{"id":26037,"date":"2026-11-10T07:55:44","date_gmt":"2026-11-10T07:55:44","guid":{"rendered":"https:\/\/hlled.com\/?page_id=26037"},"modified":"2026-11-10T08:21:09","modified_gmt":"2026-11-10T08:21:09","slug":"lighting-load-calculator","status":"publish","type":"page","link":"https:\/\/hlled.com\/fr\/lighting-load-calculator\/","title":{"rendered":"Lighting Load &#038; Wattage Calculator"},"content":{"rendered":"\n<style>\n.hlc{max-width:1080px;margin:0 auto;font-family:-apple-system,BlinkMacSystemFont,\"Segoe UI\",Roboto,Helvetica,Arial,sans-serif;color:#1f2328}\n.hlc *{box-sizing:border-box}\n.hlc-hd{margin:0 0 6px}\n.hlc-sub{color:#5b6470;font-size:15px;line-height:1.6;margin:0 0 22px;max-width:760px}\n.hlc-grid{display:grid;grid-template-columns:minmax(0,380px) minmax(0,1fr);gap:18px;align-items:start}\n.hlc-card{background:#fff;border:1px solid #e3e7ec;border-radius:12px;padding:20px}\n.hlc-label{display:block;font-size:12px;font-weight:600;letter-spacing:.04em;text-transform:uppercase;color:#68717d;margin:0 0 6px}\n.hlc-field{margin:0 0 16px}\n.hlc-field:last-child{margin-bottom:0}\n.hlc-tabs{display:flex;gap:6px;margin:0 0 12px}\n.hlc-tab{flex:1;border:1px solid #e3e7ec;background:#f7f8fa;color:#4a5058;border-radius:8px;padding:7px 0;font-size:13px;cursor:pointer;font-family:inherit;transition:.15s}\n.hlc-tab.on{background:#1f2328;border-color:#1f2328;color:#fff;font-weight:600}\n.hlc-row{display:grid;grid-template-columns:1fr 1fr;gap:10px}\n.hlc input[type=number],.hlc select{width:100%;border:1px solid #d6dbe2;border-radius:8px;padding:9px 10px;font-size:14px;color:#1f2328;background:#fff;font-family:inherit;outline:none;transition:.15s}\n.hlc input[type=number]:focus,.hlc select:focus{border-color:#ff485f;box-shadow:0 0 0 3px rgba(255,72,95,.12)}\n.hlc-unit{position:relative}\n.hlc-unit span{position:absolute;right:11px;top:50%;transform:translateY(-50%);font-size:12px;color:#8b939e;pointer-events:none}\n.hlc-unit input[type=number]{padding-right:34px}\n.hlc-hint{font-size:12px;color:#7b848f;line-height:1.5;margin:6px 0 0}\n.hlc-adv{margin-top:4px;border-top:1px dashed #e3e7ec;padding-top:12px}\n.hlc-adv summary{cursor:pointer;font-size:12.5px;color:#2b6cb0;font-weight:600;list-style:none}\n.hlc-adv summary::-webkit-details-marker{display:none}\n.hlc-adv[open] summary{margin-bottom:12px}\n.hlc-kpis{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin:0 0 16px}\n.hlc-kpi{background:#f7f8fa;border-radius:10px;padding:12px 14px}\n.hlc-kpi span{display:block;font-size:11px;letter-spacing:.05em;text-transform:uppercase;color:#78818d;margin:0 0 4px}\n.hlc-kpi b{font-size:24px;font-weight:650;letter-spacing:-.02em;line-height:1.1;color:#12161d}\n.hlc-kpi b i{font-size:12px;font-style:normal;font-weight:500;color:#78818d;margin-left:2px}\n.hlc-rows{margin:0 0 12px}\n.hlc-rows div{display:flex;justify-content:space-between;gap:14px;padding:8px 0;border-bottom:1px solid #eef1f4;font-size:13.5px}\n.hlc-rows div:last-child{border-bottom:none}\n.hlc-rows dt{color:#68717d;margin:0}\n.hlc-rows dd{margin:0;font-weight:600;text-align:right;color:#1f2328}\n.hlc-family{font-size:12.5px;color:#4a5058;line-height:1.55;margin:0 0 6px;padding:8px 0 0;border-top:1px solid #eef1f4}\n.hlc-foot{font-size:12px;color:#8b939e;line-height:1.55;margin:10px 0 0}\n.hlc-warn{background:#fff6e8;border-left:3px solid #e8a33d;border-radius:0 8px 8px 0;padding:10px 13px;font-size:13px;line-height:1.55;color:#6b4a12;margin:0 0 10px}\n.hlc-warn.soft{background:#eef4fb;border-left-color:#2b6cb0;color:#274b6e}\n.hlc-empty{color:#8b939e;font-size:14px;margin:0}\n.hlc-note{font-size:13px;color:#5b6470;line-height:1.7;margin:0}\n.hlc-assume{width:100%;border-collapse:collapse;font-size:13.5px;margin:0 0 4px}\n.hlc-assume td{padding:8px 0;border-bottom:1px solid #eef1f4;vertical-align:top}\n.hlc-assume td:first-child{color:#68717d;white-space:nowrap;padding-right:16px;width:34%}\n.entry-hero .page-title,.entry-hero h1{font-size:clamp(28px,3.2vw,40px);line-height:1.15}\n.entry-hero{padding-top:30px;padding-bottom:28px}\n.hlc-cta{margin:26px 0 0;background:#151a22;border-radius:12px;padding:26px 28px;display:flex;align-items:center;gap:26px;justify-content:space-between;flex-wrap:wrap}\n.hlc-cta