{"id":37594,"date":"2025-11-23T21:38:42","date_gmt":"2025-11-23T13:38:42","guid":{"rendered":"https:\/\/tecolite.com\/?p=37594"},"modified":"2026-03-03T03:35:51","modified_gmt":"2026-03-02T19:35:51","slug":"comment-choisir-le-bon-angle-de-faisceau-led-pour-leclairage-architectural-guide-gu10-mr16-ar111","status":"publish","type":"post","link":"https:\/\/tecolite.com\/fr\/how-to-choose-the-right-led-beam-angle-for-architectural-lighting-gu10-mr16-ar111-guide\/","title":{"rendered":"Comment choisir le bon angle de faisceau LED pour l'\u00e9clairage architectural : Guide GU10, MR16 et AR111"},"content":{"rendered":"<h2>Comment choisir le bon angle de faisceau LED pour l'\u00e9clairage architectural : Guide GU10, MR16 et AR111<\/h2>\n<p>Murs irr\u00e9guliers. Points chauds au sol. \u00c9blouissement dans les yeux des personnes.<br \/>\nLa plupart des probl\u00e8mes de \u201c mauvais \u00e9clairage \u201d dans les projets architecturaux se r\u00e9sument \u00e0 une chose : le mauvais angle de faisceau.<\/p>\n<p>Pour les projecteurs architecturaux comme les GU10, MR16 et AR111, l'angle du faisceau d\u00e9termine o\u00f9 va la lumi\u00e8re, son intensit\u00e9 apparente sur la surface et le nombre de luminaires r\u00e9ellement n\u00e9cessaires. Le choisir correctement permet d'obtenir un \u00e9clairage net et intentionnel avec moins de watts et moins d'appareils. Une erreur entra\u00eene des retouches, des plaintes et un gaspillage d'\u00e9nergie.<\/p>\n<p>Ce guide parcourt l'aspect pratique des angles de faisceau pour le travail architectural \u2013 ce qu'ils sont, comment ils se comportent \u00e0 diff\u00e9rentes hauteurs de montage, et comment choisir correctement pour des projets r\u00e9els, sans r\u00e9f\u00e9rence \u00e0 des marques sp\u00e9cifiques.<\/p>\n<hr \/>\n<h2>1. Bases de l'angle de faisceau \u2013 Ce que vous sp\u00e9cifiez r\u00e9ellement<\/h2>\n<p><img decoding=\"async\" src=\"https:\/\/tecolite.com\/wp-content\/uploads\/2025\/11\/Beam-Angle-Basics-for-LED-Spotlights.webp\" alt=\"infographic showing narrow medium and wide LED beam angles with degree ranges for lighting design\" \/><\/p>\n<h3>1.1 Qu'est-ce que l'angle du faisceau ?<\/h3>\n<p>En \u00e9clairage architectural, <strong>angle du faisceau<\/strong> est d\u00e9fini comme l'angle entre les deux directions o\u00f9 l'intensit\u00e9 lumineuse tombe \u00e0 <strong>50\u202f% du maximum<\/strong> au centre du faisceau. C'est la d\u00e9finition utilis\u00e9e dans la photom\u00e9trie IES et CIE pour les distributions de faisceau.<br \/>\n(Voir IES TM-15 et les publications CIE sur les d\u00e9finitions de distribution de faisceau :<br \/>\n\u2013 Illuminating Engineering Society : <a href=\"https:\/\/ies.org\">https:\/\/ies.org<\/a><br \/>\n\u2013 Commission internationale de l'\u00e9clairage (CIE) : <a href=\"https:\/\/cie.co.at\">https:\/\/cie.co.at<\/a>)<\/p>\n<p>En termes simples : l'angle du faisceau d\u00e9finit la largeur ou l'\u00e9troitesse du c\u00f4ne de lumi\u00e8re.<\/p>\n<ul>\n<li><strong>Faisceau \u00e9troit (\u224810\u201320\u00b0) :<\/strong> spot serr\u00e9, haute intensit\u00e9 sur une petite zone.<\/li>\n<li><strong>Faisceau moyen (\u224824\u201340\u00b0) :<\/strong> faisceau d'accentuation ou de t\u00e2che typique.<\/li>\n<li><strong>Faisceau large (\u224860\u2013120\u00b0) :<\/strong> flood ou ambiance g\u00e9n\u00e9rale.<\/li>\n<\/ul>\n<p>De nombreux fabricants publient \u00e9galement <strong>angle de champ<\/strong>, g\u00e9n\u00e9ralement mesur\u00e9 \u00e0 10\u202f% de l'intensit\u00e9 maximale. L'angle de champ est toujours plus large que l'angle de faisceau et vous renseigne davantage sur le \u201c bord doux \u201d de la lumi\u00e8re.