How Much Does It Cost to Leave a Wall Light on All Night?

A 7W LED wall light left on for eight hours a night costs about 1.03 cents a night, or $3.77 a year at the US average residential rate of 18.44 cents per kWh. That is the whole cost to leave a light on all night, and it works out at 0.19% of what an average US home spends on electricity in a year.

The arithmetic is watts divided by 1,000, times hours, times the price you pay per kWh. I ran it on a fixture whose wattage is published rather than guessed at: the Houseland globe vanity sconce lists a 7W warm-light or a 7W white-light bulb on an E27 socket, and standard US E26 bulbs fit the same socket.

What does it cost to leave a light on all night?

Eight hours of a 7W bulb uses 0.056 kWh, so at the US average of 18.44 cents per kWh one night costs 1.03 cents. Repeat that every night of the year and the fixture draws 20.4 kWh, which is $3.77.

Your rate moves that number far more than your habits do. The national average was 18.44 cents per kWh in May 2026, but the identical bulb runs to $2.52 a year on Idaho’s 12.35 cents and $10.63 a year on Hawaii’s 52 cents.

A pair either side of a mirror doubles the row you land on. Two 7W bulbs burning every night of the year come to $7.54 at the average rate, which is 63 cents a month.

How do I run this sum on my own bulb and rate?

Five steps with a calculator, and step 1 is the one people get wrong.

1. Read the watts printed on the bulb itself, not the “60W equivalent” claim on the front of the box. That equivalence describes brightness, not draw, and dropping 60 into the sum instead of 7 inflates the answer by more than eight times.
2. Divide the watts by 1,000 to get kilowatts: 7W becomes 0.007 kW.
3. Multiply by the hours it burns: 0.007 kW times 8 hours is 0.056 kWh a night.
4. Multiply by your own rate. Take the last bill, divide the dollar total by the kWh on it, and use that figure — the all-in number carries delivery and fees, so it usually beats the supply rate you were quoted.
5. Multiply by 365 nights: 0.056 kWh times 365 times $0.1844 is $3.77 for the year.

That is the formula every lighting calculator runs behind its buttons. Inch Calculator works the same sum on a three-bulb fixture: 180W for 8 hours is 1.44 kWh a day.

Two mistakes account for nearly every wild answer people post. Feeding the equivalence figure into step 2 turns $3.77 into $32.31, because you have priced a bulb nobody is running. Using the supply rate from a comparison site instead of the all-in rate off the bill understates the answer, often by 3 to 5 cents per kWh once delivery lands, which on 20.4 kWh a year is only 61 cents to $1.02 — small in absolute terms, and a reminder that at these wattages precision is cheap and the decision is easy.

LED vs incandescent: what does the swap really save?

Swapping a 60W incandescent for a 7W LED cuts an eight-hour night from 8.85 cents to 1.03 cents, which hands back $28.54 over a year of nights. That single swap is worth more than any amount of switching discipline.

The four wattages are the bulb classes WattCosts compares; the dollars are those wattages priced at 18.44 cents per kWh. Check the vintage of any figure you find, including theirs — that page now prices a 10W LED running non-stop at $1.34 a month on an 18.56-cent rate, where an older copy of the same page said $1.21 on 17.98 cents. The 7W bulb on the same non-stop schedule is $0.93 a month.

A fixture that never gets wired in has a different sum again, since you are buying cells rather than kWh; that trade-off is worth reading through if you are weighing battery pieces against plug-in ones.

Does leaving it on all night wear the bulb out?

Not quickly. The Department of Energy puts the useful life of good-quality white LED products at 30,000 to 50,000 hours, measured to L70 — the hour at which output has dropped to 70% of new.

At eight hours a night, 30,000 hours is 3,750 nights, so a decade of never switching off. Push it to 12 hours a night and the same bulb reaches L70 after 2,500 nights, closer to seven years. An incandescent rated near 1,000 hours would be finished in 125 nights, about four months.

Across a 30,000-hour life the 7W bulb burns 210 kWh, roughly $38.72 of electricity in total. Over that span what you paid for the bulb matters as much as what you pay to run it, so buy on lumens and rated hours rather than on watts saved.

Heat is the thing that actually shortens LED life, and an enclosed shade traps it. An exposed globe on a swivel head sits in open air, which is also why the aiming advice for a bedside reading light is about angle rather than wattage.

From the shop

Vanity Sconce with Exposed Globe Bulb, Adjustable Iron Wall Lamp, 5 Colors

The globe vanity sconce takes a 7W warm-light or 7W white-light bulb on an E27 socket that standard US E26 bulbs fit, and it hardwires to a standard wall box with no visible cord. It stands 5.1 in (13 cm) tall, reaches 6.7 in (17 cm) from the wall, and the head swivels to aim the light up, down or across.

View the globe vanity sconce — 10 colourways & current price

Where is the money on your bill actually going?

Lighting is about 6% of the electricity a US home uses — 81 billion kWh across the country in 2020, on EIA’s residential survey. One sconce is a rounding error inside that 6%.

The average US residential customer bought 10,791 kWh in a year, which is about $1,990 at 18.44 cents per kWh. The 7W sconce on all night is $3.77 of that $1,990, or 0.19% of the bill. A hot tap left running while you brush your teeth is a bigger line item than the hallway light you feel guilty about.

Plenty of lighting-cost pages still quote 8-10% of a household bill for lighting. EIA’s own survey says 6%, and that gap is what the LED changeover did: the share fell because the watts fell, not because anyone started switching lights off more diligently.

Scale it if the number still feels abstract. At 20.4 kWh a year each, you would need 529 of these running from dusk to dawn, every night, to burn what one average home already burns in a year. Two of them in a hallway come to 41 kWh a year, which is 0.4% of that 10,791 kWh.

What I'd do

Leave the 7W one on. $3.77 a year buys a lit stairway at 3am, and no amount of discipline at the switch will beat what a lower-wattage bulb already did.

• Work out your own rate from the bill before you judge the number. On 52 cents per kWh the same night costs 2.91 cents, and the sum is worth doing again.
• Cut watts, not hours. Dropping from 60W to 7W saves $28.54 a year; switching a 7W bulb off two hours earlier saves 94 cents.
• Aim the light instead of dimming it. The Houseland sconce’s head swivels up, down or across, and it covers 3-5 square meters, about 32-54 sq ft, so it lands on the floor of a hallway rather than filling a bedroom.
• Ignore the switching advice and check the schedule instead. A motion sensor that cuts a 7W fixture from 8 hours to 2 saves $2.83 a year, which is less than most sensors cost to buy.
• Wire it rather than run a cable to it. This one hardwires to a standard wall box with no visible cord; if yours plugs in, there are ways to deal with the leftover cable that do not involve a staple gun.

Every fixture in the Houseland wall lamps collection publishes the bulb wattage it ships with, which is the one input this sum needs and the one number most listings leave out.

Shop wall lamps from Houseland

-20%Globe Wall Sconce with Switch, Pull Chain Glass Wall Lamp, 4 Shapes 4 Colorsfrom $104.46$130.58-20%Bear Nursery Wall Sconce, Adjustable Iron Wall Lamp with Wood Base, 8 Colorsfrom $97.89$122.36-20%Macaron Bedside Wall Sconce, Adjustable Wood Base Wall Lamp, 3 Shapes 13 Colorsfrom $86.47$108.09-20%Fluted Resin Hallway Sconce, Up Down Wall Light in 4 Colors, Two G9 Bulbsfrom $83.79$104.74Wood Flush Mount Ceiling Light, Walnut or Natural, Slim or Tall LED Fixturefrom $99.95

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