To know how much does a light bulb consume It is very simple. To do this you only need to know a series of data that we are going to show you and perform a small calculation. In this way you will be able to know how much it would cost you to have a light bulb on all day, just for a few hours, etc. You can also calculate it to know how much that means per month or per year. You will see that not all will consume the same, as you can imagine. There are those that consume very little and others, on the other hand, much more.
What is the consumption of a light bulb on
Although it is not what is going to be consumed the most in our homes, without a doubt light bulbs they are very present and can become an important part of the bill in the sum of all. Therefore, knowing how much they consume can be interesting if we want to save energy or simply out of curiosity.
In order to calculate the consumption of a light bulb on all day you need to know some data:
- Bulb power measured in W
- hours on
- energy price
The power of a light bulb can vary quite a bit. There are the old incandescent ones or the most modern LED ones. The former can consume from 40 to 100 W, while the latter consume much less and we can see them from 4 to 15 W. There are also those with low consumption, which are somewhere between the two, although closer. of the LEDs.
Therefore, we are going to suppose that we have a 9W LED bulb. It is a common bulb that we can have in our home to light a room, for example. We are going to assume that we have it on all day, so we are going to use it 24 hours. What we do is multiply the power (9 W in this case) by the hours (24 hours in this case) and divide that by 1,000 to calculate the kWh.
In this example we get a figure of 0.216 kWh. The next thing would be to know how much each kWh costs and that will depend on the rate you have contracted, the price of energy at that time, etc. But we can put as an example €0.16 per kWh. We simply multiply it and it gives us €0.034/kWh.
In summary, a 9 W bulb that we have on 24 hours a day is going to cost us about 3 euro cents. In other words, if we have it on for a whole month, we would be paying about €1.
Number of bulbs and power, key consumption
In our example we have taken a single bulb. Logically, if you have 5 bulbs of this type in a room, the amount you are going to consume will be 5 times. If the bulbs instead of being 9 W are 15 W, for example, then the consumption will be higher and you will have to calculate it in the same way.
In short, a current LED bulb has a very low consumption. Even if you leave it on all month without turning it off, we would be talking about consuming €1 or a little more. However, if you use old bulbs you will notice a much higher consumption and in that case it will be more important to turn it off whenever you can.
