Wiktor Wise
Lights consume electricity, but the amount varies depending on the type of light bulb and how long it is left on for. While individual light bulbs don't use a lot of energy, the costs can quickly add up if multiple lights are left on for extended periods. The type of light bulb also makes a difference, with LED bulbs being the most energy-efficient, followed by fluorescent and incandescent bulbs. Incandescent bulbs, in particular, are known for their high energy consumption and heat loss, with nearly 90% of energy wasted as heat. Therefore, it is important to consider energy-saving options when choosing light bulbs and to be mindful of turning off lights when not in use to reduce electricity consumption and lower energy bills.
| Characteristics | Values |
|---|---|
| Whether lights consume a lot of electricity | It depends on the type of light and how many are being used. |
| Types of light bulbs | Incandescent, fluorescent, or LED |
| Most common type of light bulb | Incandescent |
| Least energy-efficient type of light bulb | Incandescent |
| Average wattage of incandescent light bulbs | 60 W |
| Average wattage of LED light bulbs | 10 W |
| Average electricity price in the U.S. as of October 2023 | $0.17 per kWh |
| Average cost of running an incandescent light bulb for a year | $43.8 kWh/year |
| Average cost of running an LED light bulb for a year | $7.3 kWh/year |
| Average cost of running an LED light bulb for 2 hours a day | $0.21-$0.26 monthly |
| Average cost of running an LED light bulb for 3 hours a day | $0.92 monthly |
| Average number of light bulbs in a U.S. household | 45 |
| Average cost of leaving one incandescent light bulb on for a night | $2.5 |
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What You'll Learn
The type of light bulb used matters
The most common types of household light bulbs are incandescent, fluorescent, and LED. While incandescent bulbs are a common choice due to their low upfront cost, they are the least energy-efficient. Incandescent bulbs waste nearly 90% of their energy as heat, with only about 5% being converted to visible light. This makes them a fire hazard as they are prone to overheating. Additionally, the Biden administration has implemented legislation that effectively bans the sale of incandescent bulbs that do not meet new federal efficiency standards.
On the other hand, LED bulbs are known for their energy efficiency, using only about 10 watts of power and lasting up to 50 times longer than incandescent bulbs. They also emit less heat, reducing the need for air conditioning and further saving energy. LED bulbs are a more cost-effective option, with a 9-watt LED bulb costing only $3 for a year's worth of use compared to a 60-watt incandescent bulb, which costs about $20 for the same period.
The number of light bulbs in use also contributes to energy consumption. The average U.S. household has about 40 to 45 light bulbs, and leaving them all on for an extended period can significantly impact energy costs. For example, 45 incandescent bulbs left on for seven hours at 12 cents per kilowatt-hour would cost approximately $2.50.
Therefore, switching to more energy-efficient options like LED bulbs and being mindful of the number of lights in use can help reduce electricity consumption and lower energy bills.
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How much electricity do light bulbs use?
The amount of electricity consumed by light bulbs depends on several factors, including the type of bulb, wattage, usage time, and the number of bulbs. Traditional incandescent bulbs typically use more electricity, ranging from 25 to 100 watts, while LED bulbs are more energy-efficient, ranging from 2 to 18 watts.
Let's consider a common scenario with a 60-watt incandescent bulb. If you leave this bulb on for an hour, it consumes 0.06 kilowatt-hours (kWh) of electricity. Over a month, assuming an average usage of 8 hours per day, it would consume 14.4 kWh. At an electricity rate of $0.20/kWh, this would cost you approximately $2.88 per month.
Now, let's compare this to an LED bulb. A typical LED bulb uses around 10 watts. If you use it for 2 hours a day, it will consume 0.61 kWh per month and 7.30 kWh per year. At the same electricity rate of $0.20/kWh, the monthly cost for this LED bulb would be significantly lower, at around $0.12.
It's important to remember that these calculations are for individual bulbs. Most homes have multiple light bulbs, so the total electricity consumption and cost will be higher. Additionally, electricity rates can vary by region, so your actual cost may differ from the example provided.
To estimate your overall lighting costs, you can calculate the total wattage of all your bulbs, consider their average daily usage, and apply the electricity rate in your area. This will give you a more comprehensive understanding of the electricity consumption and costs associated with your lighting choices.
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How to calculate the cost of lighting
The cost of lighting depends on several factors, including the type of light bulb, wattage, hours of usage, and electricity rates. Here is a step-by-step guide on how to calculate the cost of lighting:
Step 1: Determine the Type of Light Bulb
The type of light bulb you use plays a significant role in determining the cost. Different types of bulbs, such as incandescent, fluorescent, or LED, have varying levels of energy efficiency. For example, LED bulbs are known for their energy efficiency and can help reduce overall lighting costs. On the other hand, incandescent bulbs tend to waste energy as heat, with only about 5% being converted into visible light.
Step 2: Identify the Wattage
Wattage represents the amount of energy consumed by the light bulb. You can usually find this information on the bulb itself or in the product specifications. It is measured in watts (W) or kilowatts (kW). A typical incandescent bulb may have a wattage of 60 W, while an LED bulb might have a lower wattage, such as 10 W.
