Energy Efficient Grow Lights: How Do They Work?

There are several types of grow lights that can be used for greenhouses or indoor gardens. There are those that take a lot of energy thus leading to higher electricity bills, but there are also energy efficient grow lights that will help you maintain a low electricity bill.

Grow lights have been used by a lot of people to imitate the effect of the rays of the sun. Grow lights systems for some people are a huge deal that they even allot a huge space on top of the growing space.

However, this practice can also lead to your grow lights consuming much energy and, at the same time, fluctuating the flow of electricity that will eventually raise your electric bill. That is why some people look for energy efficient grow lights that not only utilize energy properly but also save electricity.

In this article, we are going to discuss how the grow lights use energy and determine the energy efficient grow lights. Read on to find out which grow lights are the best ones for your low electric bill goals.

How to Compute the Energy Consumption of Grow Lights

To determine if you have energy efficient grow lights or not, you need to know how to compute the electricity usage of each light. Here is the general computation based on kilowatt hour:

  • First off, you need to know how much your electric company charges you every month. This amount is usually listed on your electric bill.
  • Next, you need to check your light fixtures specifically the bulbs and their corresponding wattages.
  • You have to sum up all the wattages of each bulb.
  • Take the sum of the wattages and divide that by 1000. You are doing this since you have to convert the watts to kilowatts.
  • After getting the result, you multiply it to the rate in your electric bill.
  • The result will be the cost of your grow lights when they are on for an hour.
  • You can then multiply this result by the number of hours you want to use it in a day.
  • The final result is the average amount your grow lights produce in a day.

Here is an example of the computation.

  • Let us say; we are charged $0.5 kilowatts per hour.
  • We have two bulbs that have 10 watts of grow lights each. All in all, we have 20 watts (two bulbs x 10 watts)
  • Dividing 20 watts by 1000, we now have 0.02 watts.
  • We then multiply 0.02 watts with the electric rate which is $0.5 kilowatts per hour. The result is $0.01 per hour. Meaning, our grow lights consume $0.01 per hour.
  • Let us say we are going to use our grow lights for 10 hours. We will then multiply $0.01 per hour by 10 which results to $0.1.
  • So when your grow lights are open for 10 hours a day, you have to pay $0.1 which totals to $3 a month.

Now you know how to compute how much your grow lights will cost when it comes to electricity, you can now gauge if they are energy efficient grow lights. Of course, that will depend on your budget and how much you would want to spend on your lights and indoor garden.

Types of Grow Lights with Energy Consumption

Here are three main types of grow lights with their corresponding general wattages:

Fluorescent Grow Lights

These lights are less intense compared to other grow lights since they only come in one color which can either change in temperature. They come in full spectrum, cool, and warm. These are used to supplement natural light so even though they save energy, you can only grow a limited type of plant with this light.

They have an average of 40-100 watts.

High-Intensity Discharge Grow Lights (HID Grow Lights)

The bulbs of these lights pass through a tube that is ceramic that also has mixtures of gases. The blend of these gases will indicate the color that will show in the light. These lights are twice stronger than fluorescent lights. These lights require a special set up as they need ballasts for their fixtures.

They have an average of 400-1000 watts.

Light Emitting Diode Grow Lights (LED Grow Lights)

This type of grow light is the popular choice since the lights are very customizable since there are a lot of color options. Generally, this type of light consumes less electricity, but at the same time, it still provides proper lighting to your indoor plants. They are also very easy to maintain and to set up.

They have an average of 40-100 watts. The wattages that are mentioned are just default estimates. The computation will change based on how many lights there are and the growing space of your indoor garden.

Summary: The Best Energy Efficient Grow Lights

If you are someone who wants to conserve on energy and electricity but also want to have a very efficient grow light, then we suggest going for Light Emitting Diode Grow Lights (LED Grow Lights). As we have discussed before, they do not have high wattages but their types of light will also benefit your plants.

Usually, these LED Grow Lights do not run at high temperature, so you are assured that they will not overheat and will not affect your current electric bill so much.

At the same time, they are user-friendly and very easy to customize. They have different colored bulbs for specific plant needs. Also, they can be set up easily, no need for permanent fixtures or ballasts.

These LED Grow Lights might just be more expensive than the other grow lights mentioned in our list, but in the long run, you will save more money as these lights do not consume too much energy and electricity. They use whatever small amount of electricity they get and project it brightly onto your plants without much energy wastage.

No more bad surprises in the electric bill for you.

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James Alexander James Alexander
Hey, I'm James! The founder and head writer here at I started this site to share my passion and knowledge of all things cannabis. I used to work as a budtender in central Amsterdam, and have over 7 years of growing experience.

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