Led Light Calculator

LED Light Savings Calculator

Use this calculator to estimate your potential energy and cost savings by switching from traditional incandescent or CFL bulbs to energy-efficient LED lighting. See how much you can save annually and over the lifespan of your new LED bulbs!

function calculateLED() { var oldWattage = parseFloat(document.getElementById('oldWattage').value); var ledWattage = parseFloat(document.getElementById('ledWattage').value); var numBulbs = parseFloat(document.getElementById('numBulbs').value); var hoursPerDay = parseFloat(document.getElementById('hoursPerDay').value); var costPerKWH = parseFloat(document.getElementById('costPerKWH').value); var oldBulbLifespan = parseFloat(document.getElementById('oldBulbLifespan').value); var ledBulbLifespan = parseFloat(document.getElementById('ledBulbLifespan').value); var costOldBulb = parseFloat(document.getElementById('costOldBulb').value); var costLedBulb = parseFloat(document.getElementById('costLedBulb').value); // Input validation if (isNaN(oldWattage) || isNaN(ledWattage) || isNaN(numBulbs) || isNaN(hoursPerDay) || isNaN(costPerKWH) || isNaN(oldBulbLifespan) || isNaN(ledBulbLifespan) || isNaN(costOldBulb) || isNaN(costLedBulb) || oldWattage <= 0 || ledWattage <= 0 || numBulbs <= 0 || hoursPerDay <= 0 || costPerKWH <= 0 || oldBulbLifespan <= 0 || ledBulbLifespan <= 0 || costOldBulb < 0 || costLedBulb 0) { paybackPeriodYears = initialLEDInvestment / totalAnnualSavings; } else { paybackPeriodYears = Infinity; // Will display as "N/A" or similar } var yearsLEDWillLast = ledBulbLifespan / (hoursPerDay * 365); var totalSavingsLifespan = (totalAnnualSavings * yearsLEDWillLast) – initialLEDInvestment; // Net savings over LED lifespan // Display results document.getElementById('annualEnergySavingsKWH').innerHTML = annualEnergySavingsKWH.toFixed(2); document.getElementById('annualElectricityCostSavings').innerHTML = '$' + annualElectricityCostSavings.toFixed(2); document.getElementById('annualBulbReplacementSavings').innerHTML = '$' + annualBulbReplacementSavings.toFixed(2); document.getElementById('totalAnnualSavings').innerHTML = '$' + totalAnnualSavings.toFixed(2); document.getElementById('initialLEDInvestment').innerHTML = '$' + initialLEDInvestment.toFixed(2); if (paybackPeriodYears === Infinity) { document.getElementById('paybackPeriod').innerHTML = 'N/A (No savings or negative savings)'; } else if (paybackPeriodYears < 0) { document.getElementById('paybackPeriod').innerHTML = 'N/A (Negative savings)'; } else { document.getElementById('paybackPeriod').innerHTML = paybackPeriodYears.toFixed(1) + ' years'; } document.getElementById('totalSavingsLifespan').innerHTML = '$' + totalSavingsLifespan.toFixed(2); document.getElementById('result').style.display = 'block'; }

Understanding LED Lighting

LED (Light Emitting Diode) lighting has revolutionized the way we illuminate our homes and businesses. Unlike traditional incandescent bulbs that produce light by heating a filament, or CFLs (Compact Fluorescent Lamps) that use gas discharge, LEDs produce light through electroluminescence, making them significantly more efficient.

Why Switch to LEDs?

• Energy Efficiency: LEDs consume up to 90% less energy than incandescent bulbs and 50% less than CFLs for the same light output (lumens). This directly translates to lower electricity bills.
• Long Lifespan: LEDs can last 25,000 to 50,000 hours or more, compared to 1,000-2,000 hours for incandescents and 8,000-10,000 hours for CFLs. This drastically reduces the frequency and cost of bulb replacements.
• Durability: Being solid-state lighting, LEDs are more resistant to breakage from impacts and vibrations.
• Instant On: Unlike some CFLs, LEDs provide full brightness instantly without a warm-up period.
• Environmental Benefits: LEDs contain no mercury (unlike CFLs) and their longer lifespan means less waste going into landfills. Their lower energy consumption also reduces carbon emissions.
• Design Flexibility: LEDs come in a wide range of colors, shapes, and sizes, offering versatile lighting solutions for any application.

How the Calculator Works

This calculator helps you quantify the financial benefits of upgrading to LED lighting. Here's a breakdown of the inputs and outputs:

• Current Bulb Wattage (W): The power consumption of your existing bulbs (e.g., 60W incandescent).
• LED Equivalent Wattage (W): The power consumption of an LED bulb that provides similar brightness (e.g., a 9W LED can replace a 60W incandescent).
• Number of Bulbs: The total number of bulbs you plan to replace.
• Hours Used Per Day: How many hours, on average, these lights are on daily.
• Electricity Cost Per kWh ($): Your local electricity rate. You can usually find this on your utility bill.
• Current Bulb Lifespan (Hours): The average rated lifespan of your existing bulbs.
• LED Bulb Lifespan (Hours): The average rated lifespan of the LED bulbs you are considering.
• Cost of One Current Bulb ($): The purchase price of one of your existing bulbs.
• Cost of One LED Bulb ($): The purchase price of one LED bulb.

The calculator then uses these figures to determine your annual energy savings, electricity cost savings, and the money saved by not having to frequently replace cheaper, shorter-lived bulbs. It also calculates the initial investment for the LEDs, the payback period, and your total net savings over the entire lifespan of the LED bulbs.

Tips for Choosing LED Lights

• Lumens, Not Watts: When replacing old bulbs, focus on matching the lumens (brightness) rather than the wattage. The LED wattage will be much lower for the same brightness.
• Color Temperature (Kelvin): Choose the right color temperature for your space. Lower Kelvin (2700K-3000K) provides warm, yellowish light, while higher Kelvin (4000K-5000K) offers cooler, bluer light.
• Dimmability: If you need dimmable lights, ensure the LED bulbs are specifically rated as "dimmable" and are compatible with your dimmer switch.
• Beam Angle: Consider the beam angle for directional lighting (spotlights) versus omnidirectional (general room lighting).
• Energy Star Rating: Look for Energy Star certified LEDs, which meet strict efficiency and quality guidelines.

Making the switch to LED lighting is a smart investment that pays off in significant savings and improved lighting quality. Use this calculator to see your potential benefits today!