Household lights typically add about $5-$25 per month to an electric bill, depending on the number of bulbs, wattage, and hours of use. At an illustrative U.S. electricity rate of $0.16 per kilowatt-hour (kWh), one 9-watt LED used five hours a day costs about $0.22 per month, while an equivalent 60-watt incandescent costs about $1.44.
LED wattage and daily use drive the largest differences in lighting electricity cost. Actual rates vary by utility and location, so the estimates below show how to adjust the budget to local prices.
| Item | Low | Average | High | Notes |
|---|---|---|---|---|
| One LED bulb, monthly | $0.10 | $0.22 | $0.43 | 9 watts, five hours daily, at $0.08-$0.32/kWh |
| One incandescent bulb, monthly | $0.58 | $1.44 | $2.88 | 60 watts, five hours daily, same rate range |
| Typical home lighting, monthly | $5 | $14 | $35 | About 20-40 regularly used fixtures; use and rates vary |
| Typical home lighting, yearly | $60 | $168 | $420 | Monthly estimate multiplied by 12 |
What a Home Usually Pays to Power Its Lights
A household using 20 LED bulbs averaging 9 watts for five hours a day consumes about 27 kWh monthly. At $0.16 per kWh, that is roughly $4.32 in energy charges. More fixtures, longer operating hours, decorative lighting, and higher local electricity rates can push the total substantially higher.
A practical planning range for everyday residential lighting is around $5-$25 per month, or $60-$300 per year, for a home primarily using LEDs. Homes with many lights left on, extensive outdoor lighting, or older high-wattage bulbs may reach $35 or more monthly. This estimate covers electricity, not bulb purchases or installation.
For a home using LEDs, a reasonable starting budget is about $14 monthly, with actual charges determined by fixture count and usage.
Assumptions: 20-40 commonly used fixtures, mostly 7-12-watt LEDs, three to six hours of use daily, and a $0.16/kWh electricity rate.
How Wattage and Hours Shape Each Bulb’s Electric Bill
Electricity cost is calculated from power use, time, and the utility’s price per kWh. Multiply bulb watts by hours used, divide by 1,000 to get kWh, then multiply by the rate. For a monthly estimate, multiply daily use by 30. A 9-watt LED running five hours daily uses 1.35 kWh a month.
At $0.16/kWh, that LED costs about $0.22 monthly; a 60-watt incandescent used the same way costs about $1.44. The incandescent uses about 6.7 times as much electricity in this comparison.
| Bulb type and power | Monthly use at five hours daily | Cost at $0.16/kWh | Cost at $0.32/kWh |
|---|---|---|---|
| LED, 9 watts | 1.35 kWh | $0.22 | $0.43 |
| CFL, 14 watts | 2.10 kWh | $0.34 | $0.67 |
| Halogen, 43 watts | 6.45 kWh | $1.03 | $2.06 |
| Incandescent, 60 watts | 9.00 kWh | $1.44 | $2.88 |
These figures estimate energy alone. A fixture with multiple bulbs multiplies the result by its bulb count. For example, a five-bulb chandelier with 9-watt LEDs used five hours daily costs about $1.08 monthly at $0.16/kWh, before any utility fees or taxes tied to energy use.
What Appears in a Lighting Cost Estimate
For lighting electricity, the main expense is the kWh charge. A bill may also include delivery charges, utility fees, or taxes; some are fixed monthly amounts and do not fall when lights use less power. Replacing bulbs adds a separate purchase cost, but it is not part of the electricity calculation.
| Cost item | Typical range | How it affects the estimate | Example |
|---|---|---|---|
| Energy used | $0.08-$0.32/kWh | Applied to lighting kWh | 27 kWh × $0.16 = $4.32 |
| LED bulb purchase | $2-$8 per bulb | One-time replacement expense | 10 bulbs may cost $20-$80 |
| Incandescent bulb purchase | $1-$3 per bulb | Lower upfront cost, more frequent replacement | 10 bulbs may cost $10-$30 |
| Electrician labor | $75-$150 per hour | Applies to wiring or fixture work, not ordinary bulb swaps | Fixture installation may take 1-3 hours |
For a standard bulb change, electricity is the ongoing cost; electrician labor generally matters only when the fixture, wiring, or controls need work. Utility bill delivery charges should not all be counted as lighting costs because many remain unchanged regardless of bulb use.
Assumptions: U.S. retail bulb prices and common electrician rates; local labor minimums, fixture complexity, and service-call fees can differ.
Which Bulb Wattage and Daily Hours Change the Price?
Wattage and run time are the most direct cost drivers. At $0.16/kWh, a 9-watt LED used three hours a day costs about $0.13 monthly; used 12 hours daily, it costs about $0.52. A 60-watt incandescent under those same schedules costs roughly $0.86 and $3.46 per month, respectively.