<\/p>\n<h3>1.2 Angle du faisceau vs. niveau de lumi\u00e8re sur la surface<\/h3>\n<p>Pour un flux lumineux donn\u00e9, <strong>les faisceaux \u00e9troits d\u00e9livrent un lux plus \u00e9lev\u00e9<\/strong> sur la surface cible ; les faisceaux larges r\u00e9partissent les m\u00eames lumens sur une plus grande surface.<\/p>\n<p>\u00c0 une hauteur de montage fixe, vous pouvez approximer le diam\u00e8tre du faisceau sur le sol ou le mur :<\/p>\n<p>Diam\u00e8tre du faisceau \u2248 2 \u00d7 (hauteur de montage) \u00d7 tan(angle du faisceau \u00f7 2)<\/p>\n<p>Vous n'avez pas besoin de faire la trigonom\u00e9trie sur place \u2013 la plupart des logiciels de calcul d'\u00e9clairage (Dialux, Relux, AGi32) int\u00e8grent cela automatiquement en utilisant les fichiers IES ou EULUMDAT complets. Mais comprendre la relation vous aide \u00e0 v\u00e9rifier intuitivement les r\u00e9sultats.<\/p>\n<h3>1.3 Plages d'angle de faisceau typiques<\/h3>\n<p>Diff\u00e9rentes lampes et modules ont naturellement tendance \u00e0 se situer dans certaines plages :<\/p>\n<table>\n<thead>\n<tr>\n<th>Classification<\/th>\n<th>Angle de faisceau typique<\/th>\n<th>Cas d'utilisation typique<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Spot tr\u00e8s \u00e9troit<\/td>\n<td>8\u201315\u00b0<\/td>\n<td>Accents de plafond haut, colonnes, sculptures<\/td>\n<\/tr>\n<tr>\n<td>Spot \u00e9troit<\/td>\n<td>15\u201324\u00b0<\/td>\n<td>Accent d'objet, mises en avant de la vente au d\u00e9tail<\/td>\n<\/tr>\n<tr>\n<td>Spot<\/td>\n<td>24\u201336\u00b0<\/td>\n<td>Accent g\u00e9n\u00e9ral, murs d'ornement<\/td>\n<\/tr>\n<tr>\n<td>Inondation<\/td>\n<td>36\u201360\u00b0<\/td>\n<td>Petites pi\u00e8ces, espaces de circulation<\/td>\n<\/tr>\n<tr>\n<td>Large inondation<\/td>\n<td>60\u201390\u00b0<\/td>\n<td>Ambiance plafond bas<\/td>\n<\/tr>\n<tr>\n<td>Tr\u00e8s large \/ diffus<\/td>\n<td>90\u2013120\u00b0<\/td>\n<td>\u00c9clairage g\u00e9n\u00e9ral indirect ou diffus<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Ces plages sont coh\u00e9rentes avec de nombreuses biblioth\u00e8ques photom\u00e9triques commerciales et avec la fa\u00e7on dont le Guide de l'\u00e9clairage IES cat\u00e9gorise les types de faisceaux.<\/p>\n<hr \/>\n<h2>2. Pourquoi l'angle de faisceau est important dans l'\u00e9clairage architectural<\/h2>\n<p><img decoding=\"async\" src=\"https:\/\/tecolite.com\/wp-content\/uploads\/2025\/11\/Why-Beam-Angle-Matters-in-Architectural-Lighting.webp\" alt=\"architectural lighting comparison showing narrow medium and wide beam angles on interior wall\" \/><\/p>\n<h3>2.1 Esth\u00e9tique et composition<\/h3>\n<p>L'\u00e9clairage architectural ne se r\u00e9sume pas \u00e0 \u201c suffisamment de lumens \u201d, mais plut\u00f4t \u00e0 <strong>o\u00f9 la luminance est plac\u00e9e<\/strong>:<\/p>\n<ul>\n<li><strong>Faisceaux \u00e9troits<\/strong> cr\u00e9ez <strong>contraste<\/strong> et concentrez-vous : murs de niche, \u0153uvres d'art, texture de la pierre, niches d'exposition.<\/li>\n<li><strong>Faisceaux moyens<\/strong> d\u00e9finir les zones : tables, espaces assis, pr\u00e9sentoirs.<\/li>\n<li><strong>Faisceaux larges<\/strong> construisez la couche de base de luminosit\u00e9 et de s\u00e9curit\u00e9 visuelle.<\/li>\n<\/ul>\n<p>Le syst\u00e8me visuel humain est tr\u00e8s sensible au contraste et aux zones lumineuses dans le champ de vision. Un mauvais choix de faisceau est l'un des moyens les plus rapides de cr\u00e9er de l'\u00e9blouissement et de l'inconfort visuel, m\u00eame si le niveau moyen de lux est correct.