Do Christmas lights raise your electric bill?

Yes, Christmas lights raise your electric bill — but with LED lights the increase is usually just a few dollars for the entire season. LED string lights draw only about 4 to 6 watts per 100 bulbs, so an indoor tree costs pennies a night. The bill only climbs when you run old incandescent sets or large outdoor displays, which can cost ten times more. Here's the exact watts-to-dollars math so you can see what your own display actually costs.

The short answer: pennies for LED string lights, real money for incandescent

Whether your lights make a dent depends almost entirely on bulb type. LED Christmas lights sip power — a 100-bulb strand draws roughly 5 watts, about the same as a phone charger. Incandescent lights are the opposite: the same 100 mini bulbs draw around 40 watts, and C7 or C9 bulbs draw far more. So a modest LED tree adds a few dollars across December, while a big incandescent outdoor display can add $20, $30, or more. The bill is a bulb-type story first and a display-size story second.

How to calculate your cost per night: watts, kilowatt-hours and your electricity rate

The formula is simple: total watts times hours per day, divided by 1,000, gives kilowatt-hours (kWh) per day; multiply by your electricity rate. The U.S. residential average is roughly 17 cents per kWh, though it varies a lot by state — check your own bill for the real number. Here's a worked example: a display pulling 200 watts, run 6 hours a night, uses 1.2 kWh per day, which at 17 cents is about 20 cents a day, or roughly $6 over a 30-day season.

Estimates at the U.S. average of ~17 cents per kWh; your rate and hours will change the totals.

LED vs. incandescent watts: an 80 to 90 percent difference in season cost

The comparison table makes the case on its own. For the same brightness, LEDs use roughly 80 to 90 percent less electricity than incandescent bulbs. On a small indoor tree the savings are just a couple of dollars, so there's no rush to replace working sets. On a large outdoor display, the difference is $20 or more every season, so LEDs typically pay for themselves within a year or two — and they last far longer and run cool. See LED vs. incandescent Christmas lights and do LED Christmas lights use less electricity for the full comparison.

Don't forget inflatables and projectors

String lights are cheap to run; the power-hungry yard decorations are the blowers and motors. An inflatable's fan runs continuously to keep it upright and can draw 40 to 150 watts on its own — often more than a whole LED display. Laser and hologram projectors are modest, but a yard full of inflatables can quietly outspend all your lights combined. See how much electricity a Christmas inflatable uses if inflatables are part of your setup.

The two biggest ways to cut the electric bill: LED, a timer or smart plug, less run time

You have two high-value levers. First, use LED sets — the single biggest factor in the whole equation. Second, put everything on a timer or smart plug so the display runs a few evening hours instead of all day and night. Cutting run time from 12 hours to 6 halves that portion of the cost, and you were asleep or out for most of those hours anyway. Together, LEDs plus a timer turn "raises the bill" into a rounding error.

Dig into the numbers with how much electricity Christmas lights use and how many watts LED Christmas lights use. Automate the off-time with the best Christmas light timer. For more basics, visit the Christmas Lights 101 & Safety hub.

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