The number of bulbs matters just as much. Ten 9-watt LEDs used five hours daily cost about $2.16 monthly at $0.16/kWh; 40 such bulbs cost about $8.64. For a 60-watt bulb, the same 10- and 40-bulb setups cost about $14.40 and $57.60 monthly.
Moving from five to 10 hours of daily use doubles energy cost, while moving from 9 watts to 60 watts multiplies it by about 6.7. A dimmer may lower consumption when compatible bulbs are used at reduced brightness, but the savings depend on the dimming level and device design.
Assumptions: 30-day month and constant $0.16/kWh rate; actual usage may vary by season, room, and occupancy.
Why Lighting Bills Differ Across U.S. Regions
Electricity rates vary widely across states, utilities, and rate plans. A useful comparison is the same 9-watt LED used five hours a day: it uses 1.35 kWh monthly and costs $0.11 at $0.08/kWh, $0.22 at $0.16/kWh, and $0.43 at $0.32/kWh. The high-rate example is four times the low-rate cost for identical use.
Regional differences also reflect more than the per-kWh rate. Some households face seasonal time-of-use pricing, where electricity costs more during peak hours. Outdoor lighting may run longer in winter, while longer summer evenings can increase patio and landscape light use. The local utility bill is the best source for the applicable energy rate.
Use the household’s actual price per kWh rather than a national average to estimate lighting charges. If a bill lists separate supply and delivery rates that vary with usage, add the variable charges before calculating. Do not add fixed monthly service fees to a bulb’s cost unless estimating the whole bill.
Assumptions: Rate examples are illustrative, not state-specific quotes; utility tariffs and taxes change by service area.
Three Everyday Lighting Setups With Monthly Totals
These examples show how fixture count and operating hours combine. Each assumes $0.16/kWh and excludes the fixed portion of the electric bill. An individual fixture may contain multiple bulbs, so count every lamp separately.
| Setup | Use calculation | Monthly electricity cost | Annual estimate |
|---|---|---|---|
| Eight LED bulbs, 9 watts | 5 hours daily; 10.8 kWh/month | $1.73 | $20.74 |
| Twenty-five LED bulbs, 9 watts | 5 hours daily; 33.75 kWh/month | $5.40 | $64.80 |
| Twenty-five mixed incandescent bulbs, 60 watts | 5 hours daily; 225 kWh/month | $36.00 | $432.00 |
For a room-by-room estimate, list each bulb’s wattage and the hours it is usually on. Multiply each wattage by its daily hours, add the results, divide by 1,000, and multiply by 30 and the electricity rate. This approach captures high-use kitchens, hallways, or porch fixtures that a simple bulb count misses.
A modest number of high-wattage bulbs can cost more than a larger group of LEDs. The examples are energy estimates, not promises of exact bill changes; utility billing periods and rate structures affect actual totals.
LEDs Compared With Incandescent and Halogen Bulbs
LEDs usually have the lowest operating cost when compared at similar brightness. A 9-watt LED can provide light comparable to a 60-watt incandescent, although brightness and color quality vary by product. At five hours daily and $0.16/kWh, the LED costs about $0.22 monthly, versus $1.44 for the incandescent and about $1.03 for a 43-watt halogen.
The higher purchase price of an LED can be offset by lower energy use and fewer replacements. If an LED costs $4 and an incandescent costs $1.50, the upfront difference is $2.50. The example’s monthly electricity savings are about $1.22, so the difference could be recovered in roughly two months at five hours of daily use, before considering replacement frequency.
LEDs are particularly cost-effective in fixtures used several hours a day; in rarely used sockets, the payback takes longer. Check fixture compatibility, dimmer requirements, enclosed-fixture ratings, and the bulb’s brightness before replacing a specialty lamp.
Assumptions: Comparable light output, $0.16/kWh, and example bulb prices; product life and actual savings vary by model and use.
Lower Lighting Costs Without Replacing Every Fixture
Start with bulbs that stay on longest, such as kitchen, living-room, garage, and exterior lights. Replacing those first can reduce more electricity use than changing bulbs in seldom-used closets. Turning off lights in empty rooms helps, especially with high-wattage bulbs, while timers or occupancy sensors can reduce avoidable outdoor or hallway use.
Choose an LED with the needed brightness rather than buying the highest-wattage option. Compare lumens for light output and watts for power use. For example, replacing a 60-watt incandescent with a similarly bright 9-watt LED cuts the bulb’s electricity use by about 85%, assuming equal operating hours.
Prioritize high-use, high-wattage bulbs and verify brightness before buying replacements. Avoid paying for smart bulbs or controls unless their scheduling features will meaningfully reduce run time. For a large retrofit, compare the bulb purchase total with the expected monthly energy savings using the home’s actual rate.
Assumptions: Existing fixtures accept standard replacement bulbs; specialty bases, enclosed fixtures, and dimmers may require compatible LED models.