{"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\/it\/what-are-lumens-lux-nits-and-candela\/","title":{"rendered":"Cosa sono i lumen, i lux, i nit e le candele?"},"content":{"rendered":"<div class=\"row align-center\"  id=\"row-585888367\">\n\n\t<div id=\"col-1092038777\" 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-1561303893\">\n\n\t<div id=\"col-900305182\" 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-3531869167\" class=\"text\">\n\t\t\n<h2><strong><b>1. <\/b><\/strong><strong>Prefazione<\/strong><\/h2>\n\t\t\n<style>\n#text-3531869167 {\n  font-size: 0.75rem;\n  color: rgb(255, 255, 255);\n}\n#text-3531869167 > * {\n  color: rgb(255, 255, 255);\n}\n@media (min-width:550px) {\n  #text-3531869167 {\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-900305182 > .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-3751762428\" class=\"text\">\n\t\t\n<p>Nella nostra vita quotidiana, la luce \u00e8 sempre presente: dalle lampade nelle nostre case ai display dei nostri telefoni cellulari, dalla luce del sole all'aperto alle luci al neon di notte. Ci circonda in una miriade di forme. Per descrivere le propriet\u00e0 della luce, sono indispensabili alcune unit\u00e0 fisiche specializzate: lumen, lux, nits e candele sono quattro delle pi\u00f9 importanti. Anche se apparentemente astratte, queste unit\u00e0 sono intrinsecamente legate alla nostra percezione della luce e alle sue applicazioni pratiche. Dalla scelta di lampadine di luminosit\u00e0 adeguata alla progettazione di effetti di visualizzazione per gli schermi, fino a campi specializzati come la fotografia e l'illuminotecnica, queste unit\u00e0 svolgono un ruolo indispensabile.<\/p>\n<p>Tuttavia, molte persone spesso trovano questi quattro concetti confusi, faticando a distinguere chiaramente i rispettivi significati e applicazioni. Pertanto, chiarire i concetti di queste quattro unit\u00e0 e definire le propriet\u00e0 ottiche che descrivono \u00e8 di grande importanza per comprendere e utilizzare meglio la luce.<\/p>\n\t\t\n<style>\n#text-3751762428 {\n  font-size: 0.75rem;\n  line-height: 1.5;\n}\n@media (min-width:550px) {\n  #text-3751762428 {\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_2046782071\">\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_2046782071 {\n  width: 100%;\n}\n<\/style>\n\t<\/div>\n\t\n\t<div id=\"gap-465712960\" class=\"gap-element clearfix\" style=\"display:block; height:auto;\">\n\t\t\n<style>\n#gap-465712960 {\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-818145518\">\n\n\t<div id=\"col-1542850794\" 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-3770535749\" class=\"text\">\n\t\t\n<h2><strong><b>2. <\/b><\/strong><strong>Concetto breve<\/strong><\/h2>\n\t\t\n<style>\n#text-3770535749 {\n  font-size: 0.75rem;\n  line-height: 1.5;\n  color: rgb(255,255,255);\n}\n#text-3770535749 > * {\n  color: rgb(255,255,255);\n}\n@media (min-width:550px) {\n  #text-3770535749 {\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-1542850794 > .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-679353581\">\n\n\t<div id=\"col-1166114420\" 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-3655751857\" class=\"text\">\n\t\t\n<p>1. Il lumen \u00e8 un'unit\u00e0 di misura della luce, simile al watt, ma la sua misurazione tiene conto della sensibilit\u00e0 dell'occhio umano. Quando si esaminano le specifiche di una sorgente luminosa, i lumen misurano l'emissione totale della sorgente, indipendentemente dalla direzione in cui viene emessa la luce.<\/p>\n<p>2. Lux indica il numero di lumen ricevuti per metro quadro. Nel linguaggio comune si parla di \u2018illuminamento\u2019, anche se nell'ambito dell'ottica si parla di \u2018illuminamento\u2019. Indica la quantit\u00e0 di luce che cade su una determinata superficie.