{"id":3237,"date":"2025-09-03T06:35:07","date_gmt":"2025-09-03T06:35:07","guid":{"rendered":"https:\/\/pergolalights.net\/?p=3237"},"modified":"2026-04-03T08:23:07","modified_gmt":"2026-04-03T08:23:07","slug":"what-are-lumens-lux-nits-and-candela","status":"publish","type":"post","link":"https:\/\/pergolalights.net\/fr\/what-are-lumens-lux-nits-and-candela\/","title":{"rendered":"Que sont les lumens, les lux, les nits et les candelas ?"},"content":{"rendered":"<div class=\"row align-center\"  id=\"row-1427971408\">\n\n\t<div id=\"col-298620904\" 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-671374681\">\n\n\t<div id=\"col-155756363\" 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\t<div id=\"text-4122328057\" class=\"text\">\n\t\t\n<h2><strong><b>1. <\/b><\/strong><strong>Avant-propos<\/strong><\/h2>\n\t\t\n<style>\n#text-4122328057 {\n  font-size: 0.75rem;\n  color: rgb(255, 255, 255);\n}\n#text-4122328057 > * {\n  color: rgb(255, 255, 255);\n}\n@media (min-width:550px) {\n  #text-4122328057 {\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-155756363 > .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-492283536\" class=\"text\">\n\t\t\n<p>Dans notre vie quotidienne, la lumi\u00e8re est omnipr\u00e9sente : des lampes de nos maisons aux \u00e9crans de nos t\u00e9l\u00e9phones portables, de la lumi\u00e8re du soleil \u00e0 l'ext\u00e9rieur aux n\u00e9ons de la nuit. Elle nous entoure sous de multiples formes. Pour d\u00e9crire les propri\u00e9t\u00e9s de la lumi\u00e8re, certaines unit\u00e9s physiques sp\u00e9cialis\u00e9es sont indispensables : lumens, lux, nits et candelas sont quatre des plus importantes. Bien qu'apparemment abstraites, ces unit\u00e9s sont intrins\u00e8quement li\u00e9es \u00e0 notre perception de la lumi\u00e8re et \u00e0 ses applications pratiques. De la s\u00e9lection d'ampoules de luminosit\u00e9 appropri\u00e9e \u00e0 la conception d'effets d'affichage pour les \u00e9crans, et m\u00eame dans des domaines sp\u00e9cialis\u00e9s tels que la photographie et l'ing\u00e9nierie de l'\u00e9clairage, ces unit\u00e9s jouent un r\u00f4le indispensable.<\/p>\n<p>Cependant, ces quatre concepts sont souvent source de confusion pour de nombreuses personnes, qui peinent \u00e0 distinguer clairement leurs significations et applications respectives. Il est donc essentiel de clarifier les concepts de ces quatre unit\u00e9s et de d\u00e9finir les propri\u00e9t\u00e9s optiques qu'elles d\u00e9crivent pour mieux comprendre et utiliser la lumi\u00e8re.<\/p>\n\t\t\n<style>\n#text-492283536 {\n  font-size: 0.75rem;\n  line-height: 1.5;\n}\n@media (min-width:550px) {\n  #text-492283536 {\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_2026131857\">\n\t\t\t\t\t\t\t\t<div class=\"img-inner dark\" style=\"margin:0px 0px 20px 0px;\">\n\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"2000\" height=\"1208\" src=\"https:\/\/pergolalights.net\/wp-content\/uploads\/2025\/09\/Lumen_lux_nit_candela.webp\" class=\"attachment-original size-original\" alt=\"Lumen,_lux,_nit,_candela\" srcset=\"https:\/\/pergolalights.net\/wp-content\/uploads\/2025\/09\/Lumen_lux_nit_candela.webp 