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[o]" accesskey="o" class=""><span>Logg inn</span></a> </li> </ul> </div> </div> </div> <div id="vector-user-links-dropdown" class="vector-dropdown vector-user-menu vector-button-flush-right vector-user-menu-logged-out" title="Fleire val" > <input type="checkbox" id="vector-user-links-dropdown-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-user-links-dropdown" class="vector-dropdown-checkbox " aria-label="Personlege verktøy" > <label id="vector-user-links-dropdown-label" for="vector-user-links-dropdown-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only " aria-hidden="true" ><span class="vector-icon mw-ui-icon-ellipsis mw-ui-icon-wikimedia-ellipsis"></span> <span class="vector-dropdown-label-text">Personlege verktøy</span> </label> <div class="vector-dropdown-content"> <div id="p-personal" class="vector-menu mw-portlet mw-portlet-personal user-links-collapsible-item" title="Brukarmeny" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="pt-sitesupport" class="user-links-collapsible-item mw-list-item"><a href="//donate.wikimedia.org/wiki/Special:FundraiserRedirector?utm_source=donate&utm_medium=sidebar&utm_campaign=C13_nn.wikipedia.org&uselang=nn"><span>Gåver</span></a></li><li id="pt-createaccount" class="user-links-collapsible-item mw-list-item"><a href="/w/index.php?title=Spesial:Opprett_konto&returnto=Luminans" title="Me oppfordrar til at du oppretter ein konto og loggar inn, men det er ikkje påkravd."><span class="vector-icon mw-ui-icon-userAdd mw-ui-icon-wikimedia-userAdd"></span> <span>Opprett konto</span></a></li><li id="pt-login" class="user-links-collapsible-item mw-list-item"><a href="/w/index.php?title=Spesial:Logg_inn&returnto=Luminans" title="Det er ikkje obligatorisk å logga inn, men medfører mange fordelar. [o]" accesskey="o"><span class="vector-icon mw-ui-icon-logIn mw-ui-icon-wikimedia-logIn"></span> <span>Logg inn</span></a></li> </ul> </div> </div> <div id="p-user-menu-anon-editor" class="vector-menu mw-portlet mw-portlet-user-menu-anon-editor" > <div class="vector-menu-heading"> Sider for utlogga bidragsytarar <a href="/wiki/Hjelp:Introduksjon" aria-label="Lær meir om redigering"><span>lær meir</span></a> </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="pt-anoncontribs" class="mw-list-item"><a href="/wiki/Spesial:Bidraga_mine" title="Liste over endringar gjorde frå denne IP-adressa [y]" accesskey="y"><span>Bidrag</span></a></li><li id="pt-anontalk" class="mw-list-item"><a href="/wiki/Spesial:Diskusjonssida_mi" title="Diskusjon om endringar gjorde av denne ip-adressa [n]" accesskey="n"><span>Diskusjon</span></a></li> </ul> </div> </div> </div> </div> </nav> </div> </header> </div> <div class="mw-page-container"> <div class="mw-page-container-inner"> <div class="vector-sitenotice-container"> <div id="siteNotice"></div> </div> <div class="vector-column-start"> <div class="vector-main-menu-container"> <div id="mw-navigation"> <nav id="mw-panel" class="vector-main-menu-landmark" aria-label="Nettstad"> <div id="vector-main-menu-pinned-container" class="vector-pinned-container"> </div> </nav> </div> </div> <div class="vector-sticky-pinned-container"> <nav id="mw-panel-toc" aria-label="Innhald" data-event-name="ui.sidebar-toc" class="mw-table-of-contents-container vector-toc-landmark"> <div id="vector-toc-pinned-container" class="vector-pinned-container"> <div id="vector-toc" class="vector-toc vector-pinnable-element"> <div class="vector-pinnable-header vector-toc-pinnable-header vector-pinnable-header-pinned" data-feature-name="toc-pinned" data-pinnable-element-id="vector-toc" > <h2 class="vector-pinnable-header-label">Innhald</h2> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-toc.pin">flytt til sidefeltet</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-toc.unpin">gøym</button> </div> <ul class="vector-toc-contents" id="mw-panel-toc-list"> <li id="toc-mw-content-text" class="vector-toc-list-item vector-toc-level-1"> <a href="#" class="vector-toc-link"> <div class="vector-toc-text">Byrjinga</div> </a> </li> <li id="toc-Definisjon" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Definisjon"> <div class="vector-toc-text"> <span class="vector-toc-numb">1</span> <span>Definisjon</span> </div> </a> <ul id="toc-Definisjon-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Einingar" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Einingar"> <div class="vector-toc-text"> <span class="vector-toc-numb">2</span> <span>Einingar</span> </div> </a> <ul id="toc-Einingar-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Luminans_i_fjernsyn" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Luminans_i_fjernsyn"> <div