- How much electricity does a CFL bulb use?-

A compact fluorescent lamp (CFL) is also know as compact fluorescent light or compact fluorescent tube. 

The CFLs were designed to substitute the incandescent light bulbs and for that they were made compatible with standard bulb fixtures.

But how much electricity does a CFL light bulb use and, are they more energy efficient than the traditional incandescent light bulbs?

CFL light bulb electricity usage

As shown as the picture above, the 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 be using around 75% more electricity and an incandescent bulb will be using around 625% more electricity.

The table below show the power consumption of equivalent light bulbs. And by using the calculator we have provided on the next section, anyone should be able to estimate the electricity cost of running any bulb of any wattage.

250 lumens25 W4-9 W2-3 W
450 lumens40 W9-13 W4-5 W
800 lumens60 W13-15 W6-10 W
1100 lumens75 W18-25 W10-15 W
1600 lumens100 W23-30 W15-20 W
2000 lumens125 W28-40 W20-25 W
2600 lumens15034-55 W25-28 W

Additionally, this other table also provides valuable information than anyone should consider when deciding what light bulb type to purchase.

Energy EfficiencyLOWGOODBEST
Lifespan (approx.)1200 h8000 h25000 h
Yearly Cost (approx.)2,52 €/year1,43 €/year1,11 €/year

Electricity usage and cost calculator

The calculator below can be used to calculate the power and cost consumption of CFL light bulbs over time. 

You just 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 euro (or dollars or pounds) per every kWh you consume 

You will be paying around 23 euro (or dollars, or pounds, or…) per year in electricity costs to power up those 8 CFL light bulbs.

A few other examples from our ‘Electricity usage calculators‘ page that may be of your interest:

Additional information

Not everybody it is familiar with terms like Watts, Kilowatts or Kilowatt hours so if you would like to learn more about them, have a look to this video that we have prepared for you.

All our videos can be found in YouTube, in both English and Spanish languages.

If you are looking for saving electricity at home, have a look to this video where we provide some useful tips to reduce the electricity consumption and decrease the electricity bill.

Electricity conservation - Save and conserve energy

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 does benefit the environment because conserving electricity prevents any unnecessary waste of natural resources.

Now, at individual level it may not look worth to try to save a few watts here or there. 

Still, every little counts and if hundreds or thousands of us do save a little every time, it will make an important contribution towards conserving our natural resources.


For example, if 9000 households would manage to save as little as 10 Watts per hour (0,01 kWh) worth of electricity per day, that would add to 32850 Kilowatt hour (kWh) per year. 

That is a considerable amount of electricity, but let’s add additional perspectives for clarity:

  • Assuming an average cost of 0,18 euro (or dollars, or pounds, or any other currency) we would collectively be saving nearly 6000 euro per year.
  •  To produce 32850 kWh of electricity it is necessary to use around 17 metric tons of coal or 56 barrels of residual fuel oil.
Have a look to this page for more information about the amount 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.

We hope that you have found the information on this page informative and of value. 

If so, please consider to share or subscribe to our newsletter.

We dedicate a considerable amount of time and effort to create content and your support and engagement will encourage us to keep moving forward.

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