abat-jour, repr\u00e9sente un angle solide inf\u00e9rieur \u00e0 4\u03c0. Les angles solides mesurent l'ampleur de la divergence de la lumi\u00e8re dans l'espace.<\/p>\n\t\t\n<style>\n#text-611414722 {\n  font-size: 0.75rem;\n  line-height: 1.5;\n}\n@media (min-width:550px) {\n  #text-611414722 {\n    font-size: 1.1rem;\n    line-height: 2;\n  }\n}\n<\/style>\n\t<\/div>\n\t\n\t<div class=\"img has-hover x md-x lg-x y md-y lg-y\" id=\"image_811428545\">\n\t\t\t\t\t\t\t\t<div class=\"img-inner dark\" >\n\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"1197\" height=\"753\" src=\"https:\/\/pergolalights.net\/wp-content\/uploads\/2026\/02\/The-extent-to-which-light-diverges-in-space.webp\" class=\"attachment-original size-original\" alt=\"The extent to which light diverges in space\" srcset=\"https:\/\/pergolalights.net\/wp-content\/uploads\/2026\/02\/The-extent-to-which-light-diverges-in-space.webp 1197w, https:\/\/pergolalights.net\/wp-content\/uploads\/2026\/02\/The-extent-to-which-light-diverges-in-space-636x400.webp 636w, https:\/\/pergolalights.net\/wp-content\/uploads\/2026\/02\/The-extent-to-which-light-diverges-in-space-768x483.webp 768w, https:\/\/pergolalights.net\/wp-content\/uploads\/2026\/02\/The-extent-to-which-light-diverges-in-space-18x12.webp 18w, https:\/\/pergolalights.net\/wp-content\/uploads\/2026\/02\/The-extent-to-which-light-diverges-in-space-510x321.webp 510w\" sizes=\"auto, (max-width: 1197px) 100vw, 1197px\" \/>\t\t\t\t\t\t\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\n<style>\n#image_811428545 {\n  width: 100%;\n}\n<\/style>\n\t<\/div>\n\t\n<div class=\"is-divider divider clearfix\" style=\"max-width:50px;\"><\/div>\n\t<div id=\"gap-275893454\" class=\"gap-element clearfix\" style=\"display:block; height:auto;\">\n\t\t\n<style>\n#gap-275893454 {\n  padding-top: 100px;\n}\n<\/style>\n\t<\/div>\n\t\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\n\t\n<\/div>\n<div class=\"row align-center\"  id=\"row-1061932450\">\n\n\t<div id=\"col-1341265637\" class=\"col medium-11 small-12 large-11\"  >\n\t\t\t\t<div class=\"col-inner\"  >\n\t\t\t\n\t\t\t\n<div class=\"row\"  id=\"row-1787759478\">\n\n\t<div id=\"col-268658560\" class=\"col small-12 large-12\"  >\n\t\t\t\t<div class=\"col-inner text-center\" style=\"background-color:#bc7d4a;\" >\n\t\t\t\n\t\t\t\n<span class=\"scroll-to\" data-label=\"Scroll to: #Building\" data-bullet=\"false\" data-link=\"#Building\" data-title=\"Building\" ><a name=\"Building\"><\/a><\/span>\n\t<div id=\"text-1707989340\" class=\"text\">\n\t\t\n<h2><strong><b>3. <\/b><\/strong><strong>Premier \u00e9l\u00e9ment : l'intensit\u00e9 lumineuse - la \u201cconcentration\u201d de la lumi\u00e8re<\/strong><\/h2>\n\t\t\n<style>\n#text-1707989340 {\n  font-size: 0.75rem;\n  color: rgb(255, 255, 255);\n}\n#text-1707989340 > * {\n  color: rgb(255, 255, 255);\n}\n@media (min-width:550px) {\n  #text-1707989340 {\n    font-size: 1.1rem;\n  }\n}\n<\/style>\n\t<\/div>\n\t\n\t\t<\/div>\n\t\t\t\t\n<style>\n#col-268658560 > .col-inner {\n  padding: 60px 0px 48px 0px;\n  border-radius: 7px;\n}\n<\/style>\n\t<\/div>\n\n\t\n<\/div>\n\t<div id=\"text-671447890\" class=\"text\">\n\t\t\n<p>Nous combinons maintenant les concepts de flux lumineux et d'angle solide. Si le flux lumineux est comprim\u00e9 et \u00e9mis dans un angle solide sp\u00e9cifique, sa \u201cdensit\u00e9\u201d augmente. L'intensit\u00e9 lumineuse (I, unit\u00e9 : candela cd) est pr\u00e9cis\u00e9ment la grandeur physique d\u00e9crivant ce degr\u00e9 de concentration : I = \u03a6 \/ \u03a9, c'est-\u00e0-dire le flux lumineux \u00e9mis par une source lumineuse \u00e0 l'int\u00e9rieur d'un angle solide unitaire dans une direction sp\u00e9cifique.