<\/p>\n<p>Les normes comme <strong>EN 12464-1<\/strong> pour les lieux de travail int\u00e9rieurs, mettez l'accent \u00e0 la fois sur les niveaux d'\u00e9clairement (lux) et <strong>uniformit\u00e9<\/strong> pour le confort visuel et la s\u00e9curit\u00e9 :<br \/>\n<a href=\"https:\/\/standards.iteh.ai\/catalog\/standards\/cen\/7e8f4fab-2f27-4ac5-bdb9-53e97961e84a\/en-12464-1-2021\">https:\/\/standards.iteh.ai\/catalog\/standards\/cen\/7e8f4fab-2f27-4ac5-bdb9-53e97961e84a\/en-12464-1-2021<\/a><\/p>\n<h3>2.2 \u00c9nergie et nombre de luminaires<\/h3>\n<p>L'angle de faisceau impacte directement :<\/p>\n<ul>\n<li><strong>Combien de luminaires vous avez besoin<\/strong> pour atteindre le lux requis.<\/li>\n<li><strong>L'efficacit\u00e9 avec laquelle chaque watt est utilis\u00e9<\/strong> sur la cible r\u00e9elle (sol, produit, \u0153uvre d'art, fa\u00e7ade) au lieu de se r\u00e9pandre sur les plafonds et les murs vides.<\/li>\n<\/ul>\n<p>Choisir un angle qui correspond \u00e0 la t\u00e2che vous permet g\u00e9n\u00e9ralement de :<\/p>\n<ul>\n<li>R\u00e9duire la sur-illumination et <strong>r\u00e9duire la charge connect\u00e9e<\/strong>.<\/li>\n<li>\u00c9vitez d'ajouter des luminaires suppl\u00e9mentaires plus tard pour \u201c combler les zones sombres \u201d.\u201d<\/li>\n<\/ul>\n<h3>2.3 \u00c9blouissement et confort visuel<\/h3>\n<p>L'\u00e9blouissement est influenc\u00e9 par <strong>luminance dans le champ de vision<\/strong>, hauteur de montage et direction. Les faisceaux \u00e9troits dirig\u00e9s n\u00e9gligemment \u00e0 hauteur des yeux peuvent facilement d\u00e9passer les seuils de confort.<\/p>\n<p>Des m\u00e9triques comme <strong>Indice d'\u00e9blouissement unifi\u00e9 (UGR)<\/strong>, d\u00e9finis par la CIE, sont utilis\u00e9s pour \u00e9valuer l'\u00e9blouissement d'inconfort dans les environnements int\u00e9rieurs :<br \/>\n<a href=\"https:\/\/cie.co.at\/publications\/discomfort-glare-interior-lighting\">https:\/\/cie.co.at\/publications\/discomfort-glare-interior-lighting<\/a><\/p>\n<p>L'angle du faisceau n'appara\u00eet pas directement dans la formule UGR, mais il affecte la <strong>luminance apparente<\/strong> et <strong>taille de la zone lumineuse<\/strong>, qui influencent fortement le r\u00e9sultat. Pour un faible \u00e9blouissement :<\/p>\n<ul>\n<li>\u00c9vitez les faisceaux \u00e9troits \u00e0 faible hauteur de montage dirig\u00e9s \u00e0 travers les zones d'assise.<\/li>\n<li>Utilisez des faisceaux plus larges ou des optiques blind\u00e9es lorsque les luminaires sont en vue directe.<\/li>\n<\/ul>\n<hr \/>\n<h2>3. Comparaison des GU10, MR16 et AR111 pour un usage architectural<\/h2>\n<p>Les trois familles de formats les plus courantes pour l'\u00e9clairage d'accentuation architectural \u2013 <strong>GU10, MR16 et AR111<\/strong> \u2013 chacun se situe dans une plage optimale diff\u00e9rente d'angle de faisceau, de style de fixation et d'application.<\/p>\n<h3>3.1 GU10 \u2013 Projecteur compact sur tension secteur<\/h3>\n<ul>\n<li><strong>Base :<\/strong> GU10 \u00e0 ba\u00efonnette.<\/li>\n<li><strong>Power:<\/strong> Typically 4\u20137 W LED for 35\u201350 W halogen replacement.<\/li>\n<li><strong>Common beam angles:<\/strong> roughly 24\u00b0, 36\u00b0, 40\u00b0, sometimes 10\u201315\u00b0 or 60\u00b0 variants.<\/li>\n<\/ul>\n<p>Typical uses:<\/p>\n<ul>\n<li>Low to medium ceiling (2.5\u20133.5 m) accent lighting.<\/li>\n<li>Tracks, adjustable downlights, small feature ceilings.<\/li>\n<li>Retrofits where existing GU10 halogens were used.<\/li>\n<\/ul>\n<h3>3.2 MR16 \u2013 Low-voltage versatility<\/h3>\n<ul>\n<li><strong>Form factor:<\/strong> 50 mm diameter multifaceted reflector (MR).<\/li>\n<li><strong>Base :<\/strong> Most commonly GU5.3 (12 V).<\/li>\n<li><strong>Beam options:<\/strong> from very narrow (10\u201315\u00b0) to wide floods (60\u00b0+), depending on optics.<\/li>\n<\/ul>\n<p>Typical uses:<\/p>\n<ul>\n<li>Recessed downlights in hospitality and residential.<\/li>\n<li>Accent lighting where low voltage is preferred.<\/li>\n<li>Retrofits with existing MR16 infrastructure.