Electricity usage of a CFL Light Bulb

A CFL light bulb is also known as a compact fluorescent lamp or a compact fluorescent light, they were made to replace incandescent light bulbs. CFLs use 1/3rd to 1/5th the electrical power of incandescent lighting and can last 8 to 15 times longer. An average CFL bulb which provides 800 lumens will use only 13 to 15 watts compared to a similar incandescent bulb which uses 60 watts.

Click calculate to find out the electricity cost of a single CFL light bulb running at 14 watts per hour for 5 hours a day @ $0.10 per a kWh, you can also modify the calculator.

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Hours Used Per Day: Enter how many hours the device is being used on average per a day, if the power consumption is lower than 1 hour per a day enter as a decimal. (For example: 30 minutes per a day is 0.5)
Power Use (Watts): Enter the average per hour power consumption of the device in watts.
Price (kWh): Enter the cost you are paying on average per a kilowatt hour, average price in North America is 10 cents. To find an exact price check your electricity bill or take a look at Global Electricity Prices.

Comparison Between LED, CFL and Incandescent Light Bulbs:

Lifespan in hours50,0009,0001,000
Watts (equivalent 60 watts)81460
Cost per a bulb$20$3$1.25
Daily cost*$0.004$0.007$0.03
Annual cost*$1.46$2.56$10.95
Cost for 50k hours @ $0.10 kWh$39.58$70.83$300
Bulbs needed for 50k hours15.550
Total cost for 50k hours with bulb price$59.58$87.30$362.50
* Assuming 5 hours a day @ $0.10 per a kWh.

If you are still using incandescent lights we highly recommend you switch to CFL or LED lighting. CFL lights have significantly dropped in price in the past decade, they are far more energy efficient and last 8 to 15 times longer. You will save a considerable amount of money and reduce your electricity usage if you make the switch. In an effort to reduce energy use many cities or businesses may also provide discounts or free replacements in exchange for old inefficient incandescent light bulbs, check locally if such programs exists in your area.

Another lighting technology that has emerged is the LED or the light-emitting diode light bulb, the same little lights you find flickering in your small devices have now been scaled up and are becoming cheaper. An LED light bulb uses almost half the power of a CFL light bulb and can last 50 thousand hours or 5.7 years of 24/7 lighting. If you can make the initial investment for LED light bulbs you can reduce your energy consumption even further, even getting one or two LED light bulbs to place in areas where lights are constantly turned on would be a great cost and energy saving move.


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