2000w, https:\/\/pergolalights.net\/wp-content\/uploads\/2025\/09\/Lumen_lux_nit_candela-510x308.webp 510w, https:\/\/pergolalights.net\/wp-content\/uploads\/2025\/09\/Lumen_lux_nit_candela-662x400.webp 662w, https:\/\/pergolalights.net\/wp-content\/uploads\/2025\/09\/Lumen_lux_nit_candela-1325x800.webp 1325w, https:\/\/pergolalights.net\/wp-content\/uploads\/2025\/09\/Lumen_lux_nit_candela-768x464.webp 768w, https:\/\/pergolalights.net\/wp-content\/uploads\/2025\/09\/Lumen_lux_nit_candela-1536x928.webp 1536w, https:\/\/pergolalights.net\/wp-content\/uploads\/2025\/09\/Lumen_lux_nit_candela-18x12.webp 18w\" sizes=\"auto, (max-width: 2000px) 100vw, 2000px\" \/>\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_2026131857 {\n  width: 100%;\n}\n<\/style>\n\t<\/div>\n\t\n\t<div id=\"gap-1909609318\" class=\"gap-element clearfix\" style=\"display:block; height:auto;\">\n\t\t\n<style>\n#gap-1909609318 {\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-53932135\">\n\n\t<div id=\"col-1513957008\" class=\"col medium-11 small-12 large-11\"  >\n\t\t\t\t<div class=\"col-inner text-center\" style=\"background-color:#bc7d4a;\" >\n\t\t\t\n\t\t\t\n\t<div id=\"text-250246377\" class=\"text\">\n\t\t\n<h2><strong><b>2. <\/b><\/strong><strong>Concept succinct<\/strong><\/h2>\n\t\t\n<style>\n#text-250246377 {\n  font-size: 0.75rem;\n  line-height: 1.5;\n  color: rgb(255,255,255);\n}\n#text-250246377 > * {\n  color: rgb(255,255,255);\n}\n@media (min-width:550px) {\n  #text-250246377 {\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-1513957008 > .col-inner {\n  padding: 60px 0px 48px 0px;\n  border-radius: 7px;\n}\n<\/style>\n\t<\/div>\n\n\t\n<\/div>\n<div class=\"row align-center\"  id=\"row-674403518\">\n\n\t<div id=\"col-339521242\" 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-4116729762\" class=\"text\">\n\t\t\n<p>1. Le lumen est une unit\u00e9 de mesure de la lumi\u00e8re, similaire au watt, mais dont la mesure tient compte de la sensibilit\u00e9 de l'\u0153il humain. Lorsqu'on examine les sp\u00e9cifications d'une source lumineuse, les lumens mesurent la puissance totale de la source lumineuse, quelle que soit la direction dans laquelle la lumi\u00e8re est \u00e9mise.<\/p>\n<p>2. Le lux d\u00e9signe le nombre de lumens re\u00e7us par m\u00e8tre carr\u00e9. Dans le langage courant, nous pourrions l'appeler \u2018\u00e9clairement\u2019, bien qu'au sein de la profession optique, il soit appel\u00e9 \u2018\u00e9clairement\u2019. Il indique la quantit\u00e9 de lumi\u00e8re tombant sur une surface donn\u00e9e.<\/p>\n<p>3. Le nit est le nombre de lumens par m\u00e8tre carr\u00e9 et par st\u00e9radian, que l'on pourrait appeler \u2018luminosit\u00e9\u2019 dans le langage courant, bien qu'il soit appel\u00e9 \u2018luminance\u2019 dans l'industrie. Si un \u00e9clairement de 1 lux tombe sur une surface diffuse-r\u00e9fl\u00e9chissante id\u00e9ale, il produit une luminance de 1 nit.<\/p>\n<p>4. La candela est le nombre de lumens par st\u00e9radian. Elle est utilis\u00e9e pour les sources lumineuses ponctuelles et permet de calculer la quantit\u00e9 de lumi\u00e8re re\u00e7ue par toute surface \u00e9clair\u00e9e, quel que soit son emplacement.