How much power does a 1000 watt hps light use?

(Last Updated On: November 14, 2021)

HPS lights are not the most power efficient grow lights out there. There are power saving alternatives such as fluorescent lights, LED lights. However, if you have decided that you want to use HPS lights only, you need to know- how much power a 1000 watt HPS light uses.

Because running HPS lights can be expensive. That is what this article is about. I will help you decide whether HPS lights are ideal for you and how much it might cost so you can make informed decisions.

What is a 1000 watt HPS light? Things to consider before buying

A 1000 watt hps light is frequently one of the most crucial elements to any indoor grower. These lights are extremely strong, and therefore very expensive! It’s important to know what you need before making a purchase; rather than finding out after that you bought too little or too much.

There is an average of 45 watts per square foot of light needed depending upon what you’re growing and how far away the plants are from the lights. You should also take into consideration your heat load when calculating wattage required.

For example; if you have 6 – 250 watt High Pressure Sodium (HPS) lamps over 20 sq ft., then you would need about 900 watts to accommodate for heat in this particular setup (20 sq ft. x 45 watts = 900 watts).

If growing organically, then you would need to add in the extra energy needed to supply nutrients and oxygen via passive ventilation or an exhaust system.

HPS (High Pressure Sodium) lights are ideal for plant growers who want to grow in a greenhouse or in an indoor growing environment. HPS lamps contain a more orange light spectrum, which is especially useful in the flowering stages of plants development.

The most commonly used commercial HPS lights are 600 watt and 1000 watt High-Pressure Sodium Grow Lights. HPS lamps are not suitable for indoor lighting in homes or offices because HPS lights release a lot of heat and use more electricity than other types of lights.

Pros and Cons of using HPS lights

As a newbie grower, I was advised to use HPS lights for my indoor garden. Of course, they also said that I should buy high-quality ones because it’s known as one of the best light sources for growing weed indoors. They’re certainly bright and they emit a red color in the spectrum which is great for photosynthesis.

Many people are and everything seems to be doing fine, but I have seen mixed reactions about HPS lights and they all seem to have pros and cons. So, is using an HPS right for you?


  • Produces high light intensity that plants need in order to grow well
  • Full spectrum light that contains red color for photosynthesis
  • Doesn’t contain infrared or ultraviolet lights that might damage your plants


  • Generates a lot of heat so you’ll need to invest in a really good cooling system too. If not, the heat could damage the plants and even kill them by burning their stems and leaves.
  • Uses a lot of electricity, so once again you’ll need to invest in the cooling system or pay for your high electricity bills.

So, is it worth all the hassle? I think that HPS lights are great if you’re growing short plants like marijuana because they can focus on one area where they will grow well.

On the other hand, large plants might get burned so be careful where you place them. If you’re planning to grow taller plants like tomatoes or cucumbers, I’d definitely recommend choosing LED instead of HPS lights.

They’re also great for cloning and seedlings because they don’t generate that much heat yet they produce light that is perfect for these plants. Their full spectrum is also great for photosynthesis and the fact that they’re not producing infrared or UV light makes them safe for your garden.

What lighting do you use? How’s it working for you? Let me know in the comment section below!

How much power does a 1000 watt HPS light use

A 1000 watt HPS lamp uses approximately 875 watts of power. The rest is lost as heat energy. The ballast, fan, reflector and cord account for about 150-200 watts of that 875 watts.

A standard wall outlet (120 volt) would need to be able to provide about 13 amps (8 hrs on/16 hrs off)to supply this much power. You may use a higher voltage line to reduce your amperage requirements which will increase your efficiency also.

I recommend using a dedicated circuit with nothing else on it if possible so you do not overload the electrical system in your home or business. If you are unfamiliar with electricity safety practices then contact an electrician before attempting to install electrical wiring or use a power cord that is rated for the currents involved.

Using the proper size wire and circuit breaker will also reduce your chances of overheating or starting a fire.


