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Fluorescent bulb power consumption and electricity cost
- Last Updated: February 21, 2023
Fluorescent bulbs are energy-efficient lighting that consume significantly less power than traditional incandescent bulbs.
The power consumption of a fluorescent bulb depends on its wattage rating, which can range from 5 watts for small bulbs to 100 watts for large ones.
A typical fluorescent bulb consumes about 13-15 watts of power.
The cost of electricity used by a fluorescent bulb depends on several factors, including the wattage of the bulb, the number of hours it is used, and the electricity rate charged by the utility company.
TABLE OF CONTENTS – QUICK NAVIGATION
1. How much power does a fluorescent bulb use
1.1. Light bulbs conversion table
2. Fluorescent bulb electricity cost calculator
2.1 How much does electricity cost
2.2. Home appliances and devices electricity calculators
3. How to lower the home lighting electricity bill
4. Fluorescent bulb electricity usage FAQ
4.1. How many watts does a fluorescent light use
4.2. How much energy does a fluorescent light bulb use
4.3. Do fluorescent lights use more electricity
4.4. Is it true that there is mercury inside the florescent light bulbs
4.5. How should I dispose fluorescent light bulbs
4.6. What should I do if a fluorescent light bulb breaks at home
5. Electricity measurement units: Watt (W), Kilowatt (kW) and Kilowatt hour (kWh)
5.1. Electricity measurement units calculators
6. Home lighting and energy conservation
How much power does a fluorescent bulb use
As shown as the picture below, fluorescent light bulbs (e.g. CFL light bulbs) are much more efficient than traditional light bulbs but less efficient than LED light bulbs.
Under the same conditions and when compared to a LED light bulb:
> A CFL light bulb will use around 75% more electricity
> An incandescent bulb will use around 625% more electricity.
For a better perspective, the table below shows the power consumption of equivalent light bulbs and their brightness in lumens.
Light bulbs conversion tables
Additionally, this other table also provides valuable information:
> Light bulb energy efficiency: How efficient the light bulb is
> Light bulb lifespan: An approximation on how many hours the bulb will last before having to change it
> Light bulb electricity yearly cost: An approximation on the yearly electricity cost.
Fluorescent bulb electricity cost calculator
The calculator below can estimate the power consumption and the electricity cost of CFL light bulbs over time.
You need to adjust the values in the PARAMETERS section to your requirements, and the calculator will automatically display the RESULTS section.
For example, if you have 8 CFL light bulbs at home that:
> Have a power rating of 7 Watts (W)
> Are switched on 6 hours a day and 320 days per year
> You are paying 0,217 euros (or dollars or pounds) per every kWh you consume
You will be paying around 23 euros (or dollars, or pounds, or…) per year in electricity costs to power up those 8 CFL light bulbs.
How much does electricity cost
If you don’t know how much you are paying per kWh, you should be able to find the cost per kWh on your electricity contract or in one of the electricity bills.
Alternatively, if you don’t have access to your contract or electricity bills, this website shows the electricity cost per country.
Home appliances and devices electricity calculators
A few other examples from our ‘Electricity usage and electricity cost calculators‘ page that may be of your interest:
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How to lower the home lighting electricity bill
Apart from choosing the most efficient light bulb for your need, here there is some advice that can help you with reducing your lighting bill:
1.- If possible, use transparent shades or fittings.
This is because the dark lampshade can absorb some of the light that a light bulb emits.
2.- Clean your shades and fittings
Dust accumulation will prevent efficient light distribution.
3.- Choose the right color
‘Soft white’ or ‘warm white light bulbs provide a homey glow that is best for general household lighting
‘Cool white’ or ‘pure white’ are ideal for office spaces, reading areas, or any area that requires clear vision.
If you have an office space and install the incorrect lighting, you may try to compensate by installing additional lighting like desk lamps. And this approach will become an electricity waste.
4.- Do not keep the light switched on unnecessarily
This is the most common advice, but it does really count.
Below, on the next section, you will find a calculator that should give you some insights on the importance of electricity conservation.
Even small savings may significantly impact reducing our carbon footprint and conserving our natural resources.
Fluorescent bulb electricity usage FAQ
How many watts does a fluorescent light use
There is not a direct answer to this questions.
How many watts does a fluorescent light use depends on the model and specifications.
