How Many Plants Can I Grow per 1000 Watt Light?

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Last Updated on February 27, 2023

When starting out growing various plants indoors, different questions may pop into your mind. Questions such as “how many plants can I grow per 1000 watt light?”.

Every grower wants to maximize their yield after all the hard work they put into their indoor garden. Providing your indoor plants with light is very essential for their development. High-pressure sodium (HPS) lights have been in existence for almost 50 years, and are some of the most widely used grow lights. They have been providing light energy for indoor plants growing needs.

Now, you must get the right plant coverage for the particular bulb wattage you have. This is why we are going to be looking at how many plants you can grow per 1000 watt light. We will also be looking at other grow light plant coverage for 1000w. So, read on to find out.

How Many Plants for an a1000-Wattt HPS?

The light wattage will decide how much area or the coverage area you can light up. So, for how many plants for a 1000 watt HPS bulb? The answer should be around 5 by 5-foot or 25 square feet.

Even though everyone has their methods, it all boils down to what method works for you. Some growers have boasted of growing about 6 to 9 plants using 1000-watt HPS. Some even grow smaller plants while using the SCROG and SOG techniques to manage space.

How Many Plants For A 1000 Watt HPS - Scrog and Sog

How Many Plants per 1000 Watt Light?

Various grow lights will have a coverage capacity depending on their wattage. Let’s take a look at some 1000-watt to grow lights and their plants’ coverage capacity:

·         1000 watt LED grow light plant coverage capacity

A 1000-watt LED grows light plant coverage capacity will also be around 5 by 5 feet or 25 square feet area. You should also take note of the quality of the LED to-grow light you’re using as some lights are more efficient than others. Different brands will offer different benefits to your plants.

Another important thing to understand is what is actually meant by a 1000-watt LED. The meaning of a 1000-watt LED is referred to as the equivalent of a 1000-watt HID light. The only difference is that this LED light consumes less than 1000 watts of light.

We have what we call LED actual wattage and labeled wattage. The labeled wattage of the LED growth light is written in bold words by the manufacturer. The actual wattage is the actual amount of power the LED light draws and it’s not usually up to the labeled value.

SPIDER FARMER SF-1000 LED Grow Light Use with Samsung LM301B LEDs

For instance, a 1000-watt LED grows light actually wattage maybe around 500 to 700 watts but will give you an output that almost equals a 1000-watt HID. You can find the actual LED wattage value if you dig through the manufacturer’s manual.

Thus, this shows that LED grgrowthights are more efficient by offering you more benefits while saving you power consumption. So, the coverage area of LED actual wattage of 500 to 700 will also be a 5 by 5-foot area.

·         1000 watts for other HID grow light plant coverage

We have looked at how many plants for a 1000 watt HPS will be. So, let’s discuss other 1000 watt HID bulb plant coverage (such as CMH and MH).

The difference between HID light coverage and LED light coverage is not so much. 1000 HID watt coverage offers roughly a close range of coverage area the only difference is the HID reflector used.

Umbrella reflectors for instance will offer you a big light coverage area. However, the light intensity will not be so great. Other focused reflectors such as a hood will offer you a smaller coverage area with more light intensity.

1000 Watts For Other HID Grow Light Plant Coverage

Taking a look at the types of HID bulbs we have, here is their plant coverage capacity:

Ceramic Metal Halide (CMH): even though 1000-watt CMH bulbs may be scarce (the common watt seen is 315w), the ones that are actually 1000 watts will have plant coverage of about 5 by 5 feet area.

Metal Halide (MH): for a metal halide bulb, the plant coverage is about 7 by 7 area feet for vegetative growth. While for the flowering phase, the coverage area is about 5 by 5 feet. However, we recommend not using a metal halide bulb for the flowering phase. You should rather use HPS grow light if you want big buds and yields.

How Many Plants per Light: Factors to Consider

Now, talking generally about the number of plants to be grown per grow light, we would say 1 to 8 plants. Make sure you don’t grow more than this number so you don’t limit your yields.

Following the right number of plants to grow per plant will give your plants a good chance to flourish thereby resulting in good yields. However, if you grow more than 8 plants using a single grow light, your plants won’t receive adequate light and space to grow.

Here are other factors to consider when deciding how many plants to be used using each grow light:

Power of grow light

You should also note that the power of your grow light will also be another determinant of how many plants you can grow using that light.

Condition of grow space

Another factor to consider when deciding how many plants to grow per light is the condition of your grow space. If your grow space already a bit receives natural light, then a not-so-strong grow light will be fine. You can even place your grow light higher to increase the coverage area.

Plant growth stage

The stage your plant is in will also have a determining fafactor inour choice of grow light.  Some flowering plants require high light intensity, thus, a 5 by 5 feet coverage area should be ideal for 1000 watt light. On the other hand, vegetative plants such as lettuce can allow you to hang your light higher for larger coverage. You can use a coverage area of 7 by 7 feet for plants in their vegetative stage of growth.

