{"id":15446,"date":"2026-10-20T05:27:09","date_gmt":"2026-10-20T05:27:09","guid":{"rendered":"https:\/\/hondellighting.com\/?page_id=15446"},"modified":"2026-10-20T06:42:47","modified_gmt":"2026-10-20T06:42:47","slug":"linear-light-voltage-drop-calculation","status":"publish","type":"page","link":"https:\/\/hondellighting.com\/ar\/linear-light-voltage-drop-calculation.html","title":{"rendered":"Elementor #15446"},"content":{"rendered":"<div data-elementor-type=\"wp-page\" data-elementor-id=\"15446\" class=\"elementor elementor-15446\">\n\t\t\t\t<div class=\"elementor-element elementor-element-77f08ba e-flex e-con-boxed e-con e-parent\" data-id=\"77f08ba\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-b828d25 elementor-widget elementor-widget-html\" data-id=\"b828d25\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<style>\r\n    :root {\r\n        --primary: #0ea5e9;\r\n        --primary-hover: #38bdf8;\r\n        --danger: #ef4444;\r\n        --success: #10b981;\r\n        --warning: #f59e0b;\r\n        --bg-dark: #070d1e;\r\n        --card-bg: #0f1c3f;\r\n        --card-border: #1e295d;\r\n        --text-main: #f8fafc;\r\n        --text-muted: #94a3b8;\r\n    }\r\n\r\n    .vdrop-calculator-container {\r\n        font-family: -apple-system, BlinkMacSystemFont, \"Segoe UI\", Roboto, Helvetica, Arial, sans-serif;\r\n        background-color: var(--bg-dark);\r\n        color: var(--text-main);\r\n        padding: 2rem;\r\n        border-radius: 14px;\r\n        max-width: 850px;\r\n        margin: 0 auto;\r\n        border: 1px solid var(--card-border);\r\n        box-shadow: 0 16px 36px rgba(0, 0, 0, 0.45);\r\n    }\r\n\r\n    .calculator-header {\r\n        text-align: center;\r\n        margin-bottom: 1.5rem;\r\n    }\r\n\r\n    .calculator-header h2 {\r\n        margin: 0 0 0.5rem 0;\r\n        color: var(--primary);\r\n        font-size: 1.6rem;\r\n        letter-spacing: -0.5px;\r\n    }\r\n\r\n    .calculator-header p {\r\n        margin: 0;\r\n        color: var(--text-muted);\r\n        font-size: 0.9rem;\r\n    }\r\n\r\n    .section-label {\r\n        display: block;\r\n        font-size: 0.85rem;\r\n        font-weight: 600;\r\n        text-transform: uppercase;\r\n        letter-spacing: 0.05em;\r\n        color: var(--text-muted);\r\n        margin-bottom: 0.75rem;\r\n        margin-top: 1.5rem;\r\n    }\r\n\r\n    .toggle-grid {\r\n        display: grid;\r\n        grid-template-columns: 1fr 1fr;\r\n        gap: 0.75rem;\r\n    }\r\n\r\n    .toggle-btn {\r\n        background-color: var(--card-bg);\r\n        border: 1px solid var(--card-border);\r\n        color: var(--text-muted);\r\n        padding: 0.85rem;\r\n        border-radius: 8px;\r\n        cursor: pointer;\r\n        text-align: center;\r\n        font-size: 1rem;\r\n        font-weight: 600;\r\n        transition: all 0.2s ease;\r\n    }\r\n\r\n    .toggle-btn:hover {\r\n        border-color: var(--primary-hover);\r\n        color: var(--text-main);\r\n    }\r\n\r\n    .toggle-btn.active {\r\n        background-color: rgba(14, 165, 233, 0.15);\r\n        border-color: var(--primary);\r\n        color: var(--primary);\r\n        box-shadow: 0 0 0 1px var(--primary);\r\n    }\r\n\r\n    .input-grid {\r\n        display: grid;\r\n        grid-template-columns: repeat(2, 1fr);\r\n        gap: 0.85rem;\r\n        margin-top: 1rem;\r\n    }\r\n\r\n    @media (min-width: 600px) {\r\n        .input-grid { grid-template-columns: repeat(3, 1fr); 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}\r\n    \r\n    select.input-field {\r\n        cursor: pointer;\r\n    }\r\n\r\n    .results-grid {\r\n        display: grid;\r\n        grid-template-columns: repeat(2, 1fr);\r\n        gap: 0.85rem;\r\n        margin: 1.5rem 0;\r\n    }\r\n\r\n    @media (min-width: 600px) {\r\n        .results-grid { grid-template-columns: repeat(3, 1fr); }\r\n    }\r\n\r\n    .result-item {\r\n        background: var(--card-bg);\r\n        border: 1px solid var(--card-border);\r\n        padding: 1rem;\r\n        border-radius: 8px;\r\n    }\r\n\r\n    .result-item.highlight-blue {\r\n        background: linear-gradient(135deg, rgba(14, 165, 233, 0.1) 0%, var(--card-bg) 100%);\r\n        border-color: var(--primary);\r\n    }\r\n\r\n    .result-item.highlight-green {\r\n        background: linear-gradient(135deg, rgba(16, 185, 129, 0.1) 0%, var(--card-bg) 100%);\r\n        border-color: var(--success);\r\n    }\r\n    \r\n    .result-item.highlight-warning {\r\n        background: linear-gradient(135deg, rgba(239, 68, 68, 0.1) 0%, var(--card-bg) 100%);\r\n        border-color: var(--danger);\r\n    }\r\n\r\n    .result-name {\r\n        font-size: 0.75rem;\r\n        color: var(--text-muted);\r\n        text-transform: uppercase;\r\n        letter-spacing: 0.05em;\r\n        margin-bottom: 0.35rem;\r\n    }\r\n\r\n    .result-val {\r\n        font-size: 1.4rem;\r\n        font-weight: 700;\r\n        color: #fff;\r\n    }\r\n\r\n    .highlight-blue .result-val { color: var(--primary); font-size: 1.6rem; }\r\n    .highlight-green .result-val { color: var(--success); font-size: 1.6rem; }\r\n    .highlight-warning .result-val { color: var(--danger); font-size: 1.6rem; }\r\n\r\n    .result-unit {\r\n        font-size: 0.85rem;\r\n        font-weight: 400;\r\n        color: var(--text-muted);\r\n        margin-left: 0.25rem;\r\n    }\r\n\r\n    .status-banner {\r\n        padding: 1rem;\r\n        border-radius: 8px;\r\n        text-align: center;\r\n        font-size: 0.9rem;\r\n        font-weight: 600;\r\n        margin-bottom: 0.5rem;\r\n    }\r\n\r\n    .status-pass { background: rgba(16, 185, 129, 0.15); color: var(--success); border: 1px solid rgba(16, 185, 129, 0.3); }\r\n    .status-fail { background: rgba(239, 68, 68, 0.15); color: var(--danger); border: 1px solid rgba(239, 68, 68, 0.3); }\r\n\r\n    .formula-note {\r\n        text-align: center;\r\n        font-size: 0.75rem;\r\n        color: var(--text-muted);\r\n        margin-top: 1rem;\r\n    }\r\n<\/style>\r\n\r\n<div class=\"vdrop-calculator-container\">\r\n    <div class=\"calculator-header\">\r\n        <h2>Advanced Voltage Drop & Load Calculator<\/h2>\r\n        <p>Calculate cable resistance, load capacity, and topology limitations.<\/p>\r\n    <\/div>\r\n\r\n    <span class=\"section-label\">1. Select System Voltage<\/span>\r\n    <div class=\"toggle-grid\">\r\n        <button class=\"toggle-btn sys-btn\" data-sys=\"24\" onclick=\"setSystem(24)\">24V System<\/button>\r\n        <button class=\"toggle-btn sys-btn active\" data-sys=\"48\" onclick=\"setSystem(48)\">48V System<\/button>\r\n    <\/div>\r\n\r\n    <span class=\"section-label\">2. Select Fixture Type<\/span>\r\n    <div class=\"toggle-grid\">\r\n        <button class=\"toggle-btn type-btn active\" data-type=\"rgb\" onclick=\"setType('rgb')\">RGB (13W)<\/button>\r\n        <button class=\"toggle-btn type-btn\" data-type=\"sc\" onclick=\"setType('sc')\">Single Color (10W)<\/button>\r\n    <\/div>\r\n\r\n    <span class=\"section-label\">3. Engineering Parameters<\/span>\r\n    <div class=\"input-grid\">\r\n        <div class=\"input-group full-width\">\r\n            <span class=\"input-label\">Power