<\/li>\n<\/ul>\n<h3>3.3 AR111 \u2013 Large-aperture architectural accent<\/h3>\n<ul>\n<li><strong>Diameter:<\/strong> ~111 mm.<\/li>\n<li><strong>Beam options:<\/strong> common ranges from 8\u201312\u00b0 very narrow, through 24\u201340\u00b0 spots, up to 60\u00b0 floods.<\/li>\n<li><strong>Output:<\/strong> often higher lumen packages suited to tall spaces.<\/li>\n<\/ul>\n<p>Typical uses:<\/p>\n<ul>\n<li>Double-height lobbies.<\/li>\n<li>Retail feature walls, window displays.<\/li>\n<li>Museum, gallery, and facade grazing from longer throws.<\/li>\n<\/ul>\n<h3>3.4 Quick comparison table<\/h3>\n<table>\n<thead>\n<tr>\n<th>Param\u00e8tre<\/th>\n<th>GU10<\/th>\n<th>MR16<\/th>\n<th>AR111<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Diam\u00e8tre<\/td>\n<td>~50 mm<\/td>\n<td>~50 mm<\/td>\n<td>~111 mm<\/td>\n<\/tr>\n<tr>\n<td>Typical voltage<\/td>\n<td>220\u2013240 V (or 120 V)<\/td>\n<td>12 V (with driver\/transformer)<\/td>\n<td>220\u2013240 V (or 120 V), some LV<\/td>\n<\/tr>\n<tr>\n<td>Typical beam range<\/td>\n<td>24\u201360\u00b0<\/td>\n<td>10\u201360\u00b0<\/td>\n<td>8\u201360\u00b0<\/td>\n<\/tr>\n<tr>\n<td>Meilleure utilisation<\/td>\n<td>Low\/medium ceilings, retrofits<\/td>\n<td>Recessed\/tunable ceiling layouts<\/td>\n<td>Long-throw accents, high ceilings<\/td>\n<\/tr>\n<tr>\n<td>Mounting<\/td>\n<td>Track, surface, recessed<\/td>\n<td>Recessed, track<\/td>\n<td>Gimbal, tracks, surface multiples<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>(Geometries and use-cases are broadly aligned with common MR and AR reflector standards, e.g. IEC lamp caps and holder standards: <a href=\"https:\/\/webstore.iec.ch\">https:\/\/webstore.iec.ch<\/a>)<\/p>\n<hr \/>\n<h2>4. How to Select the Right Beam Angle \u2013 A Practical Method<\/h2>\n<p><img decoding=\"async\" src=\"https:\/\/tecolite.com\/wp-content\/uploads\/2025\/11\/How-to-Select-the-Right-Beam-Angle-\u2013-Step-by-Step-Guide.webp\" alt=\"Infographic showing four steps to select the correct LED beam angle with lamp illustration and light cone.\" \/><\/p>\n<p>Rather than guessing, you can treat beam angle selection as a simple process:<\/p>\n<ol>\n<li>Define <strong>task and visual emphasis<\/strong>.<\/li>\n<li>Note <strong>mounting height and distance to target<\/strong>.<\/li>\n<li>Decide <strong>target size<\/strong> (table, painting, column section, wall panel).<\/li>\n<li>Choose beam angle so the <strong>beam just covers the target<\/strong> with a bit of overlap.<\/li>\n<li>Verify in a quick calculation or simulation.<\/li>\n<\/ol>\n<h3>4.1 Step 1 \u2013 Decide what you are lighting<\/h3>\n<p>Common architectural lighting goals:<\/p>\n<ul>\n<li><strong>Task surfaces:<\/strong> worktops, reception desks, conference tables.<\/li>\n<li><strong>Verticals:<\/strong> feature walls, shelving, merchandise, artwork.<\/li>\n<li><strong>Architectural elements:<\/strong> columns, arches, niches, textures.<\/li>\n<li><strong>Ambient layer:<\/strong> general brightness to meet safety\/standard lux levels.<\/li>\n<\/ul>\n<p>Beam angle should follow the <strong>size and nature of the target<\/strong>, not the fixture catalogue order.<\/p>\n<h3>4.2 Step 2 \u2013 Account for mounting height<\/h3>\n<p>Higher mounting heights require <strong>either wider beams<\/strong> to maintain coverage, or <strong>higher output \/ narrower beams<\/strong> if you need strong accents from a distance.<\/p>\n<p>Approximate \u201crule of thumb\u201d beams vs height for typical architectural use:<\/p>\n<table>\n<thead>\n<tr>\n<th>Mounting Height<\/th>\n<th>Accent on Small Feature (0.5\u20131 m wide)<\/th>\n<th>Accent on Medium Feature (1\u20132 m wide)<\/th>\n<th>General Area Lighting<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>2.5\u20133 m<\/td>\n<td>15\u201324\u00b0<\/td>\n<td>24\u201336\u00b0<\/td>\n<td>36\u201360\u00b0<\/td>\n<\/tr>\n<tr>\n<td>3\u20134 m<\/td>\n<td>10\u201320\u00b0<\/td>\n<td>20\u201330\u00b0<\/td>\n<td>40\u201360\u00b0<\/td>\n<\/tr>\n<tr>\n<td>4\u20136 m<\/td>\n<td>8\u201315\u00b0<\/td>\n<td>15\u201324\u00b0<\/td>\n<td>30\u201340\u00b0 (plus uplight)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Use these as starting points, then refine in software.