Step 3: Calculate the Kilowatt-Hours (kWh)
To calculate the kWh, multiply the wattage of the bulb by the number of hours it is used per day. Then, divide this number by 1000. For example, if you have a 60 W bulb and use it for 5 hours a day:
> 60 W x 5 hours = 300 W-hours
> 300 W-hours / 1000 = 0.3 kWh
Step 4: Determine the Electricity Rate
Electricity rates vary depending on your location and electricity provider. You can find the exact rate on your electric bill. It is typically measured in cents per kilowatt-hour. For example, the standard energy tariff in Texas is 12 cents per kilowatt-hour.
Step 5: Calculate the Cost
Finally, to calculate the daily cost of using the light bulb, multiply the kWh from Step 3 by the electricity rate from Step 4. For example, if your electricity rate is 12 cents per kilowatt-hour:
> 0.3 kWh x $0.12 = $0.036 per day
To calculate the monthly cost, multiply the daily cost by 30, and to calculate the annual cost, multiply the daily cost by 365.
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The pros and cons of different light bulbs
The type of light bulb you use can have a significant impact on your electricity bill. While individual light bulbs may not use a lot of energy, the costs can quickly add up, especially if you have multiple bulbs in your home. Here are the pros and cons of some of the most common types of light bulbs:
Incandescent Light Bulbs
Incandescent light bulbs are the oldest type of light bulb and work by heating a filament with electricity until it becomes hot enough to shine. They produce a pleasant yellow light that can add a comfortable and atmospheric touch to any room. They are also commonly used in museums due to their low ultraviolet radiation, which reduces their negative impact on paintings and exhibits.
Pros:
- They are cheap, effective, and produce high-quality light.
- They have a long history and are the most common light source in residential applications.
- They are versatile and can be used for table lamps, chandeliers, and ceiling fixtures.
- They distribute light in all directions, providing general illumination.
Cons:
- They waste a lot of energy as most of the electricity used escapes in the form of heat.
- They can become fire hazards due to overheating.
- They have a shorter lifespan compared to other types of bulbs, lasting up to 2,000 hours.
- They are fragile and prone to burning out frequently.
- The fixture must be heat-resistant due to the high temperatures reached by the bulb.
LED Light Bulbs
LED (Light-Emitting Diode) light bulbs are known for their energy efficiency, using approximately 90% less energy than incandescent lights. They have a significantly longer lifespan, with some tests showing they can last up to 50,000 hours or more.
Pros:
- They are highly energy-efficient, resulting in lower electricity costs.
- They have a long lifespan, reducing the need for frequent replacements.
- They produce minimal heat, with 80% light and only 20% heat output.
- They are available in different colours and dimmable options, offering versatility in lighting effects.
Cons:
- They are not compatible with traditional dimmers and require specific switches for dimming.
- They can overheat if exposed to external heat sources and should be protected with a lampshade or sconce.
- They may not be suitable for lighting trade showcases as they can distort the colour of products.
Fluorescent Light Bulbs
Fluorescent light bulbs first emerged in the 1960s as an energy-efficient alternative to incandescent bulbs. While they have improved over time, they still may not offer the same light quality as incandescent bulbs.
Pros:
- They are more energy-efficient than most incandescent light sources.
- They have improved colour temperature, reducing the sickly blue-green hue associated with earlier fluorescent bulbs.
- They no longer produce an audible hum, thanks to advancements in ballast technology.
Cons:
- They may not provide the same broad-range light quality as the best incandescent bulbs.
- They are not typically dimmable, and "dimmable" options tend to be more expensive.
- They may not be suitable for certain installations, as installing them upside down can shorten their lifespan.
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How to save money on lighting
While individual light bulbs may not use a lot of energy, the costs can quickly add up, especially if you leave multiple lights on when you're not home. The average US household has 45 light bulbs, so it's important to be mindful of your energy usage.
One way to save money on lighting is to switch to energy-efficient light bulbs, such as LEDs (light-emitting diodes) or CFLs. LEDs are up to 90% more efficient than incandescent lights and last a long time, making them a cost-effective option despite their higher upfront cost. They also have very low energy use and are available to fit almost every light fitting. CFLs are another energy-efficient option, and they perform well in cold climates.
If you have outdoor lighting that is left on for long periods, using LEDs or CFLs can result in significant energy savings. Look for ENERGY STAR-qualified fixtures with features like automatic daylight shut-off and motion sensors to further enhance your energy savings.
Another way to save money on lighting is to use controls such as timers and dimmers. Timers automatically turn lights off when not in use, while dimmers allow you to lower the wattage and illumination, reducing energy consumption. Motion sensors can also be used to detect whether someone is present in an area and switch on lights accordingly, preventing lights from being left on unnecessarily.
Finally, take advantage of natural light whenever possible. Letting sunlight into your home is a cost-free way to brighten up your space and reduce your reliance on artificial lighting.
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Frequently asked questions
It depends on the type of light bulb and how many you have on. LED lights are the most energy-efficient, with a 9-watt LED bulb costing $3 for a year's worth of use. A comparable 60-watt incandescent bulb costs about $20 a year. On average, a 60-watt incandescent bulb uses 0.06 kWh if it's on for an hour.
Assuming you have 30 60-watt incandescent lightbulbs and you're paying the standard energy tariff of 12 cents per kilowatt-hour, leaving the lights on all day will cost you $5.2 a day.
You can reduce the energy consumed by investing in LEDs (light-emitting diodes) which are approximately 90% more efficient than incandescent lights.
