How Much Does Home Lighting Cost, and How Much Can LEDs Save?

What Determines Your Home’s Lighting Costs?

The cost of lighting a home depends primarily on four factors:

• The number of bulbs in use
• Each bulb’s wattage
• How many hours the bulbs are turned on
• The household’s electricity rate

A bulb that uses less electricity and lasts longer may cost more upfront but can still be much less expensive to operate over its full lifespan.

Because every household has a different combination of bulbs, electricity rates, and daily habits, there is no single lighting cost that applies to every home.

How Much Does the Average Household Spend on Lighting?

In 2020, lighting accounted for approximately 5% of the average US home’s energy costs. This represented about $92 per year in electricity used for lighting.

At 2025 electricity rates, that average cost was estimated to be closer to $120 per year. In areas with expensive electricity rates, annual lighting costs could exceed $270.

These figures cover the electricity used to power home lighting. A household’s total long-term lighting expenses also include the initial purchase price of its bulbs and the cost of replacing them over time.

How Daily Lighting Habits Affect Costs

The amount of time that household lights remain on has a direct impact on electricity use.

The Energy Information Administration's Residential Energy Consumption Survey in 2020 reported that households use these lighting habits:

• Six bulbs on for one to four hours per day
• Four bulbs on for four to eight hours per day
• Two bulbs on for more than eight hours per day

Additionally, approximately 40% of homes reported leaving at least one outdoor light on throughout the night, every night.

A single light may not seem like a major expense. However, its electricity consumption repeats every day. Homes with several inefficient bulbs that remain on for long periods can therefore accumulate much higher annual lighting costs.

Upgrading frequently used bulbs and reducing unnecessary hours of operation can help lower these recurring expenses.

How Do You Calculate the Cost of Operating a Light Bulb?

To calculate a bulb’s operating cost, you need to know:

• The bulb’s wattage
• How many hours it is used
• Your electricity rate in kilowatt-hours

Begin by multiplying the bulb’s wattage by its hours of use:

Wattage × hours used = watt-hours of electricity

Then divide the result by 1,000 to convert watt-hours into kilowatt-hours:

Watt-hours ÷ 1,000 = kilowatt-hours

Finally, multiply the kilowatt-hours used by your electricity rate:

Kilowatt-hours × electricity rate = operating cost

This calculation can be completed for how much energy the light bulb uses in one day and then multiplied by the number of days the bulb operates during the year.

How Much Does It Cost to Operate an Incandescent Bulb?

Consider a typical 60-watt incandescent light bulb that is turned on for five hours each day.

First, calculate its daily electricity use:

60 watts × 5 hours = 300 watt-hours per day

Divide by 1,000 to convert that amount into kilowatt-hours:

300 watt-hours ÷ 1,000 = 0.3 kilowatt-hours per day

At an electricity rate of $0.20 per kilowatt-hour, the daily operating cost is:

0.3 kWh × $0.20 = $0.06 per day

Over one year, that equals approximately $22 in electricity for a single bulb.

When several incandescent bulbs are used for similar amounts of time, these costs multiply. Five bulbs operating under the same conditions would cost approximately $110 per year to power.

How Much Does It Cost to Operate an LED Bulb?

Now consider a typical 9-watt LED that performs a similar function to the 60-watt incandescent bulb and is also used for five hours each day.

Its daily electricity use is:

9 watts × 5 hours = 45 watt-hours per day

Convert that figure to kilowatt-hours:

45 watt-hours ÷ 1,000 = 0.045 kilowatt-hours per day

At an electricity price of $0.20 per kilowatt-hour, the LED costs:

0.045 kWh × $0.20 = $0.009 per day

Over one year, that LED would cost just over $3 to operate.

Replacing the 60-watt incandescent with the 9-watt LED would therefore lower annual operating costs from approximately $22 to just over $3. That represents an approximately 85% decrease.

Why Bulb Lifespan Also Affects Lighting Costs

Electricity is only one part of a bulb’s total cost. Households must also consider how frequently each bulb needs to be replaced.

The three main household lighting technologies have substantially different lifespans:

• LEDs typically last more than 25,000 hours
• CFLs typically last between 8,000 and 15,000 hours
• Incandescent bulbs typically last between 1,000 and 2,000 hours

Over a 20,000-hour operating period, a household would generally need:

• One LED
• Three CFLs
• Approximately 20 incandescent bulbs

An incandescent bulb may have a low purchase price of approximately $1 to $3, while an LED may cost between $2 and $8. However, comparing the price of one LED with one incandescent does not account for the many replacement bulbs that may be needed over the LED’s lifespan.