1000 Watt HPS Grow Light Coverage

HPS grow lights are ideal for use in grow tents, large grow rooms, and greenhouses. 1000-watt HPS grow lights are the most powerful grow lights and have a wide coverage area of up to 49 square feet.

A 1000-watt HPS grow will effectively cover a growing area of 36 square feet. The difference between the maximum coverage area and effective coverage area is dependent on the depth and height of the plants you are growing. The denser the plants, the lower the coverage area your grow light will have.

Unlike other grow lights such as LED, HPS grow lights generate heat. So regardless of the growing area you are using the lights on, they must be mounted farther from the plants to avoid burning them.

Depending on the plants you are growing, you can mount an HPS grow light anywhere between 6 to 24 inches from the plant canopy. Make sure you do sufficient research on your plants so that you can create the ideal growing conditions for them and not burn them with grow lights. You will also need to set up an efficient ventilation system to help keep the humidity conditions right.

 To even further improve your plant growth potential, you can set up your HPS grow lights with timers and light rails. The timers will help you keep the plants in a consistent light schedule. The lights will turn on and off at the same time every day. Light rails will help you to move the light fixtures along rows to ensure that all the plants get an equal amount of light in the entire growing area.

To get the best efficiency out of HPS grow lights, they should be replaced every 14 months.

LED Equivalent to 1000 Watt HPS

LED lights can be used in place of HPS. Due to the difference in the designs of these lights, however, there will be differences in the wattage replacements of these two lights.

LEDs are designed to have a lower energy consumption compared to HPS. Because of this, LEDs will have a lower wattage.

If you are looking for an LED equivalent to 1000-watt HPS, a 300-Watt LED High Bay is a good choice. Or you can replace a 1000-Watt Metal Halide Shoebox with a 300-Watt LED Shoebox. They can deliver the right amount of light required, last longer, and have reduced energy consumption.

Because of the differences in the equivalencies, it may not be best to base your decision on grow light wattage. Instead, you can use the number of lumens your plants need. Once you understand that, it becomes easy to find a replacement.

LED Equivalent to 1000 Watt

1000w DE HPS Distance From Plants

The distance at which you should place the grow light from the plants depends on the strength or intensity of the light. The stronger the light, the further you will need to hang them from the plants.

Because a 1000W DE HPS is quite a strong light, you should hang it at least 15 inches away. And if it is even stronger, place it further away but do not go farther than 30 inches. If you place the lights too far above the plants, they will love vitality.

A 1000w light produces a lot of light so you will need to err on the side of caution with this one. If your plants are starting to burn, you will notice the leaves starting to bleach. Some strains of plants will bleach easier or faster than others. So place your grow lights at an appropriate distance from your canopy to avoid heat stress. If you are using this light in a grow tent or a well-reflective light, you will not have much of a problem with this

Conclusion – How Many Plants Can I Grow per 1000 Watt Light?

Now, we have answered the question “how many plants can I grow per 1000 watt light?”, you should be well on your way to comfortable and confidently purchasing the best grow lights for your plants. Keep all considerations such as the density of the plants, grow light area, the distance between plants and light, and the height of your plants when purchasing a grow light. This way you will be guaranteed to get the best out of your grow lights while avoiding issues such as leaf burn.

So, we hope this post has been able to enlighten you on deciding your plant grow light coverage.


How much area does a 1000 Watt HPS cover?

It isn't set in stone, but the amount that it covers is thought to be around 49 square feet.

The best way to calculate how much area you will be heating with a HPS is by looking at the Watts. The power rating of your HPS (1000W) is divided by the number of hours in a day and the number of days in a year. If you are heating with a HPS for 24 hours a day 365 days a year, the area you are covering is about 1.5 acres.

The more you put distance between the light and the walls and ceiling the less wasted energy you will have.

How many plants can I grow with 1000 Watt HPS?

The answer is that it depends on how much light you are using, how much space you have and what your plants require. For instance, let’s say you have a 10′ x 20′ growing area. If you only use 4″ of light, you can grow about 15 plants.

This means you would need 2 bulbs to cover this area. But if you were to use 8″ of light, you could grow 50+ plants in this space. So, you could easily grow up to 200 plants with 8″ of light and a 1000 watt HPS bulb. Let’s take this one step further. Say you have a 2000 watt HPS, you could grow 500+ plants in this space. So the bottom line is you can grow just as many plants with a 1000 watt HPS as you can with a 2000 watt HPS.

So, it gets a bit tricky. The first thing you need to determine is how much light you will need. The number of plants you can grow will depend on the amount of light you have available.

How far should 1000 Watt HPS be from plants?

You should be at least one meter away. But, if you want to go further, go ahead.

What LED is equivalent to a 1000w HPS?

Black Dog PhytoMAX-2 could be easily considered an equivalent. The only issue is thet they are very expensive, and for this reason very few people go for them.

How much does it cost to run 1000 watt HPS?

You can get a 1000Watt HPS for $0.90/hour. However, you will need to do some research to find the right model and wattage, as well as getting a supply voltage of around 110V. I would recommend finding a manufacturer like Noctua or CLC or XSPC that makes HPS units for your particular requirements and then order online.

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