<\/p>\n\t\t\n<style>\n#text-4116729762 {\n  font-size: 0.75rem;\n  line-height: 1.5;\n}\n@media (min-width:550px) {\n  #text-4116729762 {\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_1767872155\">\n\t\t\t\t\t\t\t\t<div class=\"img-inner dark\" style=\"margin:0px 0px 20px 0px;\">\n\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"2560\" height=\"1186\" src=\"https:\/\/pergolalights.net\/wp-content\/uploads\/2025\/09\/LUMENS__CANDELAS-scaled.webp\" class=\"attachment-original size-original\" alt=\"LUMENS_&amp;_CANDELAS\" srcset=\"https:\/\/pergolalights.net\/wp-content\/uploads\/2025\/09\/LUMENS__CANDELAS-scaled.webp 2560w, https:\/\/pergolalights.net\/wp-content\/uploads\/2025\/09\/LUMENS__CANDELAS-scaled-510x236.webp 510w, https:\/\/pergolalights.net\/wp-content\/uploads\/2025\/09\/LUMENS__CANDELAS-800x371.webp 800w, https:\/\/pergolalights.net\/wp-content\/uploads\/2025\/09\/LUMENS__CANDELAS-1400x648.webp 1400w, https:\/\/pergolalights.net\/wp-content\/uploads\/2025\/09\/LUMENS__CANDELAS-768x356.webp 768w, https:\/\/pergolalights.net\/wp-content\/uploads\/2025\/09\/LUMENS__CANDELAS-1536x711.webp 1536w, https:\/\/pergolalights.net\/wp-content\/uploads\/2025\/09\/LUMENS__CANDELAS-2048x948.webp 2048w, https:\/\/pergolalights.net\/wp-content\/uploads\/2025\/09\/LUMENS__CANDELAS-18x8.webp 18w\" sizes=\"auto, (max-width: 2560px) 100vw, 2560px\" \/>\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_1767872155 {\n  width: 100%;\n}\n<\/style>\n\t<\/div>\n\t\n\t<div id=\"text-2667600039\" class=\"text\">\n\t\t\n<p>En d'autres termes, la candela mesure l'intensit\u00e9 lumineuse \u00e0 travers une sph\u00e8re imaginaire centr\u00e9e sur la source lumineuse. Pour une source ponctuelle isotrope, une candela \u00e9quivaut \u00e0 un lumen par st\u00e9radian. Une sph\u00e8re compl\u00e8te entourant la source lumineuse comprend 4\u03c0 (environ 12,6) st\u00e9radians. Par cons\u00e9quent, une source lumineuse isotrope \u00e9mettant 12,6 lumens produit une intensit\u00e9 lumineuse de 1 candela. Cela ne s'applique pas enti\u00e8rement aux lasers typiques, mais pour les sources lumineuses telles que les lampes au x\u00e9non \u00e0 arc court, il s'agit d'une approximation raisonnable. N\u00e9anmoins, la candela peut toujours \u00eatre d\u00e9finie pour une partie d'un faisceau divergent. Par exemple, si votre laser \u00e9met 1 lumen dans un rayon de seulement 0,1 st\u00e9radian, son intensit\u00e9 lumineuse sera de 10 candelas.<\/p>\n\t\t\n<style>\n#text-2667600039 {\n  font-size: 0.75rem;\n  line-height: 1.5;\n}\n@media (min-width:550px) {\n  #text-2667600039 {\n    font-size: 1.1rem;\n    line-height: 2;\n  }\n}\n<\/style>\n\t<\/div>\n\t\n\t<div id=\"text-3739466473\" class=\"text\">\n\t\t\n<p>Le pied-candle est une unit\u00e9 d'\u00e9clairement. L'Illuminating Engineering Society of North America le d\u00e9finit dans la norme ANSI\/IES RP-16-1996, Terminology of Lighting Engineering, comme \u2018la densit\u00e9 surfacique du flux lumineux incident sur un point d'une surface\u2019.