Feed Topology<\/span>\r\n            <select id=\"input-topology\" class=\"input-field\" onchange=\"calculateDrop()\">\r\n                <option value=\"1.0\" selected>End-Fed (Start of the lights)<\/option>\r\n                <option value=\"0.5\">Center-Fed (Middle of the lights)<\/option>\r\n                <option value=\"0.5\">Dual End-Fed (Power at both ends)<\/option>\r\n            <\/select>\r\n        <\/div>\r\n        \r\n        <div class=\"input-group\">\r\n            <span class=\"input-label\">Driver Power (W)<\/span>\r\n            <select id=\"input-power\" class=\"input-field\" onchange=\"driverChanged()\">\r\n                <!-- Populated dynamically via JS -->\r\n            <\/select>\r\n        <\/div>\r\n\r\n        <div class=\"input-group\">\r\n            <span class=\"input-label\">Main Cable Length (m)<\/span>\r\n            <input type=\"number\" id=\"input-length\" class=\"input-field\" step=\"1\" oninput=\"calculateDrop()\">\r\n        <\/div>\r\n        <div class=\"input-group\">\r\n            <span class=\"input-label\">Main Cable (mm\u00b2)<\/span>\r\n            <select id=\"input-size\" class=\"input-field\" onchange=\"calculateDrop()\">\r\n                <option value=\"1.5\">2 x 1.5<\/option>\r\n                <option value=\"2.5\">2 x 2.5<\/option>\r\n                <option value=\"4.0\" selected>2 x 4.0<\/option>\r\n                <option value=\"6.0\">2 x 6.0<\/option>\r\n                <option value=\"10.0\">2 x 10.0<\/option>\r\n            <\/select>\r\n        <\/div>\r\n        \r\n        <div class=\"input-group\">\r\n            <span class=\"input-label\">Light Spacing (m)<\/span>\r\n            <input type=\"number\" id=\"input-spacing\" class=\"input-field\" value=\"1.0\" step=\"0.5\" oninput=\"calculateDrop()\">\r\n        <\/div>\r\n        <div class=\"input-group\">\r\n            <span class=\"input-label\">Interconnect Cable (mm\u00b2)<\/span>\r\n            <select id=\"input-interconnect\" class=\"input-field\" onchange=\"calculateDrop()\">\r\n                <option value=\"1.0\">2 x 1.0<\/option>\r\n                <option value=\"1.5\">2 x 1.5<\/option>\r\n                <option value=\"2.5\">2 x 2.5<\/option>\r\n            <\/select>\r\n        <\/div>\r\n\r\n        <div class=\"input-group\">\r\n            <span class=\"input-label\">Max Fixtures (PCs)<\/span>\r\n            <input type=\"number\" id=\"input-pcs\" class=\"input-field\" step=\"1\" oninput=\"calculateDrop()\">\r\n        <\/div>\r\n        <div class=\"input-group\">\r\n            <span class=\"input-label\">Fixture Wattage (W)<\/span>\r\n            <input type=\"number\" id=\"input-fixture-watt\" class=\"input-field\" step=\"0.5\" oninput=\"calculateDrop()\">\r\n        <\/div>\r\n        <div class=\"input-group\">\r\n            <span class=\"input-label\">Base Drop Per Light (V)<\/span>\r\n            <input type=\"number\" id=\"input-fixture-drop\" class=\"input-field\" step=\"0.001\" oninput=\"calculateDrop()\">\r\n        <\/div>\r\n    <\/div>\r\n\r\n    <span class=\"section-label\">4. System Output<\/span>\r\n    <div class=\"results-grid\">\r\n        <div class=\"result-item highlight-warning\" id=\"card-load\">\r\n            <div class=\"result-name\">Total Fixture Load<\/div>\r\n            <div class=\"result-val\"><span id=\"res-total-load\">0<\/span><span class=\"result-unit\">\u062f\u0628\u0644\u064a\u0648<\/span><\/div>\r\n        <\/div>\r\n        <div class=\"result-item\" id=\"card-capacity\">\r\n            <div class=\"result-name\">Max Safe Capacity (80%)<\/div>\r\n            <div class=\"result-val\"><span id=\"res-safe-capacity\">0<\/span><span class=\"result-unit\">\u062f\u0628\u0644\u064a\u0648<\/span><\/div>\r\n        <\/div>\r\n        <div class=\"result-item\">\r\n            <div class=\"result-name\">Total Main Cable Drop<\/div>\r\n            <div class=\"result-val\"><span id=\"res-cable-drop\">0.000<\/span><span class=\"result-unit\">V<\/span><\/div>\r\n        <\/div>\r\n        <div class=\"result-item\">\r\n            <div class=\"result-name\">Main Cable Resistance (R)<\/div>\r\n            <div class=\"result-val\"><span id=\"res-resistance\">0.0000<\/span><span class=\"result-unit\">\u03a9<\/span><\/div>\r\n        <\/div>\r\n        <div class=\"result-item highlight-blue\">\r\n            <div class=\"result-name\">First Light Voltage<\/div>\r\n            <div class=\"result-val\"><span id=\"res-first-light\">0.000<\/span><span class=\"result-unit\">V<\/span><\/div>\r\n        <\/div>\r\n        <div class=\"result-item highlight-green\">\r\n            <div class=\"result-name\">Last Light Voltage<\/div>\r\n            <div class=\"result-val\"><span id=\"res-last-light\">0.000<\/span><span class=\"result-unit\">V<\/span><\/div>\r\n        <\/div>\r\n    <\/div>\r\n\r\n    <div id=\"status-banner\" class=\"status-banner status-pass\">\r\n        <span id=\"status-text\">Calculating...<\/span>\r\n    <\/div>\r\n\r\n    <div class=\"formula-note\">\r\n        Interconnect cable resistance is dynamically calculated and added to the voltage drop per light.\r\n    <\/div>\r\n<\/div>\r\n\r\n<script>\r\n    let currentSys = 48;\r\n    let currentType = 'rgb';\r\n\r\n    function setSystem(sys) {\r\n        currentSys = sys;\r\n        document.querySelectorAll('.sys-btn').forEach(btn => btn.classList.remove('active'));\r\n        document.querySelector(`.sys-btn[data-sys=\"${sys}\"]`).classList.add('active');\r\n        applyDefaults();\r\n    }\r\n\r\n    function setType(type) {\r\n        currentType = type;\r\n        document.querySelectorAll('.type-btn').forEach(btn => btn.classList.remove('active'));\r\n        document.querySelector(`.type-btn[data-type=\"${type}\"]`).classList.add('active');\r\n        applyDefaults();\r\n    }\r\n\r\n    function updateDriverOptions() {\r\n        const pInput = document.getElementById('input-power');\r\n        pInput.innerHTML = ''; \/\/ Clear existing options\r\n        \r\n        let options = [];\r\n        if (currentSys === 24) {\r\n            options = [75, 100, 150, 240, 300];\r\n        } else {\r\n            options = [240, 300, 600, 1200];\r\n        }\r\n        \r\n        options.forEach(val => {\r\n            const opt = document.createElement('option');\r\n            opt.value = val;\r\n            opt.text = val + 'W';\r\n            pInput.appendChild(opt);\r\n        });\r\n    }\r\n\r\n    function driverChanged() {\r\n        const pInput = document.getElementById('input-power');\r\n        const interconnectInput = document.getElementById('input-interconnect');\r\n        const p = parseInt(pInput.value);\r\n\r\n        \/\/ Dynamically adjust interconnect cable based on selected driver size\r\n        if (currentSys === 48) {\r\n            if (p === 240 || p === 300) {\r\n                interconnectInput.value = \"1.5\";\r\n            } else if (p === 600 || p === 1200) {\r\n                interconnectInput.value = \"2.5\";\r\n            }\r\n        } else if (currentSys === 24) {\r\n            interconnectInput.value = \"1.0\";\r\n        }\r\n        \r\n        calculateDrop();\r\n    }\r\n\r\n    function