class="vector-toc-text"> <span class="vector-toc-numb">3</span> <span>Luminans i fjernsyn</span> </div> </a> <ul id="toc-Luminans_i_fjernsyn-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Sjå_òg" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Sjå_òg"> <div class="vector-toc-text"> <span class="vector-toc-numb">4</span> <span>Sjå òg</span> </div> </a> <ul id="toc-Sjå_òg-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Kjelder" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Kjelder"> <div class="vector-toc-text"> <span class="vector-toc-numb">5</span> <span>Kjelder</span> </div> </a> <ul id="toc-Kjelder-sublist" class="vector-toc-list"> </ul> </li> </ul> </div> </div> </nav> </div> </div> <div class="mw-content-container"> <main id="content" class="mw-body"> <header class="mw-body-header vector-page-titlebar"> <nav aria-label="Innhald" class="vector-toc-landmark"> <div id="vector-page-titlebar-toc" class="vector-dropdown vector-page-titlebar-toc vector-button-flush-left" > <input type="checkbox" id="vector-page-titlebar-toc-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-page-titlebar-toc" class="vector-dropdown-checkbox " aria-label="Vis/skjul innhaldslista" > <label id="vector-page-titlebar-toc-label" for="vector-page-titlebar-toc-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only " aria-hidden="true" ><span class="vector-icon mw-ui-icon-listBullet mw-ui-icon-wikimedia-listBullet"></span> <span class="vector-dropdown-label-text">Vis/skjul innhaldslista</span> </label> <div class="vector-dropdown-content"> <div id="vector-page-titlebar-toc-unpinned-container" class="vector-unpinned-container"> </div> </div> </div> </nav> <h1 id="firstHeading" class="firstHeading mw-first-heading"><span class="mw-page-title-main">Luminans</span></h1> <div id="p-lang-btn" class="vector-dropdown mw-portlet mw-portlet-lang" > <input type="checkbox" id="p-lang-btn-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-p-lang-btn" class="vector-dropdown-checkbox mw-interlanguage-selector" aria-label="Gå til ein artikkel på eit anna språk. Tilgjengeleg på 42 språk" > <label id="p-lang-btn-label" for="p-lang-btn-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--action-progressive mw-portlet-lang-heading-42" aria-hidden="true" ><span class="vector-icon mw-ui-icon-language-progressive mw-ui-icon-wikimedia-language-progressive"></span> <span class="vector-dropdown-label-text">42 språk</span> </label> <div class="vector-dropdown-content"> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="interlanguage-link interwiki-no mw-list-item"><a href="https://no.wikipedia.org/wiki/Luminans" title="Luminans – norsk bokmål" lang="nb" hreflang="nb" data-title="Luminans" data-language-autonym="Norsk bokmål" data-language-local-name="norsk bokmål" class="interlanguage-link-target"><span>Norsk bokmål</span></a></li><li class="interlanguage-link interwiki-sv mw-list-item"><a href="https://sv.wikipedia.org/wiki/Luminans" title="Luminans – svensk" lang="sv" hreflang="sv" data-title="Luminans" data-language-autonym="Svenska" data-language-local-name="svensk" class="interlanguage-link-target"><span>Svenska</span></a></li><li class="interlanguage-link interwiki-af mw-list-item"><a href="https://af.wikipedia.org/wiki/Luminansie" title="Luminansie – afrikaans" lang="af" hreflang="af" data-title="Luminansie" data-language-autonym="Afrikaans" data-language-local-name="afrikaans" class="interlanguage-link-target"><span>Afrikaans</span></a></li><li class="interlanguage-link interwiki-ar mw-list-item"><a href="https://ar.wikipedia.org/wiki/%D8%A7%D8%B3%D8%AA%D8%B6%D9%88%D8%A7%D8%A1" title="استضواء – arabisk" lang="ar" hreflang="ar" data-title="استضواء" data-language-autonym="العربية" data-language-local-name="arabisk" class="interlanguage-link-target"><span>العربية</span></a></li><li class="interlanguage-link interwiki-be mw-list-item"><a href="https://be.wikipedia.org/wiki/%D0%AF%D1%80%D0%BA%D0%B0%D1%81%D1%86%D1%8C" title="Яркасць – belarusisk" lang="be" hreflang="be" data-title="Яркасць" data-language-autonym="Беларуская" data-language-local-name="belarusisk" class="interlanguage-link-target"><span>Беларуская</span></a></li><li class="interlanguage-link interwiki-be-x-old mw-list-item"><a href="https://be-tarask.wikipedia.org/wiki/%D0%AF%D1%80%D0%BA%D0%B0%D1%81%D1%8C%D1%86%D1%8C" title="Яркасьць – belarusisk (klassisk ortografi)" lang="be-tarask" hreflang="be-tarask" data-title="Яркасьць" data-language-autonym="Беларуская (тарашкевіца)" data-language-local-name="belarusisk (klassisk ortografi)" class="interlanguage-link-target"><span>Беларуская (тарашкевіца)</span></a></li><li class="interlanguage-link interwiki-bar