<\/p>\n\t\t\n<style>\n#text-3739466473 {\n  font-size: 0.75rem;\n  line-height: 1.5;\n}\n@media (min-width:550px) {\n  #text-3739466473 {\n    font-size: 1.1rem;\n    line-height: 2;\n  }\n}\n<\/style>\n\t<\/div>\n\t\n\t<div id=\"text-1779615810\" class=\"text\">\n\t\t\n<p>In layman&#8217;s terms, illuminance is the amount of light reaching a point on a real or imaginary surface. (This point need not be located on a physical surface.)<\/p>\n\t\t\n<style>\n#text-1779615810 {\n  font-size: 0.75rem;\n  line-height: 1.5;\n}\n@media (min-width:550px) {\n  #text-1779615810 {\n    font-size: 1.1rem;\n    line-height: 2;\n  }\n}\n<\/style>\n\t<\/div>\n\t\n\t<div id=\"text-1445397081\" class=\"text\">\n\t\t\n<p>Un pied-bougie \u00e9quivaut \u00e0 un lumen par pied carr\u00e9 (le lumen \u00e9tant l'unit\u00e9 de mesure du flux lumineux ou de la quantit\u00e9 de lumi\u00e8re).<\/p>\n\t\t\n<style>\n#text-1445397081 {\n  font-size: 0.75rem;\n  line-height: 1.5;\n}\n@media (min-width:550px) {\n  #text-1445397081 {\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_1499699052\">\n\t\t\t\t\t\t\t\t<div class=\"img-inner dark\" style=\"margin:0px 0px 20px 0px;\">\n\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"2000\" height=\"1120\" src=\"https:\/\/pergolalights.net\/wp-content\/uploads\/2025\/09\/conforming_to_the_inverse_square_law_for_point_light_sources.webp\" class=\"attachment-original size-original\" alt=\"conforming_to_the_inverse_square_law_for_point_light_sources\" srcset=\"https:\/\/pergolalights.net\/wp-content\/uploads\/2025\/09\/conforming_to_the_inverse_square_law_for_point_light_sources.webp 2000w, https:\/\/pergolalights.net\/wp-content\/uploads\/2025\/09\/conforming_to_the_inverse_square_law_for_point_light_sources-510x286.webp 510w, https:\/\/pergolalights.net\/wp-content\/uploads\/2025\/09\/conforming_to_the_inverse_square_law_for_point_light_sources-714x400.webp 714w, https:\/\/pergolalights.net\/wp-content\/uploads\/2025\/09\/conforming_to_the_inverse_square_law_for_point_light_sources-1400x784.webp 1400w, https:\/\/pergolalights.net\/wp-content\/uploads\/2025\/09\/conforming_to_the_inverse_square_law_for_point_light_sources-768x430.webp 768w, https:\/\/pergolalights.net\/wp-content\/uploads\/2025\/09\/conforming_to_the_inverse_square_law_for_point_light_sources-1536x860.webp 1536w, https:\/\/pergolalights.net\/wp-content\/uploads\/2025\/09\/conforming_to_the_inverse_square_law_for_point_light_sources-18x10.webp 18w\" sizes=\"auto, (max-width: 2000px) 100vw, 2000px\" \/>\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_1499699052 {\n  width: 100%;\n}\n<\/style>\n\t<\/div>\n\t\n\t<div id=\"text-956573727\" class=\"text\">\n\t\t\n<p>The luminous intensity of a candle flame (or equivalently, its candela) is approximately 1 candela. If you place the candle one foot away from a surface, the illuminance on that surface at this distance will be approximately one\u00a0foot-candle due to the candle&#8217;s illumination. At 2 feet, the illuminance would be 1\/4 foot-candle; at 3 feet, it would be 1\/9 foot-candle, and so on, conforming to the inverse square law for point light sources.