<\/p>\n<p>3. Il nit \u00e8 il numero di lumen per metro quadrato per steradiante, che potremmo definire \u2018luminosit\u00e0\u2019 in termini quotidiani, anche se nel settore viene definito \u2018luminanza\u2019. Se un illuminamento di 1 lux cade su una superficie ideale che riflette la luce, produce una luminanza di 1 nit.<\/p>\n<p>4. Il candela \u00e8 il numero di lumen per steradiante. Si utilizza per le sorgenti luminose puntiformi, consentendo di calcolare la quantit\u00e0 di luce ricevuta da qualsiasi superficie illuminata, indipendentemente dalla sua posizione.<\/p>\n\t\t\n<style>\n#text-3655751857 {\n  font-size: 0.75rem;\n  line-height: 1.5;\n}\n@media (min-width:550px) {\n  #text-3655751857 {\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_202214736\">\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_202214736 {\n  width: 100%;\n}\n<\/style>\n\t<\/div>\n\t\n\t<div id=\"text-874232495\" class=\"text\">\n\t\t\n<p>In altre parole, la candela misura l'intensit\u00e0 luminosa attraverso una sfera immaginaria centrata sulla sorgente luminosa. Per una sorgente puntiforme isotropa, una candela equivale a un lumen per steradiante. Una sfera completa che circonda la sorgente luminosa comprende 4\u03c0 (circa 12,6) steradianti. Di conseguenza, una sorgente luminosa isotropa che emette 12,6 lumen produce un'intensit\u00e0 luminosa di 1 candela. Questo non si applica completamente ai laser tipici, ma per le sorgenti luminose come le lampade allo xeno ad arco corto costituisce un'approssimazione ragionevole. Tuttavia, la candela pu\u00f2 essere definita per una porzione di fascio divergente. Ad esempio, se il laser emette 1 lumen in un intervallo di soli 0,1 steradianti, la sua intensit\u00e0 luminosa sar\u00e0 di 10 candele.<\/p>\n\t\t\n<style>\n#text-874232495 {\n  font-size: 0.75rem;\n  line-height: 1.5;\n}\n@media (min-width:550px) {\n  #text-874232495 {\n    font-size: 1.1rem;\n    line-height: 2;\n  }\n}\n<\/style>\n\t<\/div>\n\t\n\t<div id=\"text-253628793\" class=\"text\">\n\t\t\n<p>Il foot-candle \u00e8 un'unit\u00e0 di misura dell'illuminamento. La Illuminating Engineering Society of North America lo definisce in ANSI\/IES RP-16-1996, Terminology of Lighting Engineering, come \u2018la densit\u00e0 superficiale del flusso luminoso incidente su un punto di una superficie\u2019.<\/p>\n\t\t\n<style>\n#text-253628793 {\n  font-size: 0.75rem;\n  line-height: 1.5;\n}\n@media (min-width:550px) {\n  #text-253628793 {\n    font-size: 1.1rem;\n    line-height: 2;\n  }\n}\n<\/style>\n\t<\/div>\n\t\n\t<div id=\"text-442191250\" 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-442191250 {\n  font-size: 0.75rem;\n  line-height: 1.5;\n}\n@media (min-width:550px) {\n  #text-442191250 {\n    font-size: 1.1rem;\n    line-height: 2;\n  }\n}\n<\/style>\n\t<\/div>\n\t\n\t<div id=\"text-1432166181\" class=\"text\">\n\t\t\n<p>Un foot-candle equivale a un lumen per piede quadrato (dove il lumen \u00e8 l'unit\u00e0 di misura del flusso luminoso o della quantit\u00e0 di luce).<\/p>\n\t\t\n<style>\n#text-1432166181 {\n  font-size: 0.75rem;\n  line-height: 1.5;\n}\n@media (min-width:550px) {\n  #text-1432166181 {\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_1366968213\">\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_1366968213 {\n  width: 100%;\n}\n<\/style>\n\t<\/div>\n\t\n\t<div id=\"text-1988988617\" 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-1988988617 {\n  font-size: 0.75rem;\n  line-height: 1.5;\n}\n@media (min-width:550px) {\n  #text-1988988617 {\n    font-size: 1.1rem;\n    line-height: 2;\n  }\n}\n<\/style>\n\t<\/div>\n\t\n\t<div id=\"text-1465028803\" class=\"text\">\n\t\t\n<p>La luminosit\u00e0 \u00e8 un fenomeno psicofisico che non pu\u00f2 essere misurato direttamente. Il termine \u201cluminosit\u00e0 fotometrica\u201d veniva usato in passato per indicare la luminanza, ma non \u00e8 pi\u00f9 utilizzato in contesti scientifici o ingegneristici.