mw-list-item"><a href="https://bar.wikipedia.org/wiki/Leichtdichtn" title="Leichtdichtn – bairisk" lang="bar" hreflang="bar" data-title="Leichtdichtn" data-language-autonym="Boarisch" data-language-local-name="bairisk" class="interlanguage-link-target"><span>Boarisch</span></a></li><li class="interlanguage-link interwiki-ca mw-list-item"><a href="https://ca.wikipedia.org/wiki/Lumin%C3%A0ncia" title="Luminància – katalansk" lang="ca" hreflang="ca" data-title="Luminància" data-language-autonym="Català" data-language-local-name="katalansk" class="interlanguage-link-target"><span>Català</span></a></li><li class="interlanguage-link interwiki-cv mw-list-item"><a href="https://cv.wikipedia.org/wiki/%D0%AF%D0%BB%D1%82%C4%83%D1%80%D0%B0%D0%B2" title="Ялтăрав – tsjuvansk" lang="cv" hreflang="cv" data-title="Ялтăрав" data-language-autonym="Чӑвашла" data-language-local-name="tsjuvansk" class="interlanguage-link-target"><span>Чӑвашла</span></a></li><li class="interlanguage-link interwiki-cs mw-list-item"><a href="https://cs.wikipedia.org/wiki/Jas" title="Jas – tsjekkisk" lang="cs" hreflang="cs" data-title="Jas" data-language-autonym="Čeština" data-language-local-name="tsjekkisk" class="interlanguage-link-target"><span>Čeština</span></a></li><li class="interlanguage-link interwiki-de mw-list-item"><a href="https://de.wikipedia.org/wiki/Leuchtdichte" title="Leuchtdichte – tysk" lang="de" hreflang="de" data-title="Leuchtdichte" data-language-autonym="Deutsch" data-language-local-name="tysk" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-et mw-list-item"><a href="https://et.wikipedia.org/wiki/Heledus" title="Heledus – estisk" lang="et" hreflang="et" data-title="Heledus" data-language-autonym="Eesti" data-language-local-name="estisk" class="interlanguage-link-target"><span>Eesti</span></a></li><li class="interlanguage-link interwiki-el mw-list-item"><a href="https://el.wikipedia.org/wiki/%CE%9B%CE%B1%CE%BC%CF%80%CF%81%CF%8C%CF%84%CE%B7%CF%84%CE%B1" title="Λαμπρότητα – gresk" lang="el" hreflang="el" data-title="Λαμπρότητα" data-language-autonym="Ελληνικά" data-language-local-name="gresk" class="interlanguage-link-target"><span>Ελληνικά</span></a></li><li class="interlanguage-link interwiki-en mw-list-item"><a href="https://en.wikipedia.org/wiki/Luminance" title="Luminance – engelsk" lang="en" hreflang="en" data-title="Luminance" data-language-autonym="English" data-language-local-name="engelsk" class="interlanguage-link-target"><span>English</span></a></li><li class="interlanguage-link interwiki-es mw-list-item"><a href="https://es.wikipedia.org/wiki/Luminancia" title="Luminancia – spansk" lang="es" hreflang="es" data-title="Luminancia" data-language-autonym="Español" data-language-local-name="spansk" class="interlanguage-link-target"><span>Español</span></a></li><li class="interlanguage-link interwiki-eu mw-list-item"><a href="https://eu.wikipedia.org/wiki/Luminantzia" title="Luminantzia – baskisk" lang="eu" hreflang="eu" data-title="Luminantzia" data-language-autonym="Euskara" data-language-local-name="baskisk" class="interlanguage-link-target"><span>Euskara</span></a></li><li class="interlanguage-link interwiki-fa mw-list-item"><a href="https://fa.wikipedia.org/wiki/%D9%86%D9%88%D8%B1%D8%AA%D8%A7%D8%A8%DB%8C" title="نورتابی – persisk" lang="fa" hreflang="fa" data-title="نورتابی" data-language-autonym="فارسی" data-language-local-name="persisk" class="interlanguage-link-target"><span>فارسی</span></a></li><li class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/Luminance" title="Luminance – fransk" lang="fr" hreflang="fr" data-title="Luminance" data-language-autonym="Français" data-language-local-name="fransk" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-ko mw-list-item"><a href="https://ko.wikipedia.org/wiki/%ED%9C%98%EB%8F%84" title="휘도 – koreansk" lang="ko" hreflang="ko" data-title="휘도" data-language-autonym="한국어" data-language-local-name="koreansk" class="interlanguage-link-target"><span>한국어</span></a></li><li class="interlanguage-link interwiki-hy mw-list-item"><a href="https://hy.wikipedia.org/wiki/%D5%8A%D5%A1%D5%B5%D5%AE%D5%A1%D5%BC%D5%B8%D6%82%D5%A9%D5%B5%D5%B8%D6%82%D5%B6" title="Պայծառություն – armensk" lang="hy" hreflang="hy" data-title="Պայծառություն" data-language-autonym="Հայերեն" data-language-local-name="armensk" class="interlanguage-link-target"><span>Հայերեն</span></a></li><li class="interlanguage-link interwiki-hr mw-list-item"><a href="https://hr.wikipedia.org/wiki/Svjetljivost" title="Svjetljivost – kroatisk" lang="hr" hreflang="hr" data-title="Svjetljivost" data-language-autonym="Hrvatski" data-language-local-name="kroatisk" class="interlanguage-link-target"><span>Hrvatski</span></a></li><li