LEDs reduce costs in two ways: they use less electricity while operating and need to be replaced less frequently.

Which Bulbs Should You Replace First?

If you want to reduce lighting costs gradually, begin with bulbs that create the greatest recurring expenses.

Consider prioritizing:

• Incandescent bulbs
• Bulbs used for several hours each day
• Lights in frequently occupied rooms
• Outdoor lights that remain on overnight

Replacing an inefficient bulb that operates for five or more hours per day will generally produce more annual savings than replacing a bulb that is rarely used.

This approach allows you to target the bulbs that have the combination of high wattage and long operating time.

Does Turning Off LED Lights Still Matter?

Yes. LEDs use much less energy than incandescent bulbs, but they still consume electricity whenever they are on.

Even the most efficient lighting technology can contribute to unnecessary costs if lights are regularly left on in empty rooms. Turning off lights when they are not needed reduces operating time and lowers electricity consumption.

Other daily strategies to reduce lighting costs include:

• Using task lighting instead of illuminating an entire room
• Dimming lights when full brightness is unnecessary
• Opening blinds to use natural daylight
• Arranging work areas near windows
• Using timers or motion sensors where lights are frequently left on

Efficient technology and thoughtful behavior work together. LEDs reduce the amount of electricity used per hour, while better habits reduce the number of hours electricity is consumed.

Do Smart Bulbs Reduce Lighting Costs?

Smart bulbs can help control lighting through schedules, apps, or voice assistants. They may be useful in areas where lights are commonly left on unintentionally.

However, smart features also require electricity. If household members already turn lights off consistently, smart bulb technology may not be necessary solely for energy savings.

Timers and motion sensors can also help reduce unnecessary lighting, particularly in hallways and outdoor spaces.

The value of automation depends on how your household currently uses its lights. Automation is most helpful when it corrects habits that regularly result in unnecessary operating time.

Frequently Asked Questions

How much does home lighting cost per year?

Lighting accounted for approximately $92 of the average US home’s energy costs in 2020. At 2025 electricity rates, the estimated average was closer to $120 per year and could exceed $270 in areas with expensive electricity.

How much does it cost to operate one incandescent bulb?

A 60-watt incandescent used for five hours per day at an electricity rate of $0.20 per kilowatt-hour costs approximately $22 per year to operate.

How much does it cost to operate one LED bulb?

A 9-watt LED used for five hours per day at an electricity rate of $0.20 per kilowatt-hour costs just over $3 per year to operate.

How much can switching to an LED save?

In the 60-watt incandescent versus 9-watt LED example, switching to the LED reduces annual operating costs by approximately 85%. Actual savings depend on bulb wattage, operating time, and electricity rates.

Why are LEDs cheaper over time?

LEDs use less electricity and last longer. A standard LED can last more than 25,000 hours, compared with 1,000 to 2,000 hours for a standard incandescent bulb.

Should I replace rarely used bulbs?

Frequently used incandescent bulbs generally offer a greater opportunity for savings because they combine high wattage with long operating times. Bulbs that remain on for several hours per day are a logical place to begin.

Does turning lights off still save money if they are LEDs?

Yes. LEDs are efficient, but reducing the number of hours they operate will still lower electricity use and costs.

Key Takeaways

• Lighting accounted for approximately 5% of the average US home’s energy costs in 2020.
• Average lighting energy costs were about $92 per year in 2020 and closer to $120 at 2025 electricity rates.
• Annual lighting costs could exceed $270 in areas with expensive electricity.
• Lighting costs depend on bulb wattage, operating time, number of bulbs, and electricity rates.
• A 60-watt incandescent used for five hours per day costs approximately $22 per year at an electricity rate of $0.20 per kilowatt-hour.
• A 9-watt LED performing a similar function costs just over $3 per year under the same conditions.
• Replacing that incandescent bulb with the LED reduces operating costs by approximately 85%.
• LEDs typically last more than 25,000 hours, compared with 1,000 to 2,000 hours for incandescent bulbs.
• Frequently used incandescent bulbs generally offer the greatest opportunity for immediate savings.
• Switching to LEDs, turning off unnecessary lights, and using natural light can work together to lower household lighting expenses.

This blog focuses specifically on household lighting costs and potential LED savings. For a more comprehensive overview of lighting technology, bulb selection, placement, and energy-saving strategies, read our Complete Guide to Lighting.

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