<\/p>\n\t\t\n<style>\n#text-956573727 {\n  font-size: 0.75rem;\n  line-height: 1.5;\n}\n@media (min-width:550px) {\n  #text-956573727 {\n    font-size: 1.1rem;\n    line-height: 2;\n  }\n}\n<\/style>\n\t<\/div>\n\t\n\t<div id=\"text-3330910565\" class=\"text\">\n\t\t\n<p>La luminosit\u00e9 est un ph\u00e9nom\u00e8ne psychophysique qui ne peut \u00eatre mesur\u00e9 directement. Le terme \u201cluminosit\u00e9 photom\u00e9trique\u201d \u00e9tait autrefois utilis\u00e9 pour d\u00e9signer la luminance, mais il n'est plus employ\u00e9 dans les contextes scientifiques ou techniques.<\/p>\n\t\t\n<style>\n#text-3330910565 {\n  font-size: 0.75rem;\n  line-height: 1.5;\n}\n@media (min-width:550px) {\n  #text-3330910565 {\n    font-size: 1.1rem;\n    line-height: 2;\n  }\n}\n<\/style>\n\t<\/div>\n\t\n\t<div id=\"gap-1966129418\" class=\"gap-element clearfix\" style=\"display:block; height:auto;\">\n\t\t\n<style>\n#gap-1966129418 {\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-1859252370\">\n\n\t<div id=\"col-1638463915\" class=\"col medium-11 small-12 large-11\"  >\n\t\t\t\t<div class=\"col-inner text-center\" style=\"background-color:#bc7d4a;\" >\n\t\t\t\n\t\t\t\n\t<div id=\"text-26894797\" class=\"text\">\n\t\t\n<h2><strong><b>3. <\/b><\/strong><strong>D\u00e9finition sp\u00e9cifique<\/strong><\/h2>\n\t\t\n<style>\n#text-26894797 {\n  font-size: 0.75rem;\n  line-height: 1.5;\n  color: rgb(255,255,255);\n}\n#text-26894797 > * {\n  color: rgb(255,255,255);\n}\n@media (min-width:550px) {\n  #text-26894797 {\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-1638463915 > .col-inner {\n  padding: 60px 0px 48px 0px;\n  border-radius: 7px;\n}\n<\/style>\n\t<\/div>\n\n\t\n\n\t<div id=\"col-1274428473\" 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-99823368\" class=\"text\">\n\t\t\n<p><strong><b>D\u00e9finition du lumen<\/b><\/strong>: Flux lumineux d'une lumi\u00e8re monochromatique \u00e0 une fr\u00e9quence de 540 t\u00e9rahertz (ou une longueur d'onde d'environ 555,5 nanom\u00e8tres) d'une puissance de 1\/683 watts. Il convient de noter que le lumen est une unit\u00e9 d\u00e9riv\u00e9e de la candela (1 candela \u00e9quivaut \u00e0 1 lumen par st\u00e9radian), alors que la candela est une unit\u00e9 de base (elle repr\u00e9sente la \u2018puissance candela du faisceau\u2019 de 1\/683 watts par st\u00e9radian pour la lumi\u00e8re monochromatique \u00e0 une fr\u00e9quence de 540 t\u00e9rahertz). Pour la lumi\u00e8re dont la longueur d'onde est diff\u00e9rente de 555,5 nanom\u00e8tres, le nombre de lumens par watt d'\u00e9nergie rayonn\u00e9e est diff\u00e9rent. Pour les longueurs d'onde autres que 555,5 nanom\u00e8tres, les lumens par watt correspondent \u00e0 683 multipli\u00e9 par la valeur de la fonction d'efficacit\u00e9 lumineuse photopique pour cette longueur d'onde, puis divis\u00e9 par la valeur de la fonction d'efficacit\u00e9 lumineuse photopique \u00e0 555,5 nanom\u00e8tres (je crois que cette valeur est tr\u00e8s proche de 1, mais pas exactement 1).