class="interlanguage-link interwiki-id mw-list-item"><a href="https://id.wikipedia.org/wiki/Luminansi" title="Luminansi – indonesisk" lang="id" hreflang="id" data-title="Luminansi" data-language-autonym="Bahasa Indonesia" data-language-local-name="indonesisk" class="interlanguage-link-target"><span>Bahasa Indonesia</span></a></li><li class="interlanguage-link interwiki-it mw-list-item"><a href="https://it.wikipedia.org/wiki/Luminanza_(fisica)" title="Luminanza (fisica) – italiensk" lang="it" hreflang="it" data-title="Luminanza (fisica)" data-language-autonym="Italiano" data-language-local-name="italiensk" class="interlanguage-link-target"><span>Italiano</span></a></li><li class="interlanguage-link interwiki-kk mw-list-item"><a href="https://kk.wikipedia.org/wiki/%D0%96%D0%B0%D1%80%D1%8B%D2%9B%D1%82%D1%8B%D2%9B" title="Жарықтық – kasakhisk" lang="kk" hreflang="kk" data-title="Жарықтық" data-language-autonym="Қазақша" data-language-local-name="kasakhisk" class="interlanguage-link-target"><span>Қазақша</span></a></li><li class="interlanguage-link interwiki-lt mw-list-item"><a href="https://lt.wikipedia.org/wiki/Skaistis_(fizikinis_dydis)" title="Skaistis (fizikinis dydis) – litauisk" lang="lt" hreflang="lt" data-title="Skaistis (fizikinis dydis)" data-language-autonym="Lietuvių" data-language-local-name="litauisk" class="interlanguage-link-target"><span>Lietuvių</span></a></li><li class="interlanguage-link interwiki-hu mw-list-item"><a href="https://hu.wikipedia.org/wiki/F%C3%A9nys%C5%B1r%C5%B1s%C3%A9g" title="Fénysűrűség – ungarsk" lang="hu" hreflang="hu" data-title="Fénysűrűség" data-language-autonym="Magyar" data-language-local-name="ungarsk" class="interlanguage-link-target"><span>Magyar</span></a></li><li class="interlanguage-link interwiki-mk mw-list-item"><a href="https://mk.wikipedia.org/wiki/%D0%91%D0%BB%D0%B5%D1%81%D0%BA%D0%B0%D0%B2%D0%BE%D1%81%D1%82" title="Блескавост – makedonsk" lang="mk" hreflang="mk" data-title="Блескавост" data-language-autonym="Македонски" data-language-local-name="makedonsk" class="interlanguage-link-target"><span>Македонски</span></a></li><li class="interlanguage-link interwiki-ml mw-list-item"><a href="https://ml.wikipedia.org/wiki/%E0%B4%B2%E0%B5%82%E0%B4%AE%E0%B4%BF%E0%B4%A8%E0%B5%BB%E0%B4%B8%E0%B5%8D" title="ലൂമിനൻസ് – malayalam" lang="ml" hreflang="ml" data-title="ലൂമിനൻസ്" data-language-autonym="മലയാളം" data-language-local-name="malayalam" class="interlanguage-link-target"><span>മലയാളം</span></a></li><li class="interlanguage-link interwiki-nl mw-list-item"><a href="https://nl.wikipedia.org/wiki/Luminantie" title="Luminantie – nederlandsk" lang="nl" hreflang="nl" data-title="Luminantie" data-language-autonym="Nederlands" data-language-local-name="nederlandsk" class="interlanguage-link-target"><span>Nederlands</span></a></li><li class="interlanguage-link interwiki-ja mw-list-item"><a href="https://ja.wikipedia.org/wiki/%E8%BC%9D%E5%BA%A6_(%E5%85%89%E5%AD%A6)" title="輝度 (光学) – japansk" lang="ja" hreflang="ja" data-title="輝度 (光学)" data-language-autonym="日本語" data-language-local-name="japansk" class="interlanguage-link-target"><span>日本語</span></a></li><li class="interlanguage-link interwiki-oc mw-list-item"><a href="https://oc.wikipedia.org/wiki/Lumin%C3%A0ncia" title="Luminància – oksitansk" lang="oc" hreflang="oc" data-title="Luminància" data-language-autonym="Occitan" data-language-local-name="oksitansk" class="interlanguage-link-target"><span>Occitan</span></a></li><li class="interlanguage-link interwiki-pl mw-list-item"><a href="https://pl.wikipedia.org/wiki/Luminancja" title="Luminancja – polsk" lang="pl" hreflang="pl" data-title="Luminancja" data-language-autonym="Polski" data-language-local-name="polsk" class="interlanguage-link-target"><span>Polski</span></a></li><li class="interlanguage-link interwiki-pt mw-list-item"><a href="https://pt.wikipedia.org/wiki/Lumin%C3%A2ncia" title="Luminância – portugisisk" lang="pt" hreflang="pt" data-title="Luminância" data-language-autonym="Português" data-language-local-name="portugisisk" class="interlanguage-link-target"><span>Português</span></a></li><li class="interlanguage-link interwiki-ru mw-list-item"><a href="https://ru.wikipedia.org/wiki/%D0%AF%D1%80%D0%BA%D0%BE%D1%81%D1%82%D1%8C" title="Яркость – russisk" lang="ru" hreflang="ru" data-title="Яркость" data-language-autonym="Русский" data-language-local-name="russisk" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-sk mw-list-item"><a href="https://sk.wikipedia.org/wiki/Jas" title="Jas – slovakisk" lang="sk" hreflang="sk" data-title="Jas" data-language-autonym="Slovenčina" data-language-local-name="slovakisk" class="interlanguage-link-target"><span>Slovenčina</span></a></li><li