<\/p>\n\t\t\n<style>\n#text-1465028803 {\n  font-size: 0.75rem;\n  line-height: 1.5;\n}\n@media (min-width:550px) {\n  #text-1465028803 {\n    font-size: 1.1rem;\n    line-height: 2;\n  }\n}\n<\/style>\n\t<\/div>\n\t\n\t<div id=\"gap-1390419426\" class=\"gap-element clearfix\" style=\"display:block; height:auto;\">\n\t\t\n<style>\n#gap-1390419426 {\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-1947891330\">\n\n\t<div id=\"col-2048792452\" 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-2631882533\" class=\"text\">\n\t\t\n<h2><strong><b>3. <\/b><\/strong><strong>Definizione specifica<\/strong><\/h2>\n\t\t\n<style>\n#text-2631882533 {\n  font-size: 0.75rem;\n  line-height: 1.5;\n  color: rgb(255,255,255);\n}\n#text-2631882533 > * {\n  color: rgb(255,255,255);\n}\n@media (min-width:550px) {\n  #text-2631882533 {\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-2048792452 > .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-1878836390\" 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-2631376129\" class=\"text\">\n\t\t\n<p><strong><b>Definizione del lume<\/b><\/strong>: Il flusso luminoso di una luce monocromatica alla frequenza di 540 terahertz (o a una lunghezza d'onda di circa 555,5 nanometri) con una potenza di 1\/683 watt. Vale la pena notare che il lumen \u00e8 un'unit\u00e0 derivata basata sul candela (1 candela equivale a 1 lumen per steradiante), mentre il candela \u00e8 un'unit\u00e0 di base (rappresenta la \u2018potenza del candela del fascio\u2019 di 1\/683 watt per steradiante per la luce monocromatica alla frequenza di 540 terahertz). Per la luce con lunghezze d'onda diverse da 555,5 nanometri, il numero di lumen per watt di energia irradiata \u00e8 diverso. Per le lunghezze d'onda diverse da 555,5 nanometri, i lumen per watt corrispondono a 683 moltiplicato per il valore della funzione di efficienza luminosa fotopica per quella lunghezza d'onda, quindi diviso per il valore della funzione di efficienza luminosa fotopica a 555,5 nanometri (credo che questo valore sia molto vicino a 1, ma non esattamente 1).<\/p>\n\t\t\n<style>\n#text-2631376129 {\n  font-size: 0.75rem;\n  line-height: 1.5;\n}\n@media (min-width:550px) {\n  #text-2631376129 {\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_1624218482\">\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_1624218482 {\n  width: 100%;\n}\n<\/style>\n\t<\/div>\n\t\n\t<div id=\"text-3681516006\" class=\"text\">\n\t\t\n<p><strong><b>Lumen<\/b><\/strong>\u00a0per watt \u00e8 un indicatore dell'efficienza nella conversione dell'energia elettrica in energia luminosa. Moltiplicando questo valore per la potenza consumata da un LED si ottiene il suo flusso luminoso (in lumen). I tipici LED rossi, arancioni, gialli o giallo-verdi presentano una caduta di tensione di circa 2 volt e consumano circa 0,04 watt a una corrente standard di 20 milliampere. I LED blu, bianchi o verdi non gialli hanno invece una caduta di tensione di 3,5 volt a 20 milliampere, con un consumo di 0,07 watt.<\/p>\n\t\t\n<style>\n#text-3681516006 {\n  font-size: 0.75rem;\n  line-height: 1.5;\n}\n@media (min-width:550px) {\n  #text-3681516006 {\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-1878836390 > .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-1523539486\">\n\n\t<div id=\"col-695822233\" 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-519572856\" class=\"text\">\n\t\t\n<p>Il candela \u00e8 il numero di lumen per steradiante, noto anche come \u2018potenza della candela luminosa\u2019. (In pratica, come gi\u00e0 detto, la candela \u00e8 l'unit\u00e0 metrica fondamentale, mentre il lumen \u00e8 definito in termini di candela). Di conseguenza, il lumen \u00e8 uguale al candela moltiplicato per l'angolo solido coperto dal fascio. Idealmente, il candela \u00e8 uguale al lumen diviso per l'angolo solido coperto dal fascio, assumendo che tutta la luce sia contenuta nel fascio e che la \u2018potenza di candela\u2019 all'interno del fascio sia costante.