<\/p>\n\t\t\n<style>\n#text-99823368 {\n  font-size: 0.75rem;\n  line-height: 1.5;\n}\n@media (min-width:550px) {\n  #text-99823368 {\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_593522548\">\n\t\t\t\t\t\t\t\t<div class=\"img-inner dark\" style=\"margin:-60px 0px -40px 0px;\">\n\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"1536\" height=\"1024\" src=\"https:\/\/pergolalights.net\/wp-content\/uploads\/2025\/09\/assets_task_01k47ay5kve6ra2x5dctv9m6xd_1756888038_img_1.webp\" class=\"attachment-original size-original\" alt=\"lumen and candela\" srcset=\"https:\/\/pergolalights.net\/wp-content\/uploads\/2025\/09\/assets_task_01k47ay5kve6ra2x5dctv9m6xd_1756888038_img_1.webp 1536w, https:\/\/pergolalights.net\/wp-content\/uploads\/2025\/09\/assets_task_01k47ay5kve6ra2x5dctv9m6xd_1756888038_img_1-510x340.webp 510w, https:\/\/pergolalights.net\/wp-content\/uploads\/2025\/09\/assets_task_01k47ay5kve6ra2x5dctv9m6xd_1756888038_img_1-600x400.webp 600w, https:\/\/pergolalights.net\/wp-content\/uploads\/2025\/09\/assets_task_01k47ay5kve6ra2x5dctv9m6xd_1756888038_img_1-1200x800.webp 1200w, https:\/\/pergolalights.net\/wp-content\/uploads\/2025\/09\/assets_task_01k47ay5kve6ra2x5dctv9m6xd_1756888038_img_1-768x512.webp 768w, https:\/\/pergolalights.net\/wp-content\/uploads\/2025\/09\/assets_task_01k47ay5kve6ra2x5dctv9m6xd_1756888038_img_1-18x12.webp 18w\" sizes=\"auto, (max-width: 1536px) 100vw, 1536px\" \/>\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_593522548 {\n  width: 100%;\n}\n<\/style>\n\t<\/div>\n\t\n\t<div id=\"text-936698376\" class=\"text\">\n\t\t\n<p><strong><b>Lumens<\/b><\/strong>\u00a0par watt est un indicateur de l'efficacit\u00e9 de la conversion de l'\u00e9nergie \u00e9lectrique en \u00e9nergie lumineuse. En multipliant cette valeur par la puissance consomm\u00e9e par une DEL, on obtient son flux lumineux (en lumens). Les LED rouges, orange, jaunes ou jaunes-vertes typiques pr\u00e9sentent une chute de tension d'environ 2 volts et consomment environ 0,04 watt pour un courant standard de 20 milliamp\u00e8res. En revanche, les DEL bleues, blanches ou vertes non jaun\u00e2tres pr\u00e9sentent g\u00e9n\u00e9ralement une chute de tension de 3,5 volts \u00e0 20 milliamp\u00e8res, ce qui se traduit par une consommation d'\u00e9nergie de 0,07 watt.<\/p>\n\t\t\n<style>\n#text-936698376 {\n  font-size: 0.75rem;\n  line-height: 1.5;\n}\n@media (min-width:550px) {\n  #text-936698376 {\n    font-size: 1.1rem;\n    line-height: 2;\n  }\n}\n<\/style>\n\t<\/div>\n\t\n\t\t<\/div>\n\t\t\t\t\n<style>\n#col-1274428473 > .col-inner {\n  margin: 0px 0px -25px 0px;\n}\n<\/style>\n\t<\/div>\n\n\t\n<\/div>\n<div class=\"row align-center\"  id=\"row-1353769454\">\n\n\t<div id=\"col-512972083\" 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-3703804008\" class=\"text\">\n\t\t\n<p>La candela est le nombre de lumens par st\u00e9radian, \u00e9galement connu sous le nom de \u2018puissance de la bougie lumineuse\u2019. (En pratique, comme indiqu\u00e9 pr\u00e9c\u00e9demment, la candela est l'unit\u00e9 m\u00e9trique fondamentale, tandis que le lumen est d\u00e9fini en fonction de la candela). Par cons\u00e9quent, le lumen est \u00e9gal \u00e0 la candela multipli\u00e9e par l'angle solide couvert par le faisceau. Id\u00e9alement, la candela est \u00e9gale au lumen divis\u00e9 par l'angle solide couvert par le faisceau - en supposant que toute la lumi\u00e8re est contenue dans le faisceau et que la \u2018puissance de la candela\u2019 dans le faisceau est constante.