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LED Holiday Lights Savings Calculator

Compare the electricity cost of incandescent versus LED holiday string lights.

Result

Savings Using LED Lights
$10.14
Incandescent Season Cost
$11.52
LED Season Cost
$1.38

Based on typical wattage for a standard 100-bulb mini-light string: about 40W for incandescent versus about 4.8W for equivalent LED strings, roughly an 88% reduction, consistent with LED's efficiency advantage over incandescent lighting generally.

About the LED Holiday Lights Savings

The LED Holiday Lights Savings Calculator compares the electricity cost of running incandescent versus LED string lights during a holiday season, using the number of strings, hours lit per day, and days displayed. It's for anyone deciding whether replacing old incandescent mini-lights with LED strings is worth it purely as an electricity question, separate from the retail cost of new strings.

How It Works

You enter how many light strings you're running, how many hours per day they're lit, how many days the display stays up, and your electricity rate. The calculator applies a fixed wattage assumption for a standard 100-bulb mini-light string, 40W for incandescent and 4.8W for LED, multiplies each by your total lit hours to get seasonal kilowatt-hours, then converts both to dollars at your rate and reports the difference.

Total hours = hours/day x days displayed. Incandescent kWh = strings x 40W x total hours / 1000. LED kWh = strings x 4.8W x total hours / 1000. Cost = kWh x electricity rate. Savings = incandescent cost - LED cost.

Formula & Methodology

With the default 10 strings running 6 hours a day for a 30-day display, total lit hours come to 180. Incandescent draw works out to 10 x 40W x 180h / 1000 = 72 kWh for the season, while LED draw is 10 x 4.8W x 180h / 1000 = 8.64 kWh. At $0.16/kWh that's $11.52 versus $1.38, a seasonal difference of about $10.14 for that display size.

Examples

10-String Front Yard Display

Using the defaults, 10 strings run 6 hours a day for a 30-day season at $0.16/kWh cost $11.52 with incandescent lights versus $1.38 with LEDs, saving about $10.14 for the season.

Larger Display, Longer Season

15 strings run 5 hours a day for 45 days at $0.14/kWh cost $18.90 with incandescent lights versus $2.27 with LEDs, an estimated $16.63 in seasonal savings.

Advantages

  • Isolates the electricity cost difference specifically for holiday lighting, a use case with unusual runtime (daily but only during a short season) that general appliance calculators don't model.
  • Lets you test how display size (string count) or runtime hours change the seasonal cost before buying replacement strings.
  • Uses a per-string wattage figure that matches how holiday lights are actually sold and installed, rather than requiring you to know total display wattage.

Common Mistakes

  • Assuming holiday lights use enough electricity to matter over a full year, when the actual comparison is usually a few dollars over a 20-60 day season.
  • Forgetting that larger bulb formats like C9 strings, rope lights, or inflatables draw significantly more than a standard mini-light string, making the built-in wattage assumptions too low for those setups.
  • Comparing seasonal electricity savings alone against the sticker price of new LED strings without also counting their multi-season lifespan and reduced replacement-bulb cost.

Edge Cases to Watch For

  • The 40W and 4.8W figures apply to a standard 100-bulb mini-light string; larger C9 bulb strings, icicle strings, or oversized inflatable displays draw more power and will show a smaller relative savings percentage than this calculator's defaults suggest.
  • Running lights on a timer for fewer hours per day shrinks total kWh proportionally on both sides, so the dollar gap narrows even though the percentage savings stays the same.
  • The calculator does not add the purchase price of new LED strings; it only compares the electricity cost of running lights you already own or are considering.

Common Use Cases

  • Homeowners weighing whether to replace an existing incandescent light display with LED strings before the next holiday season.
  • Renters or apartment residents on a metered electricity plan who want to budget a seasonal display's added cost.
  • Anyone comparing the total energy cost of a large multi-string outdoor display against a smaller one.
Written & fact-checked by the Calculateus TeamLast updated August 5, 2026How we verify our formulas

Frequently asked questions

Do LED holiday lights actually last longer too?

Yes - LED light strings typically last 10,000-25,000+ hours of use compared to a few thousand hours for incandescent mini-lights, so beyond the electricity savings shown here, LED strings also need replacing far less often, adding further savings over a household's holiday lighting budget across multiple seasons.

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Conclusion

The comparison comes down to a large wattage gap, about 40W versus 4.8W per string, multiplied by however many hours the display runs. For most seasonal displays that gap adds up to single or low double-digit dollar savings rather than a dramatic bill change, useful context when deciding when a lighting upgrade pays for itself.