<\/p>\n<h3>4.3 Step 3 \u2013 Balance contrast vs uniformity<\/h3>\n<p>Standards such as EN 12464-1 and IES recommendations emphasise both <strong>average illuminance<\/strong> et <strong>uniformit\u00e9<\/strong> on task areas. For many interior applications:<\/p>\n<ul>\n<li>Offices: 300\u2013500 lux on workplanes, with uniformity \u2265 0.6.<\/li>\n<li>Retail: 300\u20131000 lux, with higher contrast on merchandise.<\/li>\n<li>Museums\/galleries: strong contrast is encouraged, but with careful glare control.<\/li>\n<\/ul>\n<p>References:<br \/>\n\u2013 EN 12464-1 (Indoor workplace lighting): see European standards listings.<br \/>\n\u2013 IES Lighting Handbook: <a href=\"https:\/\/ies.org\">https:\/\/ies.org<\/a><\/p>\n<p>In practice:<\/p>\n<ul>\n<li>Utiliser <strong>narrower beams<\/strong> for highlight layers (1:3\u20131:10 contrast vs ambient).<\/li>\n<li>Utiliser <strong>wider beams or indirect light<\/strong> for ambient, so that the eye isn\u2019t constantly jumping between very bright and very dark areas.<\/li>\n<\/ul>\n<hr \/>\n<h2>5. Typical Beam Angle Choices by Application<\/h2>\n<p><img decoding=\"async\" src=\"https:\/\/tecolite.com\/wp-content\/uploads\/2025\/11\/Typical-Beam-Angle-Choices-by-Application.webp\" alt=\"Infographic showing typical LED beam angle choices for lobby, office, retail, museum, and facade lighting, with icons under yellow cones and angle ranges.\" \/><\/p>\n<p>Below are practical examples that specifiers often converge on in architectural work. Numbers are indicative \u2013 always confirm with photometry and local codes.<\/p>\n<h3>5.1 Lobby and reception<\/h3>\n<p>Goals: welcoming atmosphere, clear wayfinding, emphasis on reception desk and features.<\/p>\n<p>Typical choices:<\/p>\n<ul>\n<li>\n<p><strong>Ceiling height 3\u20134 m<\/strong><\/p>\n<ul>\n<li>General ambient: 40\u201360\u00b0 MR16 or GU10 downlights.<\/li>\n<li>Desk highlight: 20\u201330\u00b0 spots aimed at counter.<\/li>\n<li>Feature wall \/ logo: 15\u201324\u00b0 spots.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<table>\n<thead>\n<tr>\n<th>\u00c9l\u00e9ment<\/th>\n<th>Suggested Source<\/th>\n<th>Angle du faisceau<\/th>\n<th>Notes<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Reception desk<\/td>\n<td>GU10 \/ MR16<\/td>\n<td>20\u201330\u00b0<\/td>\n<td>Aim from 25\u201335\u00b0 off vertical<\/td>\n<\/tr>\n<tr>\n<td>Feature wall<\/td>\n<td>AR111 or MR16<\/td>\n<td>15\u201324\u00b0<\/td>\n<td>Overlap beams slightly<\/td>\n<\/tr>\n<tr>\n<td>Ambient ceiling<\/td>\n<td>GU10 \/ MR16<\/td>\n<td>40\u201360\u00b0<\/td>\n<td>Keep UGR within comfort range<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>5.2 Offices and meeting rooms<\/h3>\n<p>Goals: compliance with lux levels, low glare, flexibility.<\/p>\n<ul>\n<li>Workplane targets (per EN 12464-1): 300\u2013500 lux with good uniformity.<\/li>\n<li>Beam angle is usually <strong>medium to wide<\/strong>; accent layers are optional.<\/li>\n<\/ul>\n<p>Typical:<\/p>\n<ul>\n<li>60\u201390\u00b0 beams in recessed or track luminaires for general lighting.<\/li>\n<li>Narrow accents (24\u201336\u00b0) only on specific surfaces (whiteboards, artwork).<\/li>\n<\/ul>\n<h3>5.3 Retail and hospitality<\/h3>\n<p>Goals: strong contrast on products, comfortable ambient for customers.<\/p>\n<ul>\n<li>Merchandise: 15\u201330\u00b0 beams (GU10, MR16, AR111) depending on mounting height.