Why do I need to know this information

If you are growing plants, you will need to know how much electricity is required for the lamp in order to purchase the correct lamp for your size grow room. If you are purchasing LED lighting, please refer to our article on LED plant grow lights .

Where can I find out more about how much power my lights are using

Ideally this information is included in the packaging of your light bulbs. If it isn’t listed on the package (or if you’ve misplaced the information) you can contact the manufacturer directly and ask them for this information.

 Why should I care about the amount of energy that my lights are using

Using fluorescent lighting (tubes, T‐5s) and LED plant grow lights will significantly reduce your electricity consumption over HPS and MH lamps. However, even if you still think traditional HID lighting is for you, there is something to be said for reducing your carbon footprint; by reducing the amount of electricity you require, you will reduce your use of fossil fuels (coal‐fired power plants) and help decrease greenhouse gasses.

What can be done to reduce the amount of energy used by an HPS light bulb

If you are committed to using an HPS light, there are a few things you can do to reduce its energy usage. You can purchase an electronic ballast, instead of a magnetic one; this will be the single most effective step you take in reducing your electricity consumption.

Magnetic ballasts are typically around 86 percent efficient whereas electronic ones tend to run at about 92 percent. Secondly, you should always purchase high‐quality HPS lights.

This will ensure you are using an efficient bulb with a reliable ballast that is going to last as long as possible. If you have made the switch to LED plant grow lights , then the energy consumption of your lighting system is reduced by a very high percentage and there is no need for concern on this topic!

Growers who use HPS grow lights, please feel free to chime in with your thoughts!

How much does it cost to run a 1000 watt light per month

If you are using HPS lights, you need to be aware of two costs- one is the cost of running the lights and the other is the air conditioning system because HPS lights produce a lot of heat.

The cost behind wattage

A watt HPS light can draw upto 1050 watts of actual power.  Here is the formula we are going to use for calculating the monthly cost of running a 1000 watt HPS light.

We need to calculate the KWH of running the lights first per day, per month and per year.

KWH=(Wattage x Hours per day x Number of appliances)1000

Let’s assume you will run a 1000 watt HPS light for 16 hours a day. Like I said earlier, a 1000 watt HPS light can draw upto 1050 watts of actual power. So, I’ll use 1050 for calculating purposes.

KWH=(1050 x  16 x  1)➗1000

           = 16800 ➗1000

         = 16.8 KWH

Now let’s find out how much it costs to run a 1000 watt HPS light per day per month and per year. Keep in mind electricity costs around the US will be different and the KWH cost keeps changing all the time. Contact the local authority for knowing the actual rates.

I will pick Alabama for this case. In Alabama, you will need to pay around 12.41 cents per KWH/ It’s one of the cheapest ones in the US. On the other hand, in Hawaii, it costs more than 30 cents per KWH.

So it costs (16.8 x 0.12)=  $2.016 per day, (2.016 x 30)=$60.48 per month, (60.48 x 12)= $725.76 per year in Alabama to run a 1000 watt HPS light for 16 hours a day.

Air conditioning cost

HPS lights can become really hot. So you need to invest a good amount of money in getting a good quality air conditioning system for your indoor grow setup.

If you don’t use one, the grow room will become too hot and the trees will be burnt. 1 watt of electricity produces 3.412 BTU per hour. I will be running a 1000 watt HPS light (1050 watts of actual power) for 16 hours.

So, your growth setup will produce (1050 * 3.412 * 16)= 57,321.6 BTU per day. You will need around 6 tons of cooling per day. Contact with the cooler manufacturers. They will help you get a realistic cost expectation. Now, add the cost of running the cooling system with the cost of running the lights.

Final Words

HPS lights are really effective but they are not the most energy efficient ones. As they produce a lot of heat, you need to invest a lot of money behind air conditioning as well. You need to be extra careful while using these lights.

I don’t really use HPS lights so I don’t recommend them personally. But if you do, make sure you have a good amount of investment.

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