Power consumption & Energy usage of CFL lamps

CFL lamps or compact fluorescent lights are made to make lighting more energy efficient. It started replacing the incandescent lights. It was invented by Edward Hammer in 1980 who was an Engineer in GE. The power consumption of CFL ranges from 10 watts to 50 watts depending on its extraction rate.

Enter the wattage, hours of usage and cost per kWh. The energy usage calculator for CFL gives you the total energy consumed by the CFL. Also, you can find how much power do CFL lights use. To check the current electricity price per kWh in your region refer to Global Electricity rates. It is necessary to enter the right cost per unit(kWh) to find the exact price.

Energy usage of CFL

Average usage hours per day:
Cost per unit*:(Global Electricity rates)
Electricity usage per hour:
Electricity usage per day:
Usage cost per hour:
Usage cost per day:
Usage cost per month:
Usage cost per year:
*The cost is currency independent and same that of cost per unit input given.

Lumens-wattage of CFL lamps

LumensTypical CFL Watts 
<90015 – 18W
<120012 – 13W
<175014 – 20W
2600+25 – 28W

Terms and definitions:


Power usage of device in watts as mentioned in the label of the lamp.

Cost per unit:

The average cost per unit charged by the electric utility. Every country has different tariff rates. Visit: Global Electricity prices for details if you don’t know how much the utility company charges you per unit or kWH.

Units per day:

The number of units of electricity consumed by the load every day considering the entered operation hours.

Hours of usage:

Number of hours the load is used per day.

The electricity usage depends on the wattage, number of hours of usage. The utility company charges you for the total number of kilo-watt-hour of energy you have consumed. Kilowatt-hour is the product of power consumption of the load and the number of hours of usage.

Power consumption & Energy usage of CFL lamps

Replacing incandescent bulbs with CFL can help you cut down your energy usage costs by 40 per cent. They can last up to 9 times longer than incandescent bulbs.

In compact fluorescent lights, the current is driven through a gas chamber filled with argon and mercury vapours to generate ultraviolet rays. This ultraviolet ray falls on the phosphor coating on the interior of the gas chamber which emits visible light.

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