<\/p>\n\t\t\n<style>\n#text-3703804008 {\n  font-size: 0.75rem;\n  line-height: 1.5;\n}\n@media (min-width:550px) {\n  #text-3703804008 {\n    font-size: 1.1rem;\n    line-height: 2;\n  }\n}\n<\/style>\n\t<\/div>\n\t\n\t<div id=\"text-2444977544\" class=\"text\">\n\t\t\n<p>You might well ask, what is sphericity? Sphericity is 1\/(4\u03c0) of the entire sphere, or 1\/(2\u03c0) of a hemisphere, equating to approximately 3283 \u2018square degrees\u2019. The formula for calculating sphericity based on beam angle is as follows: Sphericity = 2 \u00d7 \u03c0 \u00d7 (1 &#8211; cos(0.5 \u00d7 beam angle))<\/p>\n\t\t\n<style>\n#text-2444977544 {\n  font-size: 0.75rem;\n  line-height: 1.5;\n}\n@media (min-width:550px) {\n  #text-2444977544 {\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_2018439971\">\n\t\t\t\t\t\t\t\t<div class=\"img-inner dark\" style=\"margin:0px 0px 20px 0px;\">\n\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"2000\" height=\"991\" src=\"https:\/\/pergolalights.net\/wp-content\/uploads\/2025\/09\/formula_for_calculating_sphericity_based_on_beam_angle.webp\" class=\"attachment-original size-original\" alt=\"formula_for_calculating_sphericity_based_on_beam_angle\" srcset=\"https:\/\/pergolalights.net\/wp-content\/uploads\/2025\/09\/formula_for_calculating_sphericity_based_on_beam_angle.webp 2000w, https:\/\/pergolalights.net\/wp-content\/uploads\/2025\/09\/formula_for_calculating_sphericity_based_on_beam_angle-510x253.webp 510w, https:\/\/pergolalights.net\/wp-content\/uploads\/2025\/09\/formula_for_calculating_sphericity_based_on_beam_angle-800x396.webp 800w, https:\/\/pergolalights.net\/wp-content\/uploads\/2025\/09\/formula_for_calculating_sphericity_based_on_beam_angle-1400x694.webp 1400w, https:\/\/pergolalights.net\/wp-content\/uploads\/2025\/09\/formula_for_calculating_sphericity_based_on_beam_angle-768x381.webp 768w, https:\/\/pergolalights.net\/wp-content\/uploads\/2025\/09\/formula_for_calculating_sphericity_based_on_beam_angle-1536x761.webp 1536w, https:\/\/pergolalights.net\/wp-content\/uploads\/2025\/09\/formula_for_calculating_sphericity_based_on_beam_angle-18x9.webp 18w\" sizes=\"auto, (max-width: 2000px) 100vw, 2000px\" \/>\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_2018439971 {\n  width: 100%;\n}\n<\/style>\n\t<\/div>\n\t\n\t<div id=\"text-3325290685\" class=\"text\">\n\t\t\n<p>Par cons\u00e9quent, si l'on calcule l'angle sph\u00e9rique couvert par le faisceau et qu'on le multiplie par la valeur de la candela (ou 1\/1000e de la valeur de la millicandela), on obtient approximativement le flux lumineux (en lumens) ! Toutefois, comme le faisceau n'est pas uniform\u00e9ment r\u00e9parti et que toute la lumi\u00e8re n'est pas contenue dans le faisceau, ce calcul n'est qu'approximatif. Le calcul des lumens en fonction de l'angle du faisceau et de la candela peut facilement donner lieu \u00e0 des erreurs allant de +100% \u00e0 -50%. Pour les angles de faisceau de 8 degr\u00e9s ou moins, le flux lumineux r\u00e9el est g\u00e9n\u00e9ralement plus \u00e9lev\u00e9 que ce que pr\u00e9voit cette formule, car le faisceau nominal ne tient pas compte des faisceaux secondaires \u2018en halo\u2019 qui entourent souvent le faisceau principal. Il convient \u00e9galement de noter que certaines valeurs d'angle de faisceau sont trop optimistes, ce qui peut conduire \u00e0 des attentes exag\u00e9r\u00e9es concernant le flux lumineux r\u00e9el re\u00e7u.