Every December, the same worry stops homeowners from lighting up the way they'd like: "Won't that wreck my electric bill?" After powering displays on 1,000+ homes across Plano, Frisco, Dallas, and the rest of DFW since 2009, we can tell you the honest answer — with the actual watt counts and the actual Texas math.
The quick answer
No — not if you're using LED lights. A typical 300-bulb C9 LED roofline display draws about 300 watts — less than many living-room TVs — and costs roughly $10–$15 for the entire season at Texas's average electricity rate of about 15¢ per kilowatt-hour. The same 300-bulb display in old-style incandescent bulbs draws about 2,100 watts and costs $80–$90 or more per season. Switching to LED cuts Christmas-light electricity use by roughly 85–90%.
That gap — not aesthetics — is the single biggest reason every display we install uses commercial-grade C9 LED bulbs. Below is exactly how the numbers work, so you can run the math for your own home.
How many watts do Christmas lights use?
Wattage depends almost entirely on two things: the bulb type (LED vs. incandescent) and the bulb size (large C9s vs. mini lights). Here are the real-world numbers we see across DFW installs:
| Bulb type | Watts per bulb | Watts per 100 bulbs |
|---|---|---|
| C9 LED (what we install) | ~1W | ~100W |
| C9 incandescent | ~7W | ~700W |
| Mini LED | ~0.07W | ~7W |
| Mini incandescent | ~0.4W | ~40W |
A few practical takeaways. First, the bulb-for-bulb gap is enormous: one incandescent C9 burns as much power as seven LED C9s. Second, mini lights sip power in either format, but they're rarely the backbone of a roofline display — the big, visible C9s are, which is where the LED choice matters most. Third, low wattage isn't just about cost: LED strands draw so little current that long rooflines and wrapped trees can run safely on a single circuit, while large incandescent displays routinely trip breakers.
The worked math: a full DFW season, line by line
Here's the season cost for a typical 300-bulb C9 roofline display — about what a single-story DFW home with 150–200 feet of roofline uses — running on a timer from dusk to about 11pm:
- Load: 300 bulbs × 1W = 300W, or 0.3 kilowatts
- Run time: ~6 hours per night × 45 nights (Thanksgiving week through early January) = 270 hours
- Energy used: 0.3 kW × 270 hours = 81 kilowatt-hours
- Season cost: 81 kWh × ~15¢/kWh ≈ $12
Now the identical display in incandescent: 300 bulbs × 7W = 2,100W (2.1 kW). Over the same 270 hours that's 567 kWh — about $85 for the season, and that's before you account for the strands you'll replace. Even a large estate display — say 600 C9 LEDs plus several wrapped trees — typically lands in the $25–$40 range for the whole season in electricity. In incandescent, that same estate display would push $200+.
For perspective, 81 kWh over six weeks is less electricity than most households' refrigerators use in the same stretch, and far less than a single space heater running a few evenings. Spread across two billing cycles, an LED display adds roughly $5–$8 to each month's bill — a number most DFW homeowners simply never notice. The incandescent version shows up clearly: an extra $40+ on each of two consecutive bills, usually right alongside December's heating costs.
What moves the number up or down
Four variables drive your actual cost — and only one of them is hard to control.
The biggest lever. Dusk-to-dawn roughly doubles the cost of dusk-to-11pm — which is why every display we install runs on a timer.
Scales linearly: double the bulbs, double the cost. Even a 600-bulb LED display is only ~$24–$30 for the season.
Most North Texas plans land between 12¢ and 18¢ per kWh, so your real number sits within a few dollars of the math above.
The silent budget-eaters. One air-blown inflatable can draw 150–200W — more than half an entire 300-bulb LED roofline.
Two Texas-specific notes worth knowing. Many North Texas electricity plans offer "free nights" or reduced evening rates — and Christmas lights run almost entirely in those windows, so some homeowners effectively light their display for pennies. And because DFW's display season is short and predictable (most homes light up Thanksgiving week and go dark the first week of January), the cost is a one-time seasonal blip, not a recurring expense — takedown in January returns your bill to normal immediately.
Estimate your own display in 30 seconds
You don't need a spreadsheet — just three numbers. Count (or estimate) your bulbs, multiply by the watts per bulb from the table above to get your load, then use this shortcut: every 100 watts of load costs about $4 per season at Texas rates on a 6-hour timer. A 400-bulb C9 LED display? 400W → about $16 for the season. Three wrapped trees with 1,800 mini LEDs? Roughly 126W → about $5. A 250-bulb incandescent roofline? 1,750W → about $70, and climbing every year those strands degrade. If you'd rather see what the lights themselves cost to install professionally, our DFW pricing guide breaks down every package.
Why the LED-vs-incandescent gap is the whole story
Everything above reduces to one decision. LEDs convert most of their energy into light; incandescents convert most of theirs into heat. That's why the same display can cost $12 or $85 for the season, why LED bulbs stay cool to the touch on a dry roofline, and why they last 10+ seasons instead of one or two. If you're weighing the trade-offs in detail — glow color, up-front price, lifespan — we've written a full LED vs. incandescent comparison.
Does professional installation change your electricity cost?
Only in your favor. Professionally installed displays in DFW run on commercial-grade C9 LED bulbs — the ~1W bulbs in the table above — with timers included, so the running cost of even a $700–$2,500+ professional installation is typically $10–$30 of electricity for the whole season. The installation price covers design, labor, materials, in-season maintenance, and January takedown; the power to run it is close to a rounding error. That's true whether we're lighting a single-story roofline in Plano, a two-story in Frisco, or an estate with wrapped oaks in McKinney.
One honest caveat from 15+ years of doing this: the electricity question, while it's the one everyone asks, is the smallest line item in holiday lighting. The decisions that actually move your budget are bulb quality, design scope, and whether someone insured is on the ladder instead of you.
Frequently asked questions
Do Christmas lights use a lot of electricity?
Not if they're LED. A typical 300-bulb C9 LED display draws about 300 watts and costs roughly $10–$15 for the whole season at Texas's ~15¢/kWh average. The same display in incandescent bulbs draws about 2,100 watts and costs $80–$90+.
How much electricity do Christmas lights use per month?
A 300-bulb C9 LED display on a 6-hour timer uses about 54 kWh per month — roughly $5–$8 on a Texas bill. The same display in incandescent bulbs uses about 378 kWh per month, adding $40+ to each December and January bill.
How much does it cost to run Christmas lights all night?
Roughly double the dusk-to-bedtime number. Running a 300-bulb C9 LED display 12 hours a night instead of 6 brings a Texas season from about $12 to about $24. We install timers on every project so the lights run dusk to around 11pm automatically.
Will Christmas lights raise my electric bill noticeably?
An LED display adds only a few dollars a month — most homeowners never notice it on the bill. A large incandescent display is a different story: $25–$30+ per month is common, which is one of several reasons professional installers use commercial-grade LED.