h3{color:#fff;font-size:19px;margin:0 0 6px;font-weight:600;line-height:1.35}\n.hlc-cta p{color:#a9b2be;font-size:13.5px;line-height:1.6;margin:0;max-width:560px}\n.hlc-cta a{flex:0 0 auto;background:#ff485f;color:#fff;text-decoration:none;font-weight:600;font-size:14.5px;padding:12px 24px;border-radius:8px;white-space:nowrap}\n.hlc-cta a:hover{background:#ff5d72}\n@media (max-width:860px){.hlc-grid{grid-template-columns:minmax(0,1fr)}.hlc-kpis{grid-template-columns:1fr 1fr}.hlc-cta{padding:22px 20px}.hlc-cta a{width:100%;text-align:center}}\n@media (max-width:460px){.hlc-kpis{grid-template-columns:1fr}}\n<\/style>\n<p class=\"hlc-sub\">Work out the connected load and the number of luminaires a space needs before you draw anything. Enter the room, pick the application, and the calculator returns the luminous flux required, the module count and the resulting power density.<\/p>\n<div class=\"hlc\">\n  <div class=\"hlc-grid\">\n    <div class=\"hlc-card\">\n      <div class=\"hlc-field\">\n        <span class=\"hlc-label\">Room size<\/span>\n        <div class=\"hlc-tabs\"><button type=\"button\" class=\"hlc-tab on\" id=\"hlcTabDims\">Length \u00d7 width<\/button><button type=\"button\" class=\"hlc-tab\" id=\"hlcTabArea\">Total area<\/button><\/div>\n        <div id=\"hlcDims\"><div class=\"hlc-row\">\n          <div class=\"hlc-unit\"><input type=\"number\" id=\"hlcLen\" min=\"0\" step=\"0.1\" placeholder=\"Length\"><span>m<\/span><\/div>\n          <div class=\"hlc-unit\"><input type=\"number\" id=\"hlcWid\" min=\"0\" step=\"0.1\" placeholder=\"Width\"><span>m<\/span><\/div>\n        <\/div><\/div>\n        <div id=\"hlcAreaWrap\" style=\"display:none\"><div class=\"hlc-unit\"><input type=\"number\" id=\"hlcArea\" min=\"0\" step=\"1\" placeholder=\"Floor area\"><span>m&sup2;<\/span><\/div><\/div>\n      <\/div>\n      <div class=\"hlc-field\">\n        <label class=\"hlc-label\" for=\"hlcApp\">Application<\/label>\n        <select id=\"hlcApp\">\n          <option value=\"office\">Office \/ open plan \u2014 400 lx<\/option>\n          <option value=\"meeting\">Meeting room \u2014 500 lx<\/option>\n          <option value=\"classroom\">Classroom \/ training \u2014 400 lx<\/option>\n          <option value=\"retail\">Retail floor \u2014 500 lx<\/option>\n          <option value=\"showroom\">Showroom \/ gallery \u2014 400 lx<\/option>\n          <option value=\"hospitality\">Restaurant \/ hotel \u2014 200 lx<\/option>\n          <option value=\"lobby\">Lobby \/ reception \u2014 300 lx<\/option>\n          <option value=\"industrial\">Industrial \/ warehouse \u2014 200 lx<\/option>\n          <option value=\"supermarket\">Supermarket \u2014 500 lx<\/option>\n          <option value=\"residential\">Residential \u2014 150 lx<\/option>\n          <option value=\"custom\">Custom target\u2026<\/option>\n        <\/select>\n        <div id=\"hlcLuxWrap\" style=\"display:none;margin-top:10px\"><div class=\"hlc-unit\"><input type=\"number\" id=\"hlcLux\" min=\"20\" max=\"2000\" step=\"10\" value=\"300\" placeholder=\"Target illuminance\"><span>lx<\/span><\/div><\/div>\n        <p class=\"hlc-hint\">Targets follow common maintained-illuminance ranges for each space type, not a code minimum.<\/p>\n      <\/div>\n      <div class=\"hlc-field\">\n        <label class=\"hlc-label\" for=\"hlcUnit\">Luminaire<\/label>\n        <select id=\"hlcUnit\">\n          <option value=\"m40\">40 W module \u2014 5,650 lm<\/option>\n          <option value=\"m60\">60 W module \u2014 5,450 lm<\/option>\n          <option value=\"m80\">80 W module \u2014 11,200 lm<\/option>\n          <option value=\"custom\">Other luminaire\u2026<\/option>\n        <\/select>\n        <div id=\"hlcUnitWrap\" style=\"display:none;margin-top:10px\"><div class=\"hlc-row\">\n          <div class=\"hlc-unit\"><input type=\"number\" id=\"hlcUnitW\" min=\"1\" step=\"1\" value=\"40\" placeholder=\"W\"><span>W<\/span><\/div>\n          <div class=\"hlc-unit\"><input type=\"number\" id=\"hlcUnitLm\" min=\"100\" step=\"50\" value=\"5600\" placeholder=\"lm\"><span>lm<\/span><\/div>\n        <\/div><\/div>\n      <\/div>\n      <details class=\"hlc-adv\">\n        <summary>Calculation assumptions<\/summary>\n        <div class=\"hlc-row\">\n          <div><label class=\"hlc-label\" for=\"hlcCu\">Utilisation factor<\/label><input type=\"number\" id=\"hlcCu\" min=\"0.2\" max=\"0.95\" step=\"0.05\" value=\"0.60\"><\/div>\n          <div><label class=\"hlc-label\" for=\"hlcMf\">Maintenance factor<\/label><input type=\"number\" id=\"hlcMf\" min=\"0.4\" max=\"1\" step=\"0.05\" value=\"0.80\"><\/div>\n        <\/div>\n        <p class=\"hlc-hint\">0.60 \/ 0.80 suit a suspended direct\/indirect system in a clean interior at 2.7&ndash;3.0 m mounting height. Lower the utilisation factor for very high ceilings.<\/p>\n      <\/details>\n    <\/div>\n    <div class=\"hlc-card\">\n      <span class=\"hlc-label\">Result<\/span>\n      <div id=\"hlcOut\"><p class=\"hlc-empty\">Enter the room size to see the result.<\/p><\/div>\n    <\/div>\n  <\/div>\n  <div class=\"hlc-card\" style=\"margin-top:18px\">\n    <span class=\"hlc-label\">How the estimate is built<\/span>\n    <table class=\"hlc-assume\">\n      <tr><td>Luminous flux required<\/td><td>(target lux \u00d7 floor area) \u00f7 (utilisation factor \u00d7 maintenance factor)<\/td><\/tr>\n      <tr><td>Module count<\/td><td>Required flux \u00f7 flux per module, rounded up to the next whole fixture<\/td><\/tr>\n      <tr><td>Connected load<\/td><td>Module count \u00d7 rated wattage per module<\/td><\/tr>\n      <tr><td>Module flux<\/td><td>Measured values from our own IES files: 5,650 lm at 40 W, 5,450 lm at 60 W, 11,200 lm at 80 W<\/td><\/tr>\n    <\/table>\n    <p class=\"hlc-foot\">This is a load and quantity estimate, not a photometric calculation. Uniformity, glare and wall-washing need a point-by-point run against the actual layout &mdash; that is what the planner does.<\/p>\n  <\/div>\n  <div class=\"hlc-cta\">\n    <div><h3>Need the actual layout, not just the load?<\/h3><p>Enter the room in the planner and it returns buildable modular geometries with a luminaire schedule, connected load, weight and IES-based illuminance &mdash; then exports as a drawing and a parts list.<\/p><\/div>\n    <a href=\"\/modular-lighting-planner\/\" target=\"_blank\">Open the planner &#8594;<\/a>\n  <\/div>\n<\/div>\n<script type=\"text\/plain\" 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Enter the room, pick the application, and the calculator returns the luminous flux required, the module count and the resulting power density. Room size Length \u00d7 widthTotal area m m m&sup2; Application Office \/ open plan \u2014 400&#8230;<\/p>","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"_kb_optimizer_status":2,"_kad_blocks_custom_css":"","_kad_blocks_head_custom_js":"","_kad_blocks_body_custom_js":"","_kad_blocks_footer_custom_js":"","_kadence_starter_templates_imported_post":false,"_kad_post_transparent":"disable","_kad_post_title":"show","_kad_post_layout":"normal","_kad_post_sidebar_id":"","_kad_post_content_style":"unboxed","_kad_post_vertical_padding":"hide","_kad_post_feature":"hide","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"_kad_post_classname":"","footnotes":""},"class_list":["post-26037","page","type-page","status-publish","hentry"],"acf":[],"taxonomy_info":[],"featured_image_src_large":false,"author_info":{"display_name":"Helian LED Lighting","author_link":"https:\/\/hlled.com\/fr\/author\/helian-led-lighting\/"},"comment_info":0,"_links":{"self":[{"href":"https:\/\/hlled.com\/fr\/wp-json\/wp\/v2\/pages\/26037","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/hlled.com\/fr\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/hlled.com\/fr\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/hlled.com\/fr\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/hlled.com\/fr\/wp-json\/wp\/v2\/comments?post=26037"}],"version-history":[{"count":4,"href":"https:\/\/hlled.com\/fr\/wp-json\/wp\/v2\/pages\/26037\/revisions"}],"predecessor-version":[{"id":26051,"href":"https:\/\/hlled.com\/fr\/wp-json\/wp\/v2\/pages\/26037\/revisions\/26051"}],"wp:attachment":[{"href":"https:\/\/hlled.com\/fr\/wp-json\/wp\/v2\/media?parent=26037"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}