class="interlanguage-link interwiki-sl mw-list-item"><a href="https://sl.wikipedia.org/wiki/Svetlost" title="Svetlost – slovensk" lang="sl" hreflang="sl" data-title="Svetlost" data-language-autonym="Slovenščina" data-language-local-name="slovensk" class="interlanguage-link-target"><span>Slovenščina</span></a></li><li class="interlanguage-link interwiki-sr mw-list-item"><a href="https://sr.wikipedia.org/wiki/%D0%A1%D1%98%D0%B0%D1%98%D0%BD%D0%BE%D1%81%D1%82_(%D0%BC%D0%B8%D0%BD%D0%B5%D1%80%D0%B0%D0%BB%D0%BE%D0%B3%D0%B8%D1%98%D0%B0)" title="Сјајност (минералогија) – serbisk" lang="sr" hreflang="sr" data-title="Сјајност (минералогија)" data-language-autonym="Српски / srpski" data-language-local-name="serbisk" class="interlanguage-link-target"><span>Српски / srpski</span></a></li><li class="interlanguage-link interwiki-sh mw-list-item"><a href="https://sh.wikipedia.org/wiki/Svjetlo%C4%87a" title="Svjetloća – serbokroatisk" lang="sh" hreflang="sh" data-title="Svjetloća" data-language-autonym="Srpskohrvatski / српскохрватски" data-language-local-name="serbokroatisk" class="interlanguage-link-target"><span>Srpskohrvatski / српскохрватски</span></a></li><li class="interlanguage-link interwiki-fi mw-list-item"><a href="https://fi.wikipedia.org/wiki/Luminanssi" title="Luminanssi – finsk" lang="fi" hreflang="fi" data-title="Luminanssi" data-language-autonym="Suomi" data-language-local-name="finsk" class="interlanguage-link-target"><span>Suomi</span></a></li><li class="interlanguage-link interwiki-th mw-list-item"><a href="https://th.wikipedia.org/wiki/%E0%B8%84%E0%B8%A7%E0%B8%B2%E0%B8%A1%E0%B8%AA%E0%B8%A7%E0%B9%88%E0%B8%B2%E0%B8%87_(%E0%B8%97%E0%B8%B1%E0%B8%A8%E0%B8%99%E0%B8%A8%E0%B8%B2%E0%B8%AA%E0%B8%95%E0%B8%A3%E0%B9%8C)" title="ความสว่าง (ทัศนศาสตร์) – thai" lang="th" hreflang="th" data-title="ความสว่าง (ทัศนศาสตร์)" data-language-autonym="ไทย" data-language-local-name="thai" class="interlanguage-link-target"><span>ไทย</span></a></li><li class="interlanguage-link interwiki-uk mw-list-item"><a href="https://uk.wikipedia.org/wiki/%D0%AF%D1%81%D0%BA%D1%80%D0%B0%D0%B2%D1%96%D1%81%D1%82%D1%8C" title="Яскравість – ukrainsk" lang="uk" hreflang="uk" data-title="Яскравість" data-language-autonym="Українська" data-language-local-name="ukrainsk" class="interlanguage-link-target"><span>Українська</span></a></li><li class="interlanguage-link interwiki-zh mw-list-item"><a href="https://zh.wikipedia.org/wiki/%E4%BA%AE%E5%BA%A6" title="亮度 – kinesisk" lang="zh" hreflang="zh" data-title="亮度" data-language-autonym="中文" data-language-local-name="kinesisk" class="interlanguage-link-target"><span>中文</span></a></li> </ul> <div class="after-portlet after-portlet-lang"><span class="wb-langlinks-edit wb-langlinks-link"><a href="https://www.wikidata.org/wiki/Special:EntityPage/Q355386#sitelinks-wikipedia" title="Endra mellomspråklege lenkjer" class="wbc-editpage">Endra lenkjer</a></span></div> </div> </div> </div> </header> <div class="vector-page-toolbar"> <div class="vector-page-toolbar-container"> <div id="left-navigation"> <nav aria-label="Namnerom"> <div id="p-associated-pages" class="vector-menu vector-menu-tabs mw-portlet mw-portlet-associated-pages" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="ca-nstab-main" class="selected vector-tab-noicon mw-list-item"><a href="/wiki/Luminans" title="Vis innhaldssida [c]" accesskey="c"><span>Artikkel</span></a></li><li id="ca-talk" class="new vector-tab-noicon mw-list-item"><a href="/w/index.php?title=Diskusjon:Luminans&action=edit&redlink=1" rel="discussion" class="new" title="Diskusjon om innhaldssida (sida finst ikkje) [t]" accesskey="t"><span>Diskusjon</span></a></li> </ul> </div> </div> <div id="vector-variants-dropdown" class="vector-dropdown emptyPortlet" > <input type="checkbox" id="vector-variants-dropdown-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-variants-dropdown" class="vector-dropdown-checkbox " aria-label="Endre språkvariant" > <label id="vector-variants-dropdown-label" for="vector-variants-dropdown-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet" aria-hidden="true" ><span class="vector-dropdown-label-text">norsk nynorsk</span> </label> <div class="vector-dropdown-content"> <div id="p-variants" class="vector-menu 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vector-pinnable-element"> <div class="vector-pinnable-header vector-appearance-pinnable-header vector-pinnable-header-pinned" data-feature-name="appearance-pinned" data-pinnable-element-id="vector-appearance" data-pinned-container-id="vector-appearance-pinned-container" data-unpinned-container-id="vector-appearance-unpinned-container" > <div