On the ‘How much electricity does a fluorescent light bulb use’ section we provide the wattage usage for a Compact Fluorescent Light (CFL) bulb depending on the light (lumens) produced.
How much energy does a fluorescent light bulb use
Again, as on the questions above, there is not a direct answer to this questions.
How much electricity does a fluorescent light bulb use depends on the model and specifications.
On the ‘How much electricity does a fluorescent light bulb use’ section we provide the wattage usage for a Compact Fluorescent Light (CFL) bulb depending on the light (lumens) produced.
Do fluorescent lights use more electricity
They do use more electricity than LED lights but less electricity than incandescent light bulbs.
Is it true that there is mercury inside the fluorescent light bulbs
Yes, the florescent light bulbs contain a small amount of mercury sealed inside the glass tube. For example, as Wikipedia describes, a fluorescent light bulb F34T12 contains 5 milligrams of mercury.
How should I dispose florescent light bulbs
You should take the florescent light bulbs to your local hazardous waste collection points. You can probably take them to the same collection point where you take your home AAA or AA batteries.
What should I do if a florescent light bulb breaks at home
When a CFL light bulb is broken a small quantity of mercury vapor is released. But do not worry; the risk to human health is very minimal.
How to dispose of a broken CFL light bulb:
1. Open the room windows for a minimum of 15 min and make sure that children and pets are moved outside the room. Also, you should evacuate the room for 15 minutes after ensuring the air conditioner is powered off.
> Do NOT use a vacuum cleaner to pick up the broken pieces.
2. If you have them at home, use globes to collect the broken pieces and put them into a sealable bag. After collecting the broken pieces, the also place the globes into the sealable bag.
> If you don’t have globes, use a piece of cardboard or paper to collect the broken pieces
> If you don’t have a sealable bag, close an everyday bag using tape. Alternatively, you can use a jar with a lid.
3. Use a vacuum cleaner to hoover the area and afterward put the vacuum cleaner bag into a sealable bag for safe disposal.
> If the florescent light bulb have come in contact with fabrics, like clothes or a carpet, they must also be disposed of. Washing the contaminated clothes could spread the mercury to other garments.
4. Check where in your area you have a hazardous waste collection point and dispose of all the above mentioned materials.
Electricity measurement units
Not everybody is familiar with terms like Watts, Kilowatts, or Kilowatt hours, so if you would learn more about them, look at this YouTube video we have prepared about this topic.
Electricity measurement units calculators
Or you can have a look to these electricity measurement units calculators to get a better understanding of:
> What is a Watt (W) and how to transform Watts into Kilowatts
> What is a Kilowatt (kW) and how to transform Kilowatts into Kilowatts hour
> What is a Kilowatt hour (kWh) and how to transform Kilowatts hours to other units
> What are Power (P), Voltage (V), and Current (I)
Home lighting and energy conservation
Energy conservation can be defined as the decision and the act of using less energy
Energy conservation both benefit you and the environment
The act of saving and conserving electricity does benefit you because you will be paying less on your energy bills.
And it also benefits the environment because conserving electricity prevents unnecessary waste of natural resources.
At the individual level, it may not look worth trying to save a few watts here or there.
Still, every little count and if hundreds or thousands of us save a little every time, it will make an essential contribution towards conserving our natural resources.
Energy conservation calculator
Reducing the home lighting electricity usage, even a very small amount, would greatly impact preserving our natural resources.
For example, if 9000 households save as little as 10 Watts per day (0,01 kWh) on home lighting electricity usage, that would add to 32850 Kilowatt hours (kWh) saved per year.
9000 households x 0,01 kWh per day x 365 days per year
=
32,850 kWh saved per year
That is a considerable amount of electricity, but let’s add additional perspectives for clarity:
> Assuming an average cost of 0,18 euros (or dollars, pounds, or any other currency) per kWh, we would collectively save nearly 6000 euros annually.
> To produce 32,850 kWh of electricity it is necessary to use around 17 metric tons of coal or 56 barrels of residual fuel oil.
Look at this page for more information about the number of resources needed to produce electricity.
In any case it is clear that small energy savings do really count when looking into the bigger picture.
Proven ways to save electricity at home
If you are looking for ideas to save electricity at home, watch this YouTube video were we show some useful tips to reduce electricity usage at home and decrease the electricity bill.
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