How Much Weed Can A 1000 Watt Light Produce?

When starting out growing weed, you’ll have a lot of questions about grow lights.

Everyone wants to know how much bud they’re going to have in their hands after all their hard work, so a common question is “how much weed can a 1000 watt light produce?”

I’m going to do my best to answer it in this article.

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How Much Weed Can A 1000 Watt Light Produce?

Short answer: Sadly, there is no simple answer to this question. The yield you get from a plant under a 1000w grow light will vary based on a variety of factors such as your skill level, experience, the strain, growing techniques, and the quality of light you’re using.

However, if you’re looking for a rough idea using wattage, you can estimate 0.5 to 1 grams per watt, with 0.5 grams being considered a good yield, and 1 gram per watt would be considered an excellent yield. Therefore, under a 1000w watt, you can expect to get between 500 – 1000 grams ( or 17 – 35 ounces )

However, these yields will be hard to achieve without the right growing conditions.

Factors That Will Affect Your Yield

Although I’ve provided you with a rough idea of how much weed you can expect per watt from your 1000w grow light, It’s important to keep in mind that lighting can only do so much.  There are many factors that are important in determining the yield you get. Let’s take a look at the most important ones.

Skills & Experience of Grower

Following a good growing guide will help, but ultimately the experience and skills of the grower will have a big effect on the yield you get under a 1000w grow light. Just like driving, you can learn all the theory you like, but you won’t start properly learning until you get in the car. Growers who have been through a few harvests will generally produce more weed as they will have refined their timings and techniques.


Lighting is essential to producing a high highest possible yield. If you want a higher than average yield, it’s important that you choose a good quality grow light.

For maximum yields, choose a grow light that outputs a high amount of PAR ( Photosynthetic Active Radiation ) which are the light wavelengths that your plant actually uses to grow. Most good grow light manufacturers provide a chart with the PAR values at various heights. here’s what you should look for:

Vegetative stage – PAR value of 400-600 at 24″
Flowering stage – PAR value of 600 – 700 at 18″

In general, lights with higher wattage should have higher PAR, but that’s not always true.  You can buy an inexpensive 1000 watt HPS that actually has a LOWER PAR value than a high-quality 600w LED.  When shopping for a grow light, it’s more important to know the PAR value than wattage.. if a manufacturer doesn’t disclose the PAR information for their light, reach out and ask!


If you’re looking for large yields, you’ll want to choose a strain known for its large yield genetics.

It’s a good idea to avoid auto flower strains if you’re hoping for large yields.  Auto-flowers usually produce smaller yields than Indica or Sativa strains due to the fact they are mixed with nonflowering Ruderalis strains for their auto-flowering qualities.

Grow Space

Your grow space will have a big impact on your yields. To improve your yields, make sure your grow space has the following:

  • No light leaks
  • Plenty of space for your plant to grow into.
  • Mylar reflective surfaces
  • Good air circulation
  • Correct temperature

To ensure your plant is grown in the perfect conditions, you should invest in solid marijuana grow tent.


Low-Stress Training

Low-Stress Training, or LST, is a tool that many new growers don’t know about, but it’s an excellent way to increase your plant’s yields.  Essentially, LST is like an exercise program for your plant… it helps increase the ability for the plant to grow more buds.

There are a few kinds of LST, some of which are more complex than others. Topping can increase your yields by up to 150%, while scrogging or manifolding can double your plant’s yield.

It should be noted, however, that any kind of training places stress on a plant and can have negative results if done incorrectly. Growers who plan to use these tools should research thoroughly and be prepared for setbacks while they learn the techniques.


In general, a light with higher wattage should produce a higher PAR value and, therefore, a better yield.  A 1000 watt light, on average, will produce more than its 500-watt counterpart.  As a basic rule of thumb, you can use the tried-and-true baseline of .5 to 1 gram per watt of light.

However, “how much weed can a 1000 watt light produce?” is really the wrong question to be asking. There are far better ways to maximize your yields and many other variables that should be considered.  If you’re looking to ensure that you get the most bud for your buck, we recommend considering all aspects of your growth… including your grow space, lighting, container, and training methods.