class="vector-pinnable-header-label">Utsjånad</div> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-appearance.pin">flytt til sidefeltet</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-appearance.unpin">gøym</button> </div> </div> </div> </nav> </div> </div> <div id="bodyContent" class="vector-body" aria-labelledby="firstHeading" data-mw-ve-target-container> <div class="vector-body-before-content"> <div class="mw-indicators"> </div> <div id="siteSub" class="noprint">Frå Wikipedia – det frie oppslagsverket</div> </div> <div id="contentSub"><div id="mw-content-subtitle"></div></div> <div id="mw-content-text" class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="nn" dir="ltr"><p><b>Luminans</b> er den <a href="/wiki/Lysstyrke" title="Lysstyrke">lysstyrken</a> som eit lite flateelement av overflata til ei <a href="/wiki/Lys" title="Lys">lyskjelde</a> har når ein ser flateelementet frå ei viss retning, <a href="/wiki/Divisjon_i_matematikk" title="Divisjon i matematikk">dividert</a> med den tilsynelatande storleiken av flateelementet når det vert sett frå den same retninga. For ein lekam som stråler i samsvar med <a href="/wiki/Lamberts_cosinuslov" title="Lamberts cosinuslov">Lamberts cosinuslov</a>, er luminansen den same i alle retningar. </p><p>Luminans vert òg kalla <b>lystettleik</b>. </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Definisjon">Definisjon</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Luminans&veaction=edit&section=1" title="Endre bolk: Definisjon" class="mw-editsection-visualeditor"><span>endre</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Luminans&action=edit&section=1" title="Rediger kildekoden til seksjonen Definisjon"><span>endre wikiteksten</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Luminans er definert<sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> av <a href="/wiki/Derivasjon" title="Derivasjon">derivasjonen</a> </p> <dl><dd><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle L_{\mathrm {v} }={\frac {\mathrm {d} ^{2}\Phi _{\mathrm {v} }}{\mathrm {d} A\,\mathrm {d} {\Omega }\cos \theta }}}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <msub> <mi>L</mi> <mrow class="MJX-TeXAtom-ORD"> <mrow class="MJX-TeXAtom-ORD"> <mi mathvariant="normal">v</mi> </mrow> </mrow> </msub> <mo>=</mo> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mrow> <msup> <mrow class="MJX-TeXAtom-ORD"> <mi mathvariant="normal">d</mi> </mrow> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msup> <msub> <mi mathvariant="normal">Φ</mi> <mrow class="MJX-TeXAtom-ORD"> <mrow class="MJX-TeXAtom-ORD"> <mi mathvariant="normal">v</mi> </mrow> </mrow> </msub> </mrow> <mrow> <mrow class="MJX-TeXAtom-ORD"> <mi mathvariant="normal">d</mi> </mrow> <mi>A</mi> <mspace width="thinmathspace" /> <mrow class="MJX-TeXAtom-ORD"> <mi mathvariant="normal">d</mi> </mrow> <mrow class="MJX-TeXAtom-ORD"> <mi mathvariant="normal">Ω</mi> </mrow> <mi>cos</mi> <mo>⁡</mo> <mi>θ</mi> </mrow> </mfrac> </mrow> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle L_{\mathrm {v} }={\frac {\mathrm {d} ^{2}\Phi _{\mathrm {v} }}{\mathrm {d} A\,\mathrm {d} {\Omega }\cos \theta }}}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/8c03c6f8bb1a8de5d0e7af6bca5ecb9eb81a0acb" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -2.005ex; width:17.987ex; height:5.843ex;" alt="{\displaystyle L_{\mathrm {v} }={\frac {\mathrm {d} ^{2}\Phi _{\mathrm {v} }}{\mathrm {d} A\,\mathrm {d} {\Omega }\cos \theta }}}"></span></dd></dl> <p>der </p> <dl><dd><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle L_{\mathrm {v} }}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <msub> <mi>L</mi> <mrow class="MJX-TeXAtom-ORD"> <mrow class="MJX-TeXAtom-ORD"> <mi mathvariant="normal">v</mi> </mrow> </mrow> </msub> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle L_{\mathrm {v} }}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/3ee8a50295276c3ec248d5eb578ccfac7cc8c752" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.671ex; width:2.683ex; height:2.509ex;" alt="{\displaystyle L_{\mathrm {v} }}"></span> er luminans (<a href="/wiki/Candela" title="Candela">cd</a>/<a href="/wiki/Kvadratmeter" title="Kvadratmeter">m<sup>2</sup></a>),</dd> <dd><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle \Phi _{\mathrm {v} }}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <msub> <mi mathvariant="normal">Φ</mi> <mrow class="MJX-TeXAtom-ORD"> <mrow class="MJX-TeXAtom-ORD"> <mi mathvariant="normal">v</mi> </mrow> </mrow> </msub> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle \Phi _{\mathrm {v} }}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/a5269471e2785865d63663c903334bfc673f4c6b" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.671ex; width:2.778ex; height:2.509ex;" alt="{\displaystyle \Phi _{\mathrm {v} }}"></span> er <a href="/wiki/Lysstraum" title="Lysstraum">lysstraum</a> eller lysfluks (<a href="/wiki/Lumen" title="Lumen">lm</a>),</dd> <dd><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle \theta \,}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>θ</mi> <mspace width="thinmathspace" /> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle \theta \,}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/228647b7d4a18b6c8c0c390b439a61da8fafec76" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.338ex; width:1.478ex; height:2.176ex;" alt="{\displaystyle \theta \,}"></span> er <a href="/wiki/Vinkel" title="Vinkel">vinkelen</a> mellom <a href="/w/index.php?title=Flatenormal&action=edit&redlink=1" class="new" title="Flatenormal (sida finst ikkje)">flatenormalen</a> og den spesifiserte retninga</dd> <dd><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle A}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>A</mi> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle A}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/7daff47fa58cdfd29dc333def748ff5fa4c923e3" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.338ex; width:1.743ex; height:2.176ex;" alt="{\displaystyle A}"></span> er <a href="/wiki/Areal" class="mw-redirect" title="Areal">arealet</a> til flata (<a href="/wiki/Kvadratmeter" title="Kvadratmeter">m<sup>2</sup></a>), og</dd> <dd><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle \Omega \,}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi mathvariant="normal">Ω</mi> <mspace width="thinmathspace" /> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle \Omega \,}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/771ad27abf999ca4ae152aeb523d93eca2447b7e" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.338ex; width:2.065ex; height:2.176ex;" alt="{\displaystyle \Omega \,}"></span> er <a href="/wiki/Romvinkel" title="Romvinkel">romvinkelen</a> (<a href="/wiki/Steradian" title="Steradian">sr</a>).</dd></dl> <p>Uttrykket er skriven med <a href="/w/index.php?title=Leibniz-notasjon&action=edit&redlink=1" class="new" title="Leibniz-notasjon (sida finst ikkje)">Leibniz-notasjon</a>. </p> <div class="mw-heading mw-heading2"><h2 id="Einingar">Einingar</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Luminans&veaction=edit&section=2" title="Endre bolk: Einingar" class="mw-editsection-visualeditor"><span>endre</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Luminans&action=edit&section=2" title="Rediger kildekoden til seksjonen Einingar"><span>endre wikiteksten</span></a><span class="mw-editsection-bracket">]</span></span></div> <p><a href="/wiki/SI-eining" class="mw-redirect" title="SI-eining">SI-eininga</a> for luminans er <a href="/wiki/Candela" title="Candela">candela</a>/m² (cd/m²), som òg har vorte kalla <a href="/wiki/Nit" title="Nit">nit</a>. Andre eininga som har vore nytta er <a href="/wiki/Stilb" title="Stilb">stilb</a> (a) = cd/cm², ²apostilb (asb) = 1/π cd/m², <a href="/wiki/Lambert" title="Lambert">lambert</a> = 1/π cd/cm² og <a href="/w/index.php?title=Foot-lambert&action=edit&redlink=1" class="new" title="Foot-lambert (sida finst ikkje)">foot-lambert</a> = 1/π cd/ft² = 3,426 cd/m2. </p> <div class="mw-heading mw-heading2"><h2 id="Luminans_i_fjernsyn">Luminans i fjernsyn</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Luminans&veaction=edit&section=3" title="Endre bolk: Luminans i fjernsyn" class="mw-editsection-visualeditor"><span>endre</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Luminans&action=edit&section=3" title="Rediger kildekoden til seksjonen Luminans i fjernsyn"><span>endre wikiteksten</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Ved ei analog <a href="/w/index.php?title=Fjernsynssending&action=edit&redlink=1" class="new" title="Fjernsynssending (sida finst ikkje)">fjernsynssending</a> vert alle detaljar i fjernsynsbiletet overført ved hjelp av luminanssignalet, som inneheld svart/kvit-informasjonen. Eventuelle fargar vert overført ved hjelp av eit tilleggssignal, krominanssignalet. </p> <div class="mw-heading mw-heading2"><h2 id="Sjå_òg"><span id="Sj.C3.A5_.C3.B2g"></span>Sjå òg</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Luminans&veaction=edit&section=4" title="Endre bolk: Sjå òg" class="mw-editsection-visualeditor"><span>endre</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Luminans&action=edit&section=4" title="Rediger kildekoden til seksjonen Sjå òg"><span>endre wikiteksten</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/wiki/Lysm%C3%A5ling" title="Lysmåling">Lysmåling</a></li> <li><a