<\/p>\n\t\t\n<style>\n#text-3325290685 {\n  font-size: 0.75rem;\n  line-height: 1.5;\n}\n@media (min-width:550px) {\n  #text-3325290685 {\n    font-size: 1.1rem;\n    line-height: 2;\n  }\n}\n<\/style>\n\t<\/div>\n\t\n\t<div id=\"gap-494633269\" class=\"gap-element clearfix\" style=\"display:block; height:auto;\">\n\t\t\n<style>\n#gap-494633269 {\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-1344287431\">\n\n\t<div id=\"col-1203989165\" class=\"col medium-11 small-12 large-11\"  >\n\t\t\t\t<div class=\"col-inner text-center\" style=\"background-color:#bc7d4a;\" >\n\t\t\t\n\t\t\t\n\t<div id=\"text-3785823337\" class=\"text\">\n\t\t\n<h2><strong><b>4. <\/b><\/strong><b><\/b><strong>R\u00e9sum\u00e9<\/strong><\/h2>\n\t\t\n<style>\n#text-3785823337 {\n  font-size: 0.75rem;\n  line-height: 1.5;\n  color: rgb(255,255,255);\n}\n#text-3785823337 > * {\n  color: rgb(255,255,255);\n}\n@media (min-width:550px) {\n  #text-3785823337 {\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-1203989165 > .col-inner {\n  padding: 60px 0px 48px 0px;\n  border-radius: 7px;\n}\n<\/style>\n\t<\/div>\n\n\t\n<\/div>\n<div class=\"row align-center\"  id=\"row-1492860962\">\n\n\t<div id=\"col-1666181174\" 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-2166722451\" class=\"text\">\n\t\t\n<p>En r\u00e9sum\u00e9, les quatre unit\u00e9s optiques - lumen, lux, nit et candela - d\u00e9crivent chacune les propri\u00e9t\u00e9s de la lumi\u00e8re selon des perspectives distinctes, formant collectivement les crit\u00e8res essentiels par lesquels nous comprenons et mesurons l'\u00e9clairage.<\/p>\n<p>Lumens focus on the total amount of light emitted by a light source, quantifying luminous flux to indicate how much light a source can produce; lux, however, concerns the luminous flux received per unit area by an illuminated object, reflecting the degree to which an object is lit and revealing how brightly a surface is illuminated. The nit, as a unit of luminance, applies to area sources by combining luminous intensity with the emitting area. It is commonly used to describe the visual brightness of luminous surfaces such as displays. The candela, meanwhile, is the core metric for the luminous intensity of point sources. It characterises a light source&#8217;s ability to concentrate light in a specific direction, revealing how intensely the source itself emits light.<\/p>\n\t\t\n<style>\n#text-2166722451 {\n  font-size: 0.75rem;\n  line-height: 1.5;\n}\n@media (min-width:550px) {\n  #text-2166722451 {\n    font-size: 1.1rem;\n    line-height: 2;\n  }\n}\n<\/style>\n\t<\/div>\n\t\n\t<div id=\"gap-2106071936\" class=\"gap-element clearfix\" style=\"display:block; height:auto;\">\n\t\t\n<style>\n#gap-2106071936 {\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>","protected":false},"excerpt":{"rendered":"","protected":false},"author":1,"featured_media":3245,"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-3237","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 lumens, lux, nits, and candela? 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