{"id":129540,"date":"2025-09-10T17:39:43","date_gmt":"2025-09-10T15:39:43","guid":{"rendered":"https:\/\/riverdi.com\/blog\/lux-vs-lumens-difference-between-lux-and-lumens"},"modified":"2025-09-10T17:39:43","modified_gmt":"2025-09-10T15:39:43","slug":"lux-vs-lumens-difference-between-lux-and-lumens","status":"publish","type":"post","link":"https:\/\/riverdi.com\/fr\/blog\/lux-vs-lumens-difference-between-lux-and-lumens","title":{"rendered":"Lux vs lumens &#8211; diff\u00e9rence entre lux et lumens"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_82_2 counter-hierarchy ez-toc-counter ez-toc-custom ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #002175;color:#002175\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #002175;color:#002175\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/riverdi.com\/fr\/blog\/lux-vs-lumens-difference-between-lux-and-lumens\/#Definitions_de_lux_et_lumens\" >D\u00e9finitions de lux et lumens<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/riverdi.com\/fr\/blog\/lux-vs-lumens-difference-between-lux-and-lumens\/#Lux_%E2%80%93_intensite_lumineuse\" >Lux &#8211; intensit\u00e9 lumineuse<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/riverdi.com\/fr\/blog\/lux-vs-lumens-difference-between-lux-and-lumens\/#Lumen_%E2%80%93_flux_lumineux\" >Lumen &#8211; flux lumineux<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/riverdi.com\/fr\/blog\/lux-vs-lumens-difference-between-lux-and-lumens\/#Differences_entre_lux_et_lumens\" >Diff\u00e9rences entre lux et lumens<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/riverdi.com\/fr\/blog\/lux-vs-lumens-difference-between-lux-and-lumens\/#Utilisation_des_lux_et_des_lumens\" >Utilisation des lux et des lumens<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/riverdi.com\/fr\/blog\/lux-vs-lumens-difference-between-lux-and-lumens\/#Evaluation_de_leclairement_de_la_surface\" >\u00c9valuation de l&rsquo;\u00e9clairement de la surface<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/riverdi.com\/fr\/blog\/lux-vs-lumens-difference-between-lux-and-lumens\/#Comparaison_des_sources_lumineuses\" >Comparaison des sources lumineuses<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/riverdi.com\/fr\/blog\/lux-vs-lumens-difference-between-lux-and-lumens\/#Impact_de_la_distance_sur_les_lux\" >Impact de la distance sur les lux<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/riverdi.com\/fr\/blog\/lux-vs-lumens-difference-between-lux-and-lumens\/#Distribution_de_la_lumiere_et_mesures\" >Distribution de la lumi\u00e8re et mesures<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/riverdi.com\/fr\/blog\/lux-vs-lumens-difference-between-lux-and-lumens\/#Methodes_de_mesure\" >M\u00e9thodes de mesure<\/a><\/li><\/ul><\/nav><\/div>\n<p>Entrez dans une pi\u00e8ce et allumez la lumi\u00e8re : vous avez l&rsquo;impression qu&rsquo;il fait clair, mais comment mesurer la luminosit\u00e9 ? Les \u00e9clairagistes ne se fient pas \u00e0 leurs suppositions ou \u00e0 leur intuition : ils utilisent des unit\u00e9s pr\u00e9cises. Deux des plus courantes sont le lux et le lumen. Ces termes apparaissent souvent sur l&#8217;emballage des lampes ou dans les plans d&rsquo;\u00e9clairage architecturaux, mais ils sont souvent mal compris. Conna\u00eetre la diff\u00e9rence n&rsquo;est pas seulement une question de th\u00e9orie, c&rsquo;est la base d&rsquo;une bonne conception dans les maisons, les bureaux, les usines et les espaces publics.    <\/p>\n<h2><span class=\"ez-toc-section\" id=\"Definitions_de_lux_et_lumens\"><\/span>D\u00e9finitions de lux et lumens<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"Lux_%E2%80%93_intensite_lumineuse\"><\/span>Lux &#8211; intensit\u00e9 lumineuse<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Le <strong>lux (lx<\/strong> ) mesure la quantit\u00e9 de lumi\u00e8re qui tombe r\u00e9ellement sur une surface. Techniquement, un lux \u00e9quivaut \u00e0 un lumen par m\u00e8tre carr\u00e9. En pratique, les lux vous indiquent dans quelle mesure une table, un sol ou un poste de travail est \u00e9clair\u00e9. En voici un exemple :   <\/p>\n<ul>\n<li>un jour ensoleill\u00e9 \u00e0 l&rsquo;ext\u00e9rieur peut atteindre 100 000 lux.<\/li>\n<li>un bureau typique devrait \u00eatre \u00e9clair\u00e9 \u00e0 environ 500 lux.<\/li>\n<li>une salle de s\u00e9jour peut n&rsquo;avoir besoin que de 100 \u00e0 200 lux pour \u00eatre confortable.<\/li>\n<\/ul>\n<p>Le lux est donc une mesure de l&rsquo;\u00e9clairage &#8211; non pas ce que produit une lampe, mais la sensation de luminosit\u00e9 d&rsquo;une zone.<\/p>\n<p><a href=\"https:\/\/riverdi.com\/fr\/blog\/nits-vs-lumens-vs-luminance-comprendre-les-mesures-de-luminosite-des-ecrans\"><img decoding=\"async\" class=\"size-full wp-image-126637 aligncenter\" src=\"https:\/\/riverdi.com\/wp-content\/uploads\/2025\/09\/POMIEDZY-TEKSTY_01-8.png\" alt=\"\" width=\"826\" height=\"480\" srcset=\"https:\/\/riverdi.com\/wp-content\/uploads\/2025\/09\/POMIEDZY-TEKSTY_01-8.png 826w, https:\/\/riverdi.com\/wp-content\/uploads\/2025\/09\/POMIEDZY-TEKSTY_01-8-300x174.png 300w, https:\/\/riverdi.com\/wp-content\/uploads\/2025\/09\/POMIEDZY-TEKSTY_01-8-768x446.png 768w, https:\/\/riverdi.com\/wp-content\/uploads\/2025\/09\/POMIEDZY-TEKSTY_01-8-600x349.png 600w, https:\/\/riverdi.com\/wp-content\/uploads\/2025\/09\/POMIEDZY-TEKSTY_01-8-64x37.png 64w\" sizes=\"(max-width: 826px) 100vw, 826px\" \/><\/a><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Lumen_%E2%80%93_flux_lumineux\"><\/span>Lumen &#8211; flux lumineux<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Le <strong>lumen (lm<\/strong> ) repr\u00e9sente la quantit\u00e9 totale de lumi\u00e8re \u00e9mise par une source dans toutes les directions. Les lumens repr\u00e9sentent la puissance brute d&rsquo;une ampoule ou d&rsquo;une LED. Une lampe de 1 000 lumens produit toujours 1 000 lumens, mais sa luminosit\u00e9 d\u00e9pend de la distance et de la distribution.  <\/p>\n<p>C&rsquo;est \u00e9galement la raison pour laquelle l&rsquo;efficacit\u00e9 est exprim\u00e9e en <strong>lumens par watt<\/strong> <strong>(lm\/W)<\/strong>, ce qui indique l&rsquo;efficacit\u00e9 avec laquelle un luminaire convertit l&rsquo;\u00e9nergie \u00e9lectrique en lumi\u00e8re visible.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Differences_entre_lux_et_lumens\"><\/span>Diff\u00e9rences entre lux et lumens<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>La diff\u00e9rence r\u00e9side dans la perspective :<\/p>\n<ul>\n<li>Les lumens mesurent la quantit\u00e9 de lumi\u00e8re produite.<\/li>\n<li>Le lux mesure la quantit\u00e9 de lumi\u00e8re qui arrive sur une surface donn\u00e9e.<\/li>\n<\/ul>\n<p>Par exemple, une lampe de 1000 lumens \u00e9clairant 1 m\u00b2 produit <strong>1000 lux<\/strong>. La m\u00eame lampe \u00e9clairant 10 m\u00b2 se propage plus finement et ne donne que 100 lux. C&rsquo;est pourquoi deux lampes de m\u00eame puissance lumineuse peuvent sembler tr\u00e8s diff\u00e9rentes dans la pratique : l&rsquo;une peut focaliser la lumi\u00e8re de mani\u00e8re \u00e9troite, l&rsquo;autre peut la diffuser largement.  <\/p>\n<p><img decoding=\"async\" class=\"size-full wp-image-126642 aligncenter\" src=\"https:\/\/riverdi.com\/wp-content\/uploads\/2025\/09\/POMIEDZY-TEKSTY_02-4.png\" alt=\"\" width=\"826\" height=\"448\" srcset=\"https:\/\/riverdi.com\/wp-content\/uploads\/2025\/09\/POMIEDZY-TEKSTY_02-4.png 826w, https:\/\/riverdi.com\/wp-content\/uploads\/2025\/09\/POMIEDZY-TEKSTY_02-4-300x163.png 300w, https:\/\/riverdi.com\/wp-content\/uploads\/2025\/09\/POMIEDZY-TEKSTY_02-4-768x417.png 768w, https:\/\/riverdi.com\/wp-content\/uploads\/2025\/09\/POMIEDZY-TEKSTY_02-4-600x325.png 600w, https:\/\/riverdi.com\/wp-content\/uploads\/2025\/09\/POMIEDZY-TEKSTY_02-4-64x35.png 64w\" sizes=\"(max-width: 826px) 100vw, 826px\" \/><\/p>\n<p>&nbsp;<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Utilisation_des_lux_et_des_lumens\"><\/span>Utilisation des lux et des lumens<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"Evaluation_de_leclairement_de_la_surface\"><\/span>\u00c9valuation de l&rsquo;\u00e9clairement de la surface<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Les architectes, les ing\u00e9nieurs et les d\u00e9corateurs d&rsquo;int\u00e9rieur utilisent les lux pour s&rsquo;assurer que chaque zone d&rsquo;activit\u00e9 est correctement \u00e9clair\u00e9e. Un comptoir de cuisine peut n\u00e9cessiter 500 \u00e0 600 lux pour une pr\u00e9paration s\u00fbre des aliments, tandis qu&rsquo;un couloir peut n&rsquo;avoir besoin que de 100 lux. Les r\u00e9glementations et les normes de conception (comme la norme EN 12464-1 en Europe) sp\u00e9cifient souvent les niveaux de lux requis pour les lieux de travail et les espaces publics.  <\/p>\n<h3><span class=\"ez-toc-section\" id=\"Comparaison_des_sources_lumineuses\"><\/span>Comparaison des sources lumineuses<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Les fabricants utilisent les lumens pour d\u00e9crire les performances de leurs produits. Une ampoule LED de 1500 lumens peut remplacer une lampe \u00e0 incandescence traditionnelle de 100 watts. Les lumens sont donc la mesure cl\u00e9 pour comparer l&rsquo;efficacit\u00e9 \u00e9nerg\u00e9tique et s\u00e9lectionner la puissance de lampe adapt\u00e9e \u00e0 un espace.  <\/p>\n<p><strong>Interpr\u00e9tation des mesures<\/strong><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Impact_de_la_distance_sur_les_lux\"><\/span>Impact de la distance sur les lux<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Plus la lumi\u00e8re se d\u00e9place, plus elle s&rsquo;\u00e9tale et s&rsquo;affaiblit. Ce ph\u00e9nom\u00e8ne est d\u00e9crit par la loi de l&rsquo;inverse du carr\u00e9 : si l&rsquo;on double la distance d&rsquo;une source, le lux tombe \u00e0 un quart. C&rsquo;est pourquoi un plafonnier situ\u00e9 \u00e0 trois m\u00e8tres semble plus faible sur le bureau que la m\u00eame lampe install\u00e9e \u00e0 un m\u00e8tre au-dessus.  <\/p>\n<h3><span class=\"ez-toc-section\" id=\"Distribution_de_la_lumiere_et_mesures\"><\/span>Distribution de la lumi\u00e8re et mesures<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>L&rsquo;angle du faisceau est \u00e9galement important. Un spot et un projecteur peuvent \u00e9mettre les m\u00eames lumens, mais le spot les concentre dans une petite zone, ce qui produit des lux \u00e9lev\u00e9s. Le projecteur les diffuse largement, ce qui r\u00e9duit les lux mais couvre plus d&rsquo;espace. Une bonne conception permet d&rsquo;\u00e9quilibrer la puissance lumineuse et la distribution afin d&rsquo;obtenir un \u00e9clairage coh\u00e9rent et confortable.   <\/p>\n<h2><span class=\"ez-toc-section\" id=\"Methodes_de_mesure\"><\/span>M\u00e9thodes de mesure<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Les niveaux de lux sont mesur\u00e9s \u00e0 l&rsquo;aide d&rsquo;un <strong>luxm\u00e8tre<\/strong>, un capteur qui capte la lumi\u00e8re incidente sur une surface. Les ing\u00e9nieurs effectuent souvent des relev\u00e9s en plusieurs points pour \u00e9tablir une carte de l&rsquo;\u00e9clairage, afin de garantir une r\u00e9partition uniforme. Les lumens, en revanche, sont g\u00e9n\u00e9ralement mesur\u00e9s dans des conditions de laboratoire contr\u00f4l\u00e9es, \u00e0 l&rsquo;aide d&rsquo;une <strong>sph\u00e8re d&rsquo;int\u00e9gration<\/strong> qui capte toute la lumi\u00e8re \u00e9mise.  <\/p>\n<p><strong>R\u00e9sum\u00e9<\/strong><\/p>\n<p>Comprendre la distinction entre les lux et les lumens permet aux professionnels, et m\u00eame aux utilisateurs quotidiens, de prendre de meilleures d\u00e9cisions. Les lumens indiquent la quantit\u00e9 de lumi\u00e8re produite par une source. Les lux indiquent dans quelle mesure cette lumi\u00e8re est utilis\u00e9e dans un espace. Ensemble, ils d\u00e9terminent si une pi\u00e8ce est accueillante, si un lieu de travail est s\u00fbr ou si une conception architecturale brille comme pr\u00e9vu.   <\/p>\n<p>Vous avez besoin de conseils d&rsquo;experts sur la conception ou la mesure de l&rsquo;\u00e9clairage ? <a href=\"https:\/\/riverdi.com\/fr\/contact\"><span style=\"font-weight: 400;\">Contactez les ing\u00e9nieurs de Riverdi<\/span><\/a> pour obtenir des conseils personnalis\u00e9s sur le choix de l&rsquo;\u00e9clairage adapt\u00e9 \u00e0 votre projet.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Entrez dans une pi\u00e8ce et allumez la lumi\u00e8re : vous avez l&rsquo;impression qu&rsquo;il fait clair, mais comment mesurer la luminosit\u00e9 ? Les \u00e9clairagistes ne se fient pas \u00e0 leurs suppositions ou \u00e0 leur intuition : ils utilisent des unit\u00e9s pr\u00e9cises. Deux des plus courantes sont le lux et le lumen. Ces termes apparaissent souvent sur [&hellip;]<\/p>\n","protected":false},"author":14,"featured_media":126648,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"content-type":"","inline_featured_image":false,"footnotes":""},"categories":[1457],"tags":[],"class_list":["post-129540","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-affichage-101"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Lux vs lumens - diff\u00e9rence entre lux et lumens - Riverdi<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/riverdi.com\/fr\/blog\/lux-vs-lumens-difference-between-lux-and-lumens\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Lux vs lumens - diff\u00e9rence entre lux et lumens - Riverdi\" \/>\n<meta property=\"og:description\" content=\"Entrez dans une pi\u00e8ce et allumez la lumi\u00e8re : vous avez l&rsquo;impression qu&rsquo;il fait clair, mais comment mesurer la luminosit\u00e9 ? Les \u00e9clairagistes ne se fient pas \u00e0 leurs suppositions ou \u00e0 leur intuition : ils utilisent des unit\u00e9s pr\u00e9cises. Deux des plus courantes sont le lux et le lumen. 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