href="/w/index.php?title=Analoge_fjernsynssystem&action=edit&redlink=1" class="new" title="Analoge fjernsynssystem (sida finst ikkje)">Analoge fjernsynssystem</a></li> <li><a href="/wiki/Fjernsyn" title="Fjernsyn">Fjernsyn</a></li></ul> <div class="mw-heading mw-heading2"><h2 id="Kjelder">Kjelder</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Luminans&veaction=edit&section=5" title="Endre bolk: Kjelder" class="mw-editsection-visualeditor"><span>endre</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Luminans&action=edit&section=5" title="Rediger kildekoden til seksjonen Kjelder"><span>endre wikiteksten</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><cite class="citation"><a rel="nofollow" class="external text" href="http://snl.no/luminans">«luminans»</a>, <i>Store norske leksikon</i>, 28. februar 2013</cite><span title="ctx_ver=Z39.88-2004&rfr_id=info%3Asid%2Fnn.wikipedia.org%3ALuminans&rft.atitle=luminans&rft.chron=28.+februar+2013&rft.genre=article&rft.jtitle=Store+norske+leksikon&rft_id=http%3A%2F%2Fsnl.no%2Fluminans&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal" class="Z3988"><span style="display:none;"> </span></span></li></ul> <style data-mw-deduplicate="TemplateStyles:r3318915">.mw-parser-output .reflist{font-size:90%;margin-bottom:0.5em;list-style-type:decimal}.mw-parser-output .reflist .references{font-size:100%;margin-bottom:0;list-style-type:inherit}.mw-parser-output .reflist-columns-2{column-width:30em}.mw-parser-output .reflist-columns-3{column-width:25em}.mw-parser-output .reflist-columns{margin-top:0.3em}.mw-parser-output .reflist-columns ol{margin-top:0}.mw-parser-output .reflist-columns li{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output .reflist-upper-alpha{list-style-type:upper-alpha}.mw-parser-output .reflist-upper-roman{list-style-type:upper-roman}.mw-parser-output .reflist-lower-alpha{list-style-type:lower-alpha}.mw-parser-output .reflist-lower-greek{list-style-type:lower-greek}.mw-parser-output .reflist-lower-roman{list-style-type:lower-roman}</style><div class="reflist"> <div class="mw-references-wrap"><ol class="references"> <li id="cite_note-1"><span class="mw-cite-backlink"><a href="#cite_ref-1">↑</a></span> <span class="reference-text"><cite class="citation book">Chaves, Julio (2008). <a rel="nofollow" class="external text" href="http://books.google.de/books?id=ykk1xQc25c0C&pg=PA449"><i>Introduction to Nonimaging Optics</i></a>. Optical Science and Engineering <b>134</b>. <a href="/w/index.php?title=CRC_Press&action=edit&redlink=1" class="new" title="CRC Press (sida finst ikkje)">CRC Press</a>. s. 449. <a href="/wiki/International_Standard_Book_Number" class="mw-redirect" title="International Standard Book Number">ISBN</a> <a href="/wiki/Spesial:Bokkjelder/9781420054293" title="Spesial:Bokkjelder/9781420054293">9781420054293</a>.</cite><span title="ctx_ver=Z39.88-2004&rfr_id=info%3Asid%2Fnn.wikipedia.org%3ALuminans&rft.aufirst=Julio&rft.aulast=Chaves&rft.btitle=Introduction+to+Nonimaging+Optics&rft.date=2008&rft.genre=book&rft.isbn=9781420054293&rft.pages=449&rft.pub=CRC+Press&rft.series=Optical+Science+and+Engineering&rft_id=http%3A%2F%2Fbooks.google.de%2Fbooks%3Fid%3Dykk1xQc25c0C%26pg%3DPA449&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook" class="Z3988"><span style="display:none;"> </span></span></span> </li> </ol></div></div>    </div><noscript><img src="https://login.wikimedia.org/wiki/Special:CentralAutoLogin/start?type=1x1" alt="" width="1" height="1" style="border: none; position: absolute;"></noscript> <div class="printfooter" data-nosnippet="">Henta frå «<a dir="ltr" href="https://nn.wikipedia.org/w/index.php?title=Luminans&oldid=3482366">https://nn.wikipedia.org/w/index.php?title=Luminans&oldid=3482366</a>»</div></div> <div id="catlinks" class="catlinks" data-mw="interface"><div id="mw-normal-catlinks" class="mw-normal-catlinks"><a href="/wiki/Kategori:Kategoriar" title="Kategori:Kategoriar">Kategoriar</a>: <ul><li><a href="/wiki/Kategori:Fysiske_storleikar" title="Kategori:Fysiske storleikar">Fysiske storleikar</a></li><li><a href="/wiki/Kategori:Fotometri" title="Kategori:Fotometri">Fotometri</a></li></ul></div></div> </div> </main> </div> <div class="mw-footer-container"> <footer id="footer" class="mw-footer" > <ul id="footer-info"> <li id="footer-info-lastmod"> Denne sida vart sist endra den 8. mai 2023 kl. 18:41.</li> <li id="footer-info-copyright">All tekst er tilgjengeleg under <a rel="nofollow" class="external text" href="http://creativecommons.org/licenses/by-sa/4.0/deed.no">Creative Commons-lisensen Namngjeving/Del på same vilkåra</a>. 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