What do you think? Have any tips or tricks that have worked to increase your yields?  If so, let us know in the comments… and, as always, thanks for reading!

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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8 thoughts on “How Much Weed Can A 1000 Watt Light Produce?”

  1. Hi James trust you well

    I’m growing in a 4by4 tent with 25w extracterfan in and 25w extracterfan out,Inside I’m using a 1000w led full spectrum and a 20w normal fan.Planing to grow 4 plants under that.any suggestions? You think is fine to go ahead?

    Regards Carlo

  2. I grow aeroponically with a PD 1060 system. I use mixed bulbs. 5 MH and 5 HPS for a total of 10 lights. My system has 160 3″ grow spaces averaging 6oz per sight. That puts my yield at 6lbs per light. Now that is way above the pseudo norm figures most websites or grow guides will tell you is possible. If your a doubter like 99.9% of the growers i talk to, I invite you to come see for yourself. Sincerely justin johnson and the

    • Justin whats up Tim here from hillbilly land eastern KY. Im also using a 1000 watt mh for veg and 1000 watt hps for flower, now u sound like a seasoned grower so I have to have your opinion my friend, ok this is only my 2nd grow I have 8 plants in dwc as well as 5 in soil this by the way is my 1st time in hydro and its not going well at all 4 have been in there for 3 or 4 weeks and just now starting to show some growth. Ppm at 350 and ph at 5.5-5.6 and still they burn I dont get it. I actually had 8 previously 4 grandaddy banners and 4 white widows out of that 8 I only have 4 left 2 of each then another white widow died so I replaced with a lemon haze the same age in wich all have constantly struggling and just now the 2 banners are starting to improve slightly . the other buckets I ordered 4 cafe racers and 7 white widow autos they are only a week old and look great so far i put 2 of each in the dwc buckets that were left behind from those dying b4 ther ph is 6.0 and ppm 180. Hopefully I figure this situation out but my question for you is actually about the lights. Ok. I have a 5×5 room with 1 1000 watt mh and another room that is 4×4 that is not being used as well as 1 light so wich would be better open the rooms to were they are 1 put the other light beside the one on and just grow that whole area full of plant or leave it the way it is and have a veg room and flower room for a continuous cycle. I will figure the dwc thing out like any other thing experience is key

  3. Hi guys could you help me with some things to maximise my yield I have 1x 1000w light in a 1.5×1.5×2.0 metre tent and have 2 x filters extracting air and a 5 inch rvk fan bringing air in plus a small fan to cook the light I have 9 plants in 25 litre pots using advanced nutrients and also using good strain seeds from markets farm there’s
    OG cookies x1
    Peyote cookies x1
    Train wreck x2
    Green crack x2
    LSD x1
    Jack x1 the biggest is the OG cookies at 2.5 feet or 27 Inches at the start of week 1 and smallest being the train wreck at 1.5 feet however one of them is also 2.0 feet the OG cookies looks the bushiest as well so I think my next crop will just be 2 strains 1 being the cookies and I will need to wait and see how they go first I have topped them all once and one of the train wreck topped twice and I’ve been low stress training them to bush out as well but that’s the tent full already I have space for them to reach 4 feet then I will need to grow it downwards if they still have more time before the reach 4 feet

  4. hey ppl I’m a first timer I got a fair idea but I need some pointers especially crucial ones …got three clones coming lol where do I start ill go get it all and prep up… contact me thru my email cheers, happy growing

  5. I’m on my first grow and a friend of mine told me to start growing indoors in the middle of the summer! He also make it from seed and photoperiod non feminized. All of that making it just about as hard as it gets to come up with a successful yield. But it has taught me so much. I’m in my fifth week of flower on my first run and they are doing great! But it did suck you wouldn’t believe how hard it is to keep the humidity and heat down. But I managed to do it and I would say I have about a pound or so to harvest in about five weeks


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