<\/li>\n<li>Ambient: 40\u201360\u00b0 beams, often with softer diffuse optics.<\/li>\n<\/ul>\n<table>\n<thead>\n<tr>\n<th>Area<\/th>\n<th>Mounting Height<\/th>\n<th>Recommended Beam<\/th>\n<th>Type<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Wall bays<\/td>\n<td>3 m<\/td>\n<td>15\u201324\u00b0<\/td>\n<td>GU10 \/ AR111<\/td>\n<\/tr>\n<tr>\n<td>Central displays<\/td>\n<td>3\u20134 m<\/td>\n<td>20\u201330\u00b0<\/td>\n<td>MR16 \/ AR111<\/td>\n<\/tr>\n<tr>\n<td>General ambient<\/td>\n<td>2.8\u20133.2 m<\/td>\n<td>40\u201360\u00b0<\/td>\n<td>MR16 \/ panel<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Lighting research (e.g., IES retail lighting guidance and CIE technical reports on museum\/retail lighting) shows that vertical illuminance and contrast significantly influence perceived brightness and merchandise appeal:<br \/>\n\u2013 IES RP-2 (Lighting for retail spaces): <a href=\"https:\/\/ies.org\">https:\/\/ies.org<\/a><br \/>\n\u2013 CIE publications on lighting for museums and galleries: <a href=\"https:\/\/cie.co.at\">https:\/\/cie.co.at<\/a><\/p>\n<h3>5.4 Museums and galleries<\/h3>\n<p>Goals: precise highlighting, controlled contrast, protection of sensitive materials.<\/p>\n<ul>\n<li>Narrow beams (8\u201315\u00b0) for small objects.<\/li>\n<li>15\u201324\u00b0 for paintings and large framed works.<\/li>\n<li>Strict glare control to avoid reflected highlights on glass.<\/li>\n<\/ul>\n<p>Beam angle works together with <strong>illuminance limits<\/strong> et <strong>spectral control<\/strong> informed by conservation guidelines (e.g., CIE 157 and museum lighting recommendations).<\/p>\n<h3>5.5 Facades and exterior accents<\/h3>\n<p>Goals: sculpt the building at night, avoid light trespass and sky glow.<\/p>\n<ul>\n<li>AR111 or dedicated outdoor spot modules used with 8\u201340\u00b0 beams for columns, pilasters and verticals.<\/li>\n<li>30\u201360\u00b0 beams for general wall washing \u2013 sometimes asymmetric beams or grazing optics.<\/li>\n<\/ul>\n<p>For exterior lighting, reference standards like <strong>CIE 150 (Guide on the Limitation of the Effects of Obtrusive Light)<\/strong>:<br \/>\n<a href=\"https:\/\/cie.co.at\/publications\/guide-limitation-effects-obtrusive-light-outdoor-lighting-installations-2nd-edition\">https:\/\/cie.co.at\/publications\/guide-limitation-effects-obtrusive-light-outdoor-lighting-installations-2nd-edition<\/a><\/p>\n<hr \/>\n<h2>6. Common Mistakes in Beam Angle Selection (and How to Avoid Them)<\/h2>\n<h3>Mistake 1 \u2013 Designing by lumen, not by task<\/h3>\n<p>Selecting fixtures only by lumen output, without considering beam angle, often leads to:<\/p>\n<ul>\n<li>Overlit hot spots directly under fixtures.<\/li>\n<li>Dark patches between fittings.<\/li>\n<\/ul>\n<p>Fix: always start from the <strong>target area<\/strong> et <strong>required illuminance<\/strong>, then choose beam angle and lumen package together.<\/p>\n<h3>Mistake 2 \u2013 Ignoring height and offset<\/h3>\n<p>Using the same beam angle for 2.5 m and 5 m ceiling heights gives completely different results:<\/p>\n<ul>\n<li>At double the height, the same beam covers roughly <strong>twice the diameter<\/strong> and delivers about <strong>\u00bc of the lux<\/strong> (inverse-square behaviour of illuminance).<\/li>\n<\/ul>\n<p>Fix: adjust beam angle or output according to mounting height, and verify with quick calculations or software.<\/p>\n<h3>Mistake 3 \u2013 Overusing very narrow beams<\/h3>\n<p>Very narrow beams look powerful in a dark sample room but can be:<\/p>\n<ul>\n<li>Unforgiving to aiming errors.<\/li>\n<li>Highly glaring if within normal viewing angles.<\/li>\n<\/ul>\n<p>Fix: reserve <strong>8\u201315\u00b0 beams<\/strong> for high ceilings or very discrete accents where you can carefully aim and shield; otherwise start around <strong>20\u201330\u00b0<\/strong> for accent work.