<\/p>\n\t\t\n<style>\n#text-671447890 {\n  font-size: 0.75rem;\n  line-height: 1.5;\n}\n@media (min-width:550px) {\n  #text-671447890 {\n    font-size: 1.1rem;\n    line-height: 2;\n  }\n}\n<\/style>\n\t<\/div>\n\t\n\t<div id=\"gap-1835279901\" class=\"gap-element clearfix\" style=\"display:block; height:auto;\">\n\t\t\n<style>\n#gap-1835279901 {\n  padding-top: 30px;\n}\n<\/style>\n\t<\/div>\n\t\n\t<div id=\"text-3424390054\" class=\"text\">\n\t\t\n<p>Un pointeur laser, malgr\u00e9 son faible flux lumineux total (\u03a6), \u00e9met toute la lumi\u00e8re dans un angle solide extr\u00eamement petit (\u03a9). Il en r\u00e9sulte une intensit\u00e9 lumineuse (I) extr\u00eamement \u00e9lev\u00e9e dans cette direction, ce qui la rend tr\u00e8s \u00e9blouissante. Une bougie, en revanche, \u00e9met un flux lumineux important dans toutes les directions. Cependant, en raison de son grand angle solide, son intensit\u00e9 lumineuse n'est pas \u00e9lev\u00e9e.<\/p>\n\t\t\n<style>\n#text-3424390054 {\n  font-size: 0.75rem;\n  line-height: 1.5;\n}\n@media (min-width:550px) {\n  #text-3424390054 {\n    font-size: 1.1rem;\n    line-height: 2;\n  }\n}\n<\/style>\n\t<\/div>\n\t\n\t<div class=\"img has-hover x md-x lg-x y md-y lg-y\" id=\"image_253658773\">\n\t\t\t\t\t\t\t\t<div class=\"img-inner dark\" >\n\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"1197\" height=\"666\" src=\"https:\/\/pergolalights.net\/wp-content\/uploads\/2026\/02\/Explanation-of-luminous-intensity.webp\" class=\"attachment-original size-original\" alt=\"Explanation of luminous intensity\" srcset=\"https:\/\/pergolalights.net\/wp-content\/uploads\/2026\/02\/Explanation-of-luminous-intensity.webp 1197w, https:\/\/pergolalights.net\/wp-content\/uploads\/2026\/02\/Explanation-of-luminous-intensity-719x400.webp 719w, https:\/\/pergolalights.net\/wp-content\/uploads\/2026\/02\/Explanation-of-luminous-intensity-768x427.webp 768w, https:\/\/pergolalights.net\/wp-content\/uploads\/2026\/02\/Explanation-of-luminous-intensity-18x10.webp 18w, https:\/\/pergolalights.net\/wp-content\/uploads\/2026\/02\/Explanation-of-luminous-intensity-510x284.webp 510w\" sizes=\"auto, (max-width: 1197px) 100vw, 1197px\" \/>\t\t\t\t\t\t\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\n<style>\n#image_253658773 {\n  width: 100%;\n}\n<\/style>\n\t<\/div>\n\t\n<div class=\"is-divider divider clearfix\" style=\"max-width:50px;\"><\/div>\n\t<div id=\"gap-815280184\" class=\"gap-element clearfix\" style=\"display:block; height:auto;\">\n\t\t\n<style>\n#gap-815280184 {\n  padding-top: 100px;\n}\n<\/style>\n\t<\/div>\n\t\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\n\t\n<\/div>\n<div class=\"row align-center\"  id=\"row-372591818\">\n\n\t<div id=\"col-1096146058\" class=\"col medium-11 small-12 large-11\"  >\n\t\t\t\t<div class=\"col-inner\"  >\n\t\t\t\n\t\t\t\n<div class=\"row\"  id=\"row-81746364\">\n\n\t<div id=\"col-862696808\" class=\"col small-12 large-12\"  >\n\t\t\t\t<div class=\"col-inner text-center\" style=\"background-color:#bc7d4a;\" >\n\t\t\t\n\t\t\t\n<span class=\"scroll-to\" data-label=\"Scroll to: #Illuminance\" data-bullet=\"false\" data-link=\"#Illuminance\" data-title=\"Illuminance\" ><a name=\"Illuminance\"><\/a><\/span>\n\t<div id=\"text-4191099090\" class=\"text\">\n\t\t\n<h2><strong><b>4. <\/b><\/strong><strong>La troisi\u00e8me pierre \u00e0 l'\u00e9difice : Illuminance - Le \u201cbonheur\u201d illumin\u00e9\u201d<\/strong><\/h2>\n\t\t\n<style>\n#text-4191099090 {\n  font-size: 0.75rem;\n  color: rgb(255, 255, 255);\n}\n#text-4191099090 > * {\n  color: rgb(255, 255, 255);\n}\n@media (min-width:550px) {\n  #text-4191099090 {\n    font-size: 1.1rem;\n  }\n}\n<\/style>\n\t<\/div>\n\t\n\t\t<\/div>\n\t\t\t\t\n<style>\n#col-862696808 > .col-inner {\n  padding: 60px 0px 48px 0px;\n  border-radius: 7px;\n}\n<\/style>\n\t<\/div>\n\n\t\n<\/div>\n\t<div id=\"text-559593406\" class=\"text\">\n\t\t\n<p>L'\u00e9clairement (E, mesur\u00e9 en lux lx) d\u00e9crit la quantit\u00e9 de flux lumineux re\u00e7u par unit\u00e9 de surface \u00e9clair\u00e9e : E = \u03a6 \/ A. Il r\u00e9pond \u00e0 la question \u201cQuelle est la luminosit\u00e9 de cette table ?\u201d en fonction de la source lumineuse et de la distance. C'est pourquoi la lecture sous un lampadaire est plus claire qu'au clair de lune : bien que la lune (qui refl\u00e8te la lumi\u00e8re du soleil) ait un flux lumineux total \u00e9norme, sa distance est si grande que la \u201cdensit\u00e9 de flux lumineux\u201d (c'est-\u00e0-dire l'\u00e9clairement) qui atteint la page du livre est n\u00e9gligeable.<\/p>\n\t\t\n<style>\n#text-559593406 {\n  font-size: 0.75rem;\n  line-height: 1.5;\n}\n@media (min-width:550px) {\n  #text-559593406 {\n    font-size: 1.1rem;\n    line-height: 2;\n  }\n}\n<\/style>\n\t<\/div>\n\t\n\t<div class=\"img has-hover x md-x lg-x y md-y lg-y\" id=\"image_1463282745\">\n\t\t\t\t\t\t\t\t<div class=\"img-inner dark\" >\n\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"1197\" height=\"750\" src=\"https:\/\/pergolalights.net\/wp-content\/uploads\/2026\/02\/Apparent-illuminance.webp\" class=\"attachment-original size-original\" alt=\"Apparent illuminance\" srcset=\"https:\/\/pergolalights.net\/wp-content\/uploads\/2026\/02\/Apparent-illuminance.webp 1197w, https:\/\/pergolalights.net\/wp-content\/uploads\/2026\/02\/Apparent-illuminance-638x400.webp 638w, https:\/\/pergolalights.net\/wp-content\/uploads\/2026\/02\/Apparent-illuminance-768x481.webp 768w, https:\/\/pergolalights.net\/wp-content\/uploads\/2026\/02\/Apparent-illuminance-18x12.webp 18w, https:\/\/pergolalights.net\/wp-content\/uploads\/2026\/02\/Apparent-illuminance-510x320.webp 510w\" sizes=\"auto, (max-width: 1197px) 100vw, 1197px\" \/>\t\t\t\t\t\t\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\n<style>\n#image_1463282745 {\n  width: 100%;\n}\n<\/style>\n\t<\/div>\n\t\n<div class=\"is-divider divider clearfix\" style=\"max-width:50px;\"><\/div>\n\t<div id=\"gap-310268615\" class=\"gap-element clearfix\" style=\"display:block; height:auto;\">\n\t\t\n<style>\n#gap-310268615 {\n  padding-top: 100px;\n}\n<\/style>\n\t<\/div>\n\t\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\n\t\n<\/div>\n<div class=\"row align-center\"  id=\"row-1292373470\">\n\n\t<div id=\"col-1101167773\" class=\"col medium-11 small-12 large-11\"  >\n\t\t\t\t<div class=\"col-inner\"  >\n\t\t\t\n\t\t\t\n<div class=\"row\"  id=\"row-1741414276\">\n\n\t<div id=\"col-2093133709\" class=\"col small-12 large-12\"  >\n\t\t\t\t<div class=\"col-inner text-center\" style=\"background-color:#bc7d4a;\" >\n\t\t\t\n\t\t\t\n<span