How Much Weed Can A 1000 Watt Light Produce

Whether you have been growing weeds for years or you are new to it, the one question that most weed growers worry about is how much weed can a 1000 watt light produce. While this might appear an easy to answer question, it is actually pretty complicated as the yield depends on various other factors. When all the factors are favorable, a pound weed per plant is possible.

As the demand for weed grows for personal use and medical needs, many people are turning to growing weeds as a lucrative way to earn some extra money. When it comes to indoor weed cultivation, the yield per plant is important.

In this article we will look at the various factors that help in maximizing yield and also find out how much weed can a 1000 watt light produce.

Before we get into the facts and numbers, let’s get a brief background of weed cultivation indoors. When growing weed indoors, it is important for the grower to replicate the same outdoor growing environment inside the house.

Light plays an important role in the growth of weeds. In the absence of sunlight, you need to ensure that you provide a good alternative for sunlight. Light is essential for photosynthesis, which is an important process in plant growth.

If you are a new grower just starting off with this style of cultivation, you may not get the maximum yield. As you gain more experience and get better at growing weeds, you may expect the plants to give you a gram of weed per watt. So this means one gram, which is equal to 0,035 oz.

Maximum Yield for 1000 Watt

When an experienced weed grower uses 400 watts HPS grow light under favorable circumstances, he can get a produce of 400 grams. If you need more yield, you will need more light. When using more light make sure that the space is also bigger. If you use more light in small and compact space it will generate a lot of heat causing the plants to burn. You will need to install exhaust fans to vent out the heat, adding up to your cultivation cost.

While it is essential that you get the right type of light, you will also need the right nutrients, good space, clean air and the right equipment. You will also need to spend time dedicatedly and take good care of the plants to ensure that you get the highest yield possible. You must ensure that there is enough growing space and there’s a good gap between plants and the lights.

When using a 1000-watt HPS lamp in a growing space that measures about 5 x 5 x 8 feet, you can expect a maximum yield of 9.0 to 18 oz.

When using a 1000-watt HPS lamp in a growing space measuring 1.5 x 1.5 x 2.5 m, you can expect a maximum yield of 250 to 500 grams

What is the Maximum Yield per Plant?

When cultivating indoors, you will often realize that the measurements above are not always true. This is mainly because indoor weed growth is impacted by several factors which highly influence the yield. Light plays the most important role in determining the yield per plant.

As a general rule, it is seen that growers get a better yield when there are less number of plants per lamp. The ideal number is to use four plants for one light. When you want to have more yields per plant, here are a few important things that you need to consider.

The vegetative growth usually last longer when there are just four plants. When tips of the leaves are touching, you will want to force flowering stage. When there are more plants then the leaves tend to touch more quickly. If one of the plants is ruined or it contacts a disease, the entire crop will be impacted.

It is much easier to manage four plants than sixteen at a time. Several states have different rules regarding weed cultivation so you want to ensure that you stay within the legal limits. If you do not want the government officials to penalize you for your secret grow room, make sure you have a small number of four plants than a large cultivation space.

How can you increase your yield?

Whether you use a 600 watt light, 1000 watt light or even more, there are techniques that can help you maximize the yield per crop. The Screen of Green (SCROG) technique is one such method that helps in maximizing the yield. The main idea behind this technique is to place a filter screen about 15 inches above plants. When the plant grows four inches through the filter, tie it horizontally on the screen. Keep adding all the branches in the similar fashion until it creates a blanket.

The screen of green technique helps in maximizing the yield as no light is wasted in this method. The thick blanket you create on the top prevents any light from being wasted hence all energy is directly absorbed by the leaves.

In this method all plants are of the same height, hence each one receives equal amount of light. None of the branches stay in shade so you get the maximum yield. The branches at the bottom are pruned, so energy is not wasted in forcefully developing the soft and fluffy buds that don’t stand a chance to ripen.


A 1000 watt bulb will definitely produce more yield as it provides more light and heat. However, to produce more yield, only more light is not enough. You also need more than 350-400 ppm of CO2 in the air to use that extra amount of light in the process of photosynthesis. You may use advanced techniques or invest in LED light bulbs to reduce your investment and increase the yield. With the right kind of equipment and favorable environment, you can maximize the production of weed. When there’s more light involved, it also tends to increase heat, so make sure you have proper arrangements to vent off the extra heat.

Leave a Comment