Led Light Power Consumption Calculator

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LED light power consumption is very less in comparison to CFL’s. LED provide the same luminescence for significantly low wattage in comparison to CFL. 

The job of any light source is to produce high intensity bright light. Intensity of brightness produces by light is measured in Lumen.

A  single CFL and LED bulb might have the same lumen (brightness) output but the amount of energy needed to generate that same level of brightness will vary significantly in both cases.

The table below shows lumens (light intensity) and corresponding power consumption of LED, CFL & incandescent bulb to produce that much lumens.

Lumens LED (Watt) CFL (Watt) Incandescent (Watt)
400 - 500
6 - 7
8 - 12
650 - 800
7 - 10
13 - 18
1000 - 1400
11 - 13
18 - 23
1600 - 1800
16 - 20
23 - 30
2700 +
25 - 28
30 - 55

Clearly you can see that a LED requires quite less power to produce the same lumens.

To use the LED light power consumption calculator to calculate the power consumption of your LED bulb, tube light and interpret the results correctly you should understand the following terms.

If you know these terms then feel free to scroll down to use the LED light power consumption calculator.

  • What is Watt (W) – Watt is a unit of power. It means the rate at which electricity is consumed or produced by a device. For example a 10 watt light bulb consumes power at a rate of 10 watts per hour, it does not mean that the light bulb consumed 10 units of electricity, it means it will consume power at a rate of 10 watts every hour.
  • What is Kilowatt (kW) – Kilowatt is also a unit of power. Kilowatt (KW) is used for large devices that consume more power. For example a 1.5 kW air conditioner, 6 kW elevator. There are bigger units like Megawatt (MW), Gigawatt (GW) to describe large power consumption or generation. For example 100 Megawatt (MW) coal power plant.(1 kW = 1000 W)
  • What is a Kilowatt hour (kWh) – Units as described in electricity bill a.k.a kilowatt hour is the energy consumption of a device. For example a 20 watt LED bulb running for 50 hours will consume 20 watt x 50 hours = 1000 watt hours = 1 kilowatt hour of electricity = 1 unit of electricity.(1 kWh of electricity = 1 unit of electricity)
  • Electricity Tariff – Electricity tariff is the amount the electricity provider charges you for one unit (kWh) of electricity. I live in Mumbai, India here the electricity tariff is Rs 12/kWh. If you don’t know how to calculate your tariff then just divide your total bill by monthly power consumption and you will get your electricity tariff.
  • What is operational hours – Operational hours of a device refers to how many hours the device is working. If you run your television for 3 hours then operational hours of your television is 3 hours.

To calculate the power consumption of your Light bulb be it LED, CFL or any other type just put the wattage, operational hours and electricity tariff in the below calculator and you will get the power consumption of your LED light and the electricity bill you will get for using it.

You can use the above chart to find out your LED wattage or go to amazon and search for your LED and read the product description.

LED Light Power Consumption Calculator:​

LED VS CFL Power Consumption:

Here I have taken a 18 watt CFL which gives 1000 lumens and compared it with a 12 watt LED which also gives 1000 lumens to give you a rough estimate on power consumption of LED & CFL.

To produce 1000 lumens a CFL requires 22 watts whereas a LED requires just 12 watts.

For the below calculation I have assumed the electricity tariff is Rs 10.

LED Vs CFL Light Power Consumption:​

Wattage For 1100 Lumens (W)
18 watt
12 watt
Life in hours
6,000 hours
15,000 hours
Price (Rs)
Rs 150
Rs 185
Power Consumed in 8 hours operation (Watt X 8) (P8)
144 watt.hr
96 watt.hr
Monthly Power Consumption (P8 X 30) (M)
4.32 kWh
2.88 kWh
Monthly Electricity Bill (Rs) (M X 10)
Rs 43
Rs 29
Annual Power Consumption (P8 X 12) (A)
51.84 kWh
34.56 kWh
Yearly Electricity Bill (Rs) (A X 10)
Rs 518
Rs 345

As you can see from the above table the annual power consumption of a 18 watt CFL which gives 1000 lumens intensity is 51.84 kWh whereas a 12 Watt LED which gives same 1000 lumens only consumes 34.56 kWh of electricity.

The difference in price isn’t much either, In today’s time it is best you opt for a LED light because they aren’t much expensive when compared to CFL’s and there power consumption is very low.

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