<\/p>\n<h3>Mistake 4 \u2013 Mixing incompatible distributions<\/h3>\n<p>Even with the same nominal beam angle, different optics can have very different:<\/p>\n<ul>\n<li><strong>Peak-to-field ratios<\/strong> (strong centre vs soft centre).<\/li>\n<li>Spill light and glare behaviour.<\/li>\n<\/ul>\n<p>Fix: for critical spaces, use the <strong>same optical family<\/strong> or photometry from a single range so distributions blend well. Always read the <strong>intensity distribution curves<\/strong> in the IES\/EULUMDAT files.<\/p>\n<h3>Mistake 5 \u2013 No attention to vertical illuminance<\/h3>\n<p>Designs that only hit the horizontal lux targets (on floors or desks) can feel \u201cflat\u201d.<\/p>\n<p>Visual brightness in architecture is driven heavily by <strong>vertical surfaces<\/strong> \u2013 walls, faces, merchandise. Many standards and guides (IES, CIE) now emphasise vertical illuminance for perception and safety (e.g., for faces in offices and schools).<\/p>\n<p>Fix: allocate beam angles and aiming so that walls and vertical elements receive adequate light. This often means using <strong>medium beams<\/strong> aimed at walls in addition to general downlighting.<\/p>\n<hr \/>\n<h2>7. A Simple Workflow for Specifying Beam Angles<\/h2>\n<p>For architectural projects using GU10, MR16 or AR111, you can adopt a consistent workflow:<\/p>\n<ol>\n<li>\n<p><strong>List spaces and tasks<\/strong><\/p>\n<ul>\n<li>For each room\/zone, note use, ceiling height, key surfaces (tables, walls, displays).<\/li>\n<\/ul>\n<\/li>\n<li>\n<p><strong>Set lighting targets<\/strong><\/p>\n<ul>\n<li>Use EN 12464-1, IES recommendations or local standards to define target lux and uniformity for each area.<\/li>\n<\/ul>\n<\/li>\n<li>\n<p><strong>Choose lamp family and mounting<\/strong><\/p>\n<ul>\n<li>GU10 for compact retrofits and low ceilings.<\/li>\n<li>MR16 for flexible recessed schemes.<\/li>\n<li>AR111 for high ceilings or long throws.<\/li>\n<\/ul>\n<\/li>\n<li>\n<p><strong>Select provisional beam angles<\/strong><\/p>\n<ul>\n<li>Use the height\/beam tables in this guide as starting points.<\/li>\n<li>Decide which surfaces are accent vs ambient.<\/li>\n<\/ul>\n<\/li>\n<li>\n<p><strong>Run quick calculations<\/strong><\/p>\n<ul>\n<li>Load IES\/EULUMDAT files into Dialux, Relux, AGi32 or similar.<\/li>\n<li>Adjust beam angles and aiming until vertical and horizontal lux targets and contrast ratios are acceptable.<\/li>\n<\/ul>\n<\/li>\n<li>\n<p><strong>Check glare and comfort<\/strong><\/p>\n<ul>\n<li>For office- and workplace-type areas, verify UGR and uniformity against EN 12464-1 and CIE guidelines.<\/li>\n<li>Adjust mounting and optics if UGR is too high.<\/li>\n<\/ul>\n<\/li>\n<li>\n<p><strong>Mock up critical areas<\/strong><\/p>\n<ul>\n<li>For high-value spaces (entrance, feature walls, flagship retail), build a small on-site or showroom mockup with candidate beam angles to validate the design visually.<\/li>\n<\/ul>\n<\/li>\n<li>\n<p><strong>Document choices clearly<\/strong><\/p>\n<ul>\n<li>\n<p>On drawings and schedules, include:<\/p>\n<ul>\n<li>Lamp type (GU10 \/ MR16 \/ AR111)<\/li>\n<li>Beam angle (e.g., 24\u00b0, 36\u00b0)<\/li>\n<li>Mounting height and aiming notes<\/li>\n<\/ul>\n<\/li>\n<li>This avoids substitutions that accidentally change beam behaviour.<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n<hr \/>\n<h2>Conclusion<\/h2>\n<p>Beam angle is one of the most powerful \u2013 and most misunderstood \u2013 tools in architectural lighting.<\/p>\n<p>When you treat GU10, MR16 and AR111 not just as \u201clamp types\u201d but as <strong>beam delivery tools<\/strong>, you can:<\/p>\n<ul>\n<li>Shape spaces with intentional contrast.