applyDefaults() {\r\n        updateDriverOptions();\r\n        \r\n        const pInput = document.getElementById('input-power');\r\n        const lInput = document.getElementById('input-length');\r\n        const nInput = document.getElementById('input-pcs');\r\n        const wattInput = document.getElementById('input-fixture-watt');\r\n        const dropInput = document.getElementById('input-fixture-drop');\r\n        const interconnectInput = document.getElementById('input-interconnect');\r\n\r\n        if (currentSys === 24) {\r\n            pInput.value = \"300\"; \/\/ Default selection for 24V\r\n            lInput.value = 35;\r\n            dropInput.value = 0.150; \r\n            interconnectInput.value = \"1.0\"; \/\/ 2 x 1.0mm default for 24V\r\n            \r\n            if (currentType === 'rgb') { nInput.value = 16; wattInput.value = 13; }\r\n            if (currentType === 'sc') { nInput.value = 20; wattInput.value = 10; }\r\n        } else {\r\n            pInput.value = \"600\"; \/\/ Default selection for 48V\r\n            lInput.value = 50;\r\n            dropInput.value = 0.257; \r\n            interconnectInput.value = \"2.5\"; \/\/ 2 x 2.5mm default for 48V (600W\/1200W)\r\n            \r\n            if (currentType === 'rgb') { nInput.value = 40; wattInput.value = 13; }\r\n            if (currentType === 'sc') { nInput.value = 50; wattInput.value = 10; }\r\n        }\r\n        calculateDrop();\r\n    }\r\n\r\n    function calculateDrop() {\r\n        if (!document.getElementById('input-power')) return;\r\n        \r\n        const u = currentSys;\r\n        const topologyMultiplier = parseFloat(document.getElementById('input-topology').value) || 1.0;\r\n        const p = parseFloat(document.getElementById('input-power').value) || 0;\r\n        const l = parseFloat(document.getElementById('input-length').value) || 0;\r\n        const s = parseFloat(document.getElementById('input-size').value) || 1;\r\n        const n = parseFloat(document.getElementById('input-pcs').value) || 0;\r\n        const fixWattage = parseFloat(document.getElementById('input-fixture-watt').value) || 0;\r\n        \r\n        \/\/ Interconnect vars\r\n        const spacing = parseFloat(document.getElementById('input-spacing').value) || 1.0;\r\n        const sInterconnect = parseFloat(document.getElementById('input-interconnect').value) || 1.5;\r\n        let baseFixDrop = parseFloat(document.getElementById('input-fixture-drop').value) || 0;\r\n        \r\n        \/\/ Load Math\r\n        const totalLoad = n * fixWattage;\r\n        const safeCapacity = p * 0.8; \r\n\r\n        \/\/ Main Cable Voltage Drop Math\r\n        const rho = 0.0172;\r\n        const i = p \/ u; \r\n        const r = rho * (l \/ s);\r\n        const cableDrop = 2 * r * i;\r\n        const firstLightV = u - cableDrop;\r\n        \r\n        \/\/ Calculate extra voltage drop from the interconnect cables between lights\r\n        const avgCurrentPerFixture = fixWattage \/ Math.max((firstLightV * 0.9), 1); \r\n        const rInterconnect = rho * (spacing \/ sInterconnect);\r\n        const interconnectDrop = 2 * rInterconnect * avgCurrentPerFixture;\r\n        \r\n        const totalDropPerLight = baseFixDrop + interconnectDrop;\r\n\r\n        \/\/ Topology effectively alters the max fixture string distance from the injection point\r\n        const effectiveN = n * topologyMultiplier;\r\n        const lastLightV = firstLightV - (effectiveN * totalDropPerLight);\r\n        \r\n        \/\/ Update Output Values\r\n        document.getElementById('res-total-load').innerText = totalLoad.toLocaleString();\r\n        document.getElementById('res-safe-capacity').innerText = safeCapacity.toLocaleString();\r\n        document.getElementById('res-cable-drop').innerText = cableDrop.toFixed(3);\r\n        document.getElementById('res-resistance').innerText = r.toFixed(4);\r\n        document.getElementById('res-first-light').innerText = Math.max(0, firstLightV).toFixed(3);\r\n        document.getElementById('res-last-light').innerText = Math.max(0, lastLightV).toFixed(3);\r\n        \r\n        \/\/ UI Colors for Load\r\n        const cardLoad = document.getElementById('card-load');\r\n        if (totalLoad > safeCapacity) {\r\n            cardLoad.classList.add('highlight-warning');\r\n        } else {\r\n            cardLoad.classList.remove('highlight-warning');\r\n        }\r\n\r\n        \/\/ Status Validation Limits\r\n        const maxCableDrop = u === 48 ? 24 : 4;\r\n        const minLastLight = u === 48 ? 24 : 20; \r\n        \r\n        const banner = document.getElementById('status-banner');\r\n        const statusText = document.getElementById('status-text');\r\n        \r\n        if (totalLoad > safeCapacity) {\r\n            banner.className = 'status-banner status-fail';\r\n            statusText.innerText = `CRITICAL: Overload! Total load (${totalLoad}W) exceeds safe 80% capacity (${safeCapacity}W).`;\r\n        } else if (cableDrop > maxCableDrop) {\r\n            banner.className = 'status-banner status-fail';\r\n            statusText.innerText = `WARNING: Cable drop exceeds the ${maxCableDrop}V maximum limit!`;\r\n        } else if (lastLightV < minLastLight) {\r\n            banner.className = 'status-banner status-fail';\r\n            statusText.innerText = `WARNING: Last Light Voltage (${lastLightV.toFixed(1)}V) is critically low! Change topology or reduce fixtures.`;\r\n        } else {\r\n            banner.className = 'status-banner status-pass';\r\n            statusText.innerText = `PASS: Circuit is stable. Load and voltages are within safe operating limits.`;\r\n        }\r\n    }\r\n\r\n    \/\/ Initialize defaults on page load\r\n    setTimeout(applyDefaults, 100);\r\n<\/script>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>","protected":false},"excerpt":{"rendered":"<p>Advanced Voltage Drop &#038; Load Calculator Calculate cable resistance, load capacity, and topology limitations. 1. Select System Voltage 24V System 48V System 2. Select Fixture Type RGB (13W) Single Color (10W) 3. Engineering Parameters Power Feed Topology End-Fed (Start of the lights)Center-Fed (Middle of the lights)Dual End-Fed (Power at both ends) Driver Power (W) Main [&hellip;]<\/p>","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"elementor_header_footer","meta":{"_acf_changed":false,"footnotes":""},"class_list":["post-15446","page","type-page","status-publish","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.6 (Yoast SEO v28.5) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Linear Light Voltage Drop CalculationElementor #15446 - Hondel Lighting Limited<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/hondellighting.com\/ar\/linear-light-voltage-drop-calculation.html\/\" \/>\n<meta property=\"og:locale\" content=\"ar_AR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Elementor #15446\" \/>\n<meta property=\"og:description\" content=\"Advanced Voltage Drop &#038; Load Calculator Calculate cable resistance, load capacity, and topology limitations. 1. Select System Voltage 24V System 48V System 2. Select Fixture Type RGB (13W) Single Color (10W) 3. 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