<\/p>\n\t\t\n<style>\n#text-519572856 {\n  font-size: 0.75rem;\n  line-height: 1.5;\n}\n@media (min-width:550px) {\n  #text-519572856 {\n    font-size: 1.1rem;\n    line-height: 2;\n  }\n}\n<\/style>\n\t<\/div>\n\t\n\t<div id=\"text-3249653760\" 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-3249653760 {\n  font-size: 0.75rem;\n  line-height: 1.5;\n}\n@media (min-width:550px) {\n  #text-3249653760 {\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_1344007227\">\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_1344007227 {\n  width: 100%;\n}\n<\/style>\n\t<\/div>\n\t\n\t<div id=\"text-1372881292\" class=\"text\">\n\t\t\n<p>Pertanto, se si calcola l'angolo sferico coperto dal fascio e lo si moltiplica per il valore di candela (o 1\/1000 del valore di millicandela), si pu\u00f2 ottenere approssimativamente il flusso luminoso (in lumen)! Tuttavia, poich\u00e9 il fascio non \u00e8 distribuito in modo uniforme e non tutta la luce \u00e8 contenuta nel fascio, questo calcolo \u00e8 solo approssimativo. Il calcolo dei lumen in base all'angolo del fascio e ai candela pu\u00f2 facilmente produrre errori che vanno da +100% a -50%. Per angoli del fascio di 8 gradi o meno, l'emissione effettiva di lumen \u00e8 in genere superiore a quella prevista da questa formula, poich\u00e9 il fascio nominale non tiene conto dei fasci secondari \u2018aureolati\u2019 che spesso circondano il fascio principale. Si noti inoltre che alcuni valori dell'angolo di apertura del fascio sono eccessivamente ottimistici e possono portare ad aspettative gonfiate per quanto riguarda il flusso luminoso effettivo ricevuto.<\/p>\n\t\t\n<style>\n#text-1372881292 {\n  font-size: 0.75rem;\n  line-height: 1.5;\n}\n@media (min-width:550px) {\n  #text-1372881292 {\n    font-size: 1.1rem;\n    line-height: 2;\n  }\n}\n<\/style>\n\t<\/div>\n\t\n\t<div id=\"gap-305379926\" class=\"gap-element clearfix\" style=\"display:block; height:auto;\">\n\t\t\n<style>\n#gap-305379926 {\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-1290152544\">\n\n\t<div id=\"col-102285608\" 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-3042525975\" class=\"text\">\n\t\t\n<h2><strong><b>4. <\/b><\/strong><b><\/b><strong>Sintesi<\/strong><\/h2>\n\t\t\n<style>\n#text-3042525975 {\n  font-size: 0.75rem;\n  line-height: 1.5;\n  color: rgb(255,255,255);\n}\n#text-3042525975 > * {\n  color: rgb(255,255,255);\n}\n@media (min-width:550px) {\n  #text-3042525975 {\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-102285608 > .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-1803269087\">\n\n\t<div id=\"col-1571884087\" 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-109953303\" class=\"text\">\n\t\t\n<p>In sintesi, le quattro unit\u00e0 ottiche - lumen, lux, nit e candela - descrivono le propriet\u00e0 della luce da prospettive distinte e costituiscono, nel loro insieme, i parametri essenziali con cui comprendiamo e misuriamo l'illuminazione.<\/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-109953303 {\n  font-size: 0.75rem;\n  line-height: 1.5;\n}\n@media (min-width:550px) {\n  #text-109953303 {\n    font-size: 1.1rem;\n    line-height: 2;\n  }\n}\n<\/style>\n\t<\/div>\n\t\n\t<div id=\"gap-1569431308\" class=\"gap-element clearfix\" style=\"display:block; height:auto;\">\n\t\t\n<style>\n#gap-1569431308 {\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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