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Christmas lights don't use a lot of electricity — especially LED ones. A 100-bulb LED mini set draws only about 4 to 5 watts, so running it six hours a night through December costs roughly 15 cents. Incandescent sets use around ten times more power, but even a large incandescent display adds a few dollars — not hundreds — to your electric bill over the season.
How much electricity do Christmas lights use? Watts, wattage and kilowatt-hours
The honest answer is: far less than most people fear, and it comes down to bulb type. LED (light-emitting diode) bulbs turn almost all their energy into light instead of heat, so they sip power. Incandescent bulbs waste most of their energy as heat, which is why they run hot and pull so much more current. Once you know the wattage of your sets, the cost in kilowatt-hours (kWh) is easy to work out.
| Light type | Power draw | 6 hrs/night for 30 days | Season cost* |
|---|---|---|---|
| LED mini set (100 bulbs) | ~4-5 watts | ~0.9 kWh | ~$0.15 |
| Incandescent mini set (100 bulbs) | ~40 watts | ~7.2 kWh | ~$1.15 |
| LED C9 strand (25 bulbs) | ~3-5 watts | ~0.8 kWh | ~$0.13 |
| Incandescent C9 strand (25 bulbs) | ~175 watts | ~31.5 kWh | ~$5.00 |
*At the U.S. average electricity rate of about 16 cents per kWh. Your rate and hours may differ.
LED vs incandescent power draw and energy-efficient running cost
LEDs use roughly 80 to 90 percent less electricity than incandescent bulbs for the same brightness. That gap is the whole story. A single LED strand barely moves the meter — you'd need dozens running all month to add up to a kilowatt-hour or two. Because each LED strand draws so little power, you can also connect many strands end to end from one plug without overloading the circuit, which keeps a whole-house display cheap to power. If cutting your running cost is the goal, our roundup of the best LED Christmas lights is the place to start, and the explainer are LED Christmas lights cheaper to run puts real numbers on the savings.
Christmas light wattage: mini sets, C9 bulbs and amps
Wattage varies a lot by bulb size. A 100-bulb LED mini set sits at about 4 to 5 watts, while its incandescent twin is near 40 watts. Step up to the big C9 or C7 bulbs and each incandescent bulb draws roughly 5 to 7 watts, so a single 25-bulb strand can pull 125 to 175 watts. Their LED versions stay under 5 watts. Wattage also sets how many amps a run draws, which matters for not overloading a circuit — for that math see how many amps do Christmas lights use and the deeper breakdown in how much electricity do Christmas lights use.
Cost per kWh on your electric bill
Turning watts into money is simple. Multiply the wattage by the hours run, divide by 1,000 to get kilowatt-hours, then multiply by your electricity rate. At the U.S. average of about 16 cents per kWh, an LED set costs cents for the whole month, while an incandescent mini set costs about a dollar. The gap only widens as the display grows. A modest LED display is invisible on your electric bill; a large incandescent one is where you'll actually notice a few extra dollars.
How a timer cuts running cost
The cheapest watt is the one you never burn. Because holiday lights only need to shine in the evening, a timer that runs them for six peak hours instead of all night can halve their kilowatt-hours at a stroke — and it stops them running unattended. Pair a timer with energy-efficient LEDs and your seasonal cost drops to near nothing.
- Choose LED over incandescent. This alone cuts power draw by 80 to 90 percent.
- Use a timer. Running only during peak evening hours trims kilowatt-hours. See the best Christmas light timer.
- Don't leave lights on overnight. Every hour off is electricity saved.
- Match wattage to your circuit. Splitting a big display across outlets keeps current safe.
The bottom line on Christmas light electricity use
For nearly everyone, Christmas lights are one of the cheapest parts of the holidays to run. LEDs cost cents for the whole season, and even a modest incandescent display costs only a few dollars. The bigger the display and the older the bulbs, the more it matters — so if your electric bill is a concern, switch to LED and put the lights on a timer. For more, browse the Christmas Lights 101 & Safety hub.
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