class=\"scroll-to\" data-label=\"Scroll to: #Ultimate\" data-bullet=\"false\" data-link=\"#Ultimate\" data-title=\"Ultimate\" ><a name=\"Ultimate\"><\/a><\/span>\n\t<div id=\"text-1990468594\" class=\"text\">\n\t\t\n<h2><strong><b>5. <\/b><\/strong><strong>L'\u00e9l\u00e9ment constitutif ultime : Luminance - La \u201cluminosit\u00e9\u201d de la source lumineuse elle-m\u00eame<\/strong><\/h2>\n\t\t\n<style>\n#text-1990468594 {\n  font-size: 0.75rem;\n  color: rgb(255, 255, 255);\n}\n#text-1990468594 > * {\n  color: rgb(255, 255, 255);\n}\n@media (min-width:550px) {\n  #text-1990468594 {\n    font-size: 1.1rem;\n  }\n}\n<\/style>\n\t<\/div>\n\t\n\t\t<\/div>\n\t\t\t\t\n<style>\n#col-2093133709 > .col-inner {\n  padding: 60px 0px 48px 0px;\n  border-radius: 7px;\n}\n<\/style>\n\t<\/div>\n\n\t\n<\/div>\n\t<div id=\"text-3376415253\" class=\"text\">\n\t\t\n<p>C'est le concept le plus facilement confus, mais c'est pourtant le v\u00e9ritable param\u00e8tre \u201croi\u201d.<\/p>\n<p>La luminance (L, mesur\u00e9e en nits ou cd\/m\u00b2) repr\u00e9sente la luminosit\u00e9 per\u00e7ue d'une source lumineuse dans une direction sp\u00e9cifique, telle qu'elle est per\u00e7ue par l'\u0153il humain (ou un d\u00e9tecteur). Sa d\u00e9finition synth\u00e9tise tous les concepts pr\u00e9c\u00e9dents : L = I \/ (A - cos\u03b8). Ici, I est l'intensit\u00e9 lumineuse dans cette direction, A est la surface d'\u00e9mission lumineuse de la source, et \u03b8 est l'angle entre la direction d'observation et la normale.<\/p>\n<p>Luminance describes the luminous flux per unit area of the light source surface within a unit solid angle. It is an intrinsic property independent of distance. For example, a streetlight has far greater luminous intensity (I) and total luminous flux (\u03a6) than a smartphone screen, but its surface area (A) is larger, and its light diverges in all directions (large solid angle \u03a9). In contrast, a smartphone screen concentrates its luminous flux over a small area and within a narrow solid angle. Calculations show that the screen&#8217;s luminance (L \u2248 I\/A) can easily exceed 1000 nits\u2014far surpassing the luminance of an old streetlight&#8217;s surface. This is why staring directly at a smartphone screen feels more glaring.<\/p>\n\t\t\n<style>\n#text-3376415253 {\n  font-size: 0.75rem;\n  line-height: 1.5;\n}\n@media (min-width:550px) {\n  #text-3376415253 {\n    font-size: 1.1rem;\n    line-height: 2;\n  }\n}\n<\/style>\n\t<\/div>\n\t\n\t<div class=\"img has-hover x md-x lg-x y md-y lg-y\" id=\"image_537349990\">\n\t\t\t\t\t\t\t\t<div class=\"img-inner dark\" >\n\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"1197\" height=\"753\" src=\"https:\/\/pergolalights.net\/wp-content\/uploads\/2026\/02\/Luminous-flux-within-the-unit-solid-angle.webp\" class=\"attachment-original size-original\" alt=\"Luminous flux within the unit solid angle\" srcset=\"https:\/\/pergolalights.net\/wp-content\/uploads\/2026\/02\/Luminous-flux-within-the-unit-solid-angle.webp 1197w, https:\/\/pergolalights.net\/wp-content\/uploads\/2026\/02\/Luminous-flux-within-the-unit-solid-angle-636x400.webp 636w, https:\/\/pergolalights.net\/wp-content\/uploads\/2026\/02\/Luminous-flux-within-the-unit-solid-angle-768x483.webp 768w, https:\/\/pergolalights.net\/wp-content\/uploads\/2026\/02\/Luminous-flux-within-the-unit-solid-angle-18x12.webp 