<\/li>\n<li>Hit lux and uniformity targets with fewer watts and fewer fittings.<\/li>\n<li>Reduce glare and visual fatigue for occupants.<\/li>\n<li>Avoid expensive re-aiming and retrofits after handover.<\/li>\n<\/ul>\n<p>Start from the task, respect the physics of height and distribution, and use standards and photometric data as your reference. With that approach, beam angle selection becomes a clear, repeatable part of your design process instead of guesswork \u2013 and your projects will look and perform better for it.<\/p>","protected":false},"excerpt":{"rendered":"<p>How to Choose the Right LED Beam Angle for Architectural Lighting: GU10, MR16 &amp; AR111 Guide Uneven walls. Hot spots on the floor. Glare in people\u2019s eyes. Most \u201cbad lighting\u201d problems in architectural projects come down to one thing: the wrong beam angle. For architectural spotlights like GU10, MR16 and AR111, beam angle decides where [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":38369,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_seopress_titles_title":"Choosing LED Beam Angles for GU10, MR16 and AR111 Spots","_seopress_titles_desc":"Learn how to choose the right LED beam angle for architectural lighting. A practical guide covering GU10, MR16 and AR111 applications, glare control and uniformity.","_seopress_robots_index":"","_seopress_robots_follow":"","_seopress_robots_imageindex":"","_seopress_robots_snippet":"","_seopress_robots_primary_cat":"none","_seopress_robots_breadcrumbs":"","_seopress_robots_freeze_modified_date":"","_seopress_robots_custom_modified_date":"","_seopress_robots_canonical":"","_seopress_social_fb_title":"","_seopress_social_fb_desc":"","_seopress_social_fb_img":"","_seopress_social_fb_img_attachment_id":0,"_seopress_social_fb_img_width":0,"_seopress_social_fb_img_height":0,"_seopress_social_twitter_title":"","_seopress_social_twitter_desc":"","_seopress_social_twitter_img":"","_seopress_social_twitter_img_attachment_id":0,"_seopress_social_twitter_img_width":0,"_seopress_social_twitter_img_height":0,"_seopress_redirections_value":"","_seopress_redirections_enabled":"","_seopress_redirections_enabled_regex":"","_seopress_redirections_logged_status":"both","_seopress_redirections_param":"","_seopress_redirections_type":301,"_seopress_analysis_target_kw":"","_seopress_news_disabled":"","_seopress_video_disabled":"","_seopress_video":[{"url":"","title":"","desc":"","thumbnail":"","duration":"","rating":"","view_count":"","tag":""}],"_seopress_pro_schemas_manual":[],"_seopress_pro_rich_snippets_disable_all":"","_seopress_pro_rich_snippets_disable":[],"_seopress_pro_schemas":[],"footnotes":""},"categories":[12],"tags":[],"class_list":["post-37594","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"acf":[],"_links":{"self":[{"href":"https:\/\/tecolite.com\/fr\/wp-json\/wp\/v2\/posts\/37594","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/tecolite.com\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/tecolite.com\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/tecolite.com\/fr\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/tecolite.com\/fr\/wp-json\/wp\/v2\/comments?post=37594"}],"version-history":[{"count":0,"href":"https:\/\/tecolite.com\/fr\/wp-json\/wp\/v2\/posts\/37594\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/tecolite.com\/fr\/wp-json\/wp\/v2\/media\/38369"}],"wp:attachment":[{"href":"https:\/\/tecolite.com\/fr\/wp-json\/wp\/v2\/media?parent=37594"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/tecolite.com\/fr\/wp-json\/wp\/v2\/categories?post=37594"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/tecolite.com\/fr\/wp-json\/wp\/v2\/tags?post=37594"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}