18w, https:\/\/pergolalights.net\/wp-content\/uploads\/2026\/02\/Luminous-flux-within-the-unit-solid-angle-510x321.webp 510w\" sizes=\"auto, (max-width: 1197px) 100vw, 1197px\" \/>\t\t\t\t\t\t\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\n<style>\n#image_537349990 {\n  width: 100%;\n}\n<\/style>\n\t<\/div>\n\t\n<div class=\"is-divider divider clearfix\" style=\"max-width:50px;\"><\/div>\n\t<div id=\"gap-334612818\" class=\"gap-element clearfix\" style=\"display:block; height:auto;\">\n\t\t\n<style>\n#gap-334612818 {\n  padding-top: 100px;\n}\n<\/style>\n\t<\/div>\n\t\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\n\t\n<\/div>\n<div class=\"row align-center\"  id=\"row-1858535665\">\n\n\t<div id=\"col-1806965845\" class=\"col medium-11 small-12 large-11\"  >\n\t\t\t\t<div class=\"col-inner\"  >\n\t\t\t\n\t\t\t\n<div class=\"row\"  id=\"row-120232030\">\n\n\t<div id=\"col-1918254642\" class=\"col small-12 large-12\"  >\n\t\t\t\t<div class=\"col-inner text-center\" style=\"background-color:#bc7d4a;\" >\n\t\t\t\n\t\t\t\n<span class=\"scroll-to\" data-label=\"Scroll to: #Secret\" data-bullet=\"false\" data-link=\"#Secret\" data-title=\"Secret\" ><a name=\"Secret\"><\/a><\/span>\n\t<div id=\"text-3248424474\" class=\"text\">\n\t\t\n<h2><strong><b>6. <\/b><\/strong><strong>Cl\u00e9 secr\u00e8te : Angle solide projet\u00e9<\/strong><\/h2>\n\t\t\n<style>\n#text-3248424474 {\n  font-size: 0.75rem;\n  color: rgb(255, 255, 255);\n}\n#text-3248424474 > * {\n  color: rgb(255, 255, 255);\n}\n@media (min-width:550px) {\n  #text-3248424474 {\n    font-size: 1.1rem;\n  }\n}\n<\/style>\n\t<\/div>\n\t\n\t\t<\/div>\n\t\t\t\t\n<style>\n#col-1918254642 > .col-inner {\n  padding: 60px 0px 48px 0px;\n  border-radius: 7px;\n}\n<\/style>\n\t<\/div>\n\n\t\n<\/div>\n\t<div id=\"text-996596420\" class=\"text\">\n\t\t\n<p>Dans la d\u00e9finition de la luminance, le terme de surface est A - cos\u03b8, repr\u00e9sentant la surface projet\u00e9e. Pourquoi projeter ? Parce que lorsque la direction d'observation est inclin\u00e9e, la surface lumineuse effective que vous percevez se r\u00e9duit. Cela introduit naturellement le concept d'angle solide projet\u00e9.<\/p>\n<p>Lors du calcul de l'\u00e9clairement sur une surface \u00e9clair\u00e9e, l'angle solide entre la source lumineuse et la surface doit \u00e9galement tenir compte de ce facteur d'inclinaison, l'angle solide projet\u00e9. Il comble le foss\u00e9 entre la luminance de la source lumineuse et l'\u00e9clairement de la surface, servant d'outil de base pour des calculs plus pr\u00e9cis dans le tra\u00e7age des rayons et la radiom\u00e9trie.<\/p>\n\t\t\n<style>\n#text-996596420 {\n  font-size: 0.75rem;\n  line-height: 1.5;\n}\n@media (min-width:550px) {\n  #text-996596420 {\n    font-size: 1.1rem;\n    line-height: 2;\n  }\n}\n<\/style>\n\t<\/div>\n\t\n<div class=\"is-divider divider clearfix\" style=\"max-width:50px;\"><\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\n\t\n<\/div>","protected":false},"excerpt":{"rendered":"","protected":false},"author":1,"featured_media":4416,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"footnotes":""},"categories":[84],"tags":[],"class_list":["post-